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Publication numberUS3312794 A
Publication typeGrant
Publication dateApr 4, 1967
Filing dateNov 15, 1963
Priority dateNov 15, 1963
Publication numberUS 3312794 A, US 3312794A, US-A-3312794, US3312794 A, US3312794A
InventorsJoseph S Hollyday
Original AssigneeHeinemann Electric Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Circuit breaker handle with transversely slidable restraining means
US 3312794 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

Apt-114, 1967 J, s. HOLLYDAY v CIRCUIT BREAKER HANDLER WITH TRANSVERSELY SLIDABLE RESTRAINING MEANS 2 Sheets-Sheet 1 Filed NOV. 15, 1965 Iblllllllll INVENTOR. Jam-PH J? #014 V04) BY Apnl 4, 1967 J. 5. HOLLYDAY 3,312,794

CIRCUIT BREAKER HANDLER WITH TRANSVERSELY SLIDABLE RESTRAINING MEANS Filed Nov. 15, 1965 2 Sheets-Sheet 2 INVENTOR JOSEP/l J. HOLD 0,4)

3 312,794 cmcurr BREAKER HANDLE WITH TRANS- VERSELY SLIDABLE RESTRAINING MEANS Joseph S. Hollyday, Pennington, N.J., assignor to Heinemann Electric Company, Trenton, N.J., a corporation of New Jersey I Filed Nov. 15, 1963, Ser. No. 324,128 16 Claims. (Cl. 200-42) This invention relates to a restraining device for a circuit breaker handle and it is an object of this invention to provide an improved device for restraining the movement of the circuit breaker handle when such restraint is desired.

Also, this invention relates to a device associated with the handle of a circuit breaker which extends through the cover of the box enclosing the circuit breaker case, and it is another object of this invention to provide an improved device which relates the restraint on the handle with the opening of the box cover.

When circuit breakers are mounted inside enclosing boxes, with the circuit breaker handles extending through the boxes, it is sometimes desired to provide a device for preventing the unauthorized manipulation of the handle. Also, it is sometimes desired to provide an additional safety feature tending to prevent injury to persons and equipment by preventing the opening. of the box cover unless the circuit breaker handle is in the off position.

The device provided by this invention may be mounted on the circuit breaker case and used only to restrain movement of the handle from the On or off positions, as desired. When the circuit breaker is enclosed by a box, with the handle extending therethrongh and the device provided by this invention is added, to a modified box cover, the latter is also restrained against opening, unless the device is in the off position of the circuit breaker.

In my invention, there is provided a bracket securable to the circuit breaker case and a slide movable to three positions along the bracket, In the first slide position the handle is not restrained, in the second slide position the handle is restrained in the on position or the ofl? position, and in the third slide position the handle is restrained in the off position. 'The box cover, in combination with the restraining device, may be opened only when the slide is in the third position, i.e., only the off position of the circuit breaker. Further, the slide and bracket may be tied together to maintain the slide in-any one of its three positions.

Where the circuit breaker is enclosed in a box and the handle extends through the opening of the box, the box cover is modified so as to provide a latch which is re strained by the slide to prevent opening of the box cover, if the circuit breaker handle is not in the off position. Thus, the box cover may be removed only when the circuit breaker handle is in its off position, thereby tending to insure the safety of persons who may be working on the protected circuit and the safety of the equipment in the protected circuit.

The foregoing and other objects of my invention, the principles of my invention, and the best mode in which I have contemplated applying such principles will more fully appear from the following description and accompanying drawings in illustration thereof.

In the drawings,

FIG. 1 is a top view of the enclosing box and the circuit breaker handle restraining device of this invention, the box being partly cut away and the slide being shown in its first position wherein the circuit breaker handle is not restrained but opening of the box cover is prevented;

FIG. 2 is a partial sectional View taken along the line 2-2 in FIG. 1 and showing the circuit breaker in side elevation;

""Ilnited States Patent FIG. 3 is a view taken along the line 3-3 in FIG. 2, but partially showing the circuit breaker in front elevation;

FIG. 4 is a partial sectional view taken along the line 4-4 in FIG. 3;

FIG. 5 is an exploded perspective view illustrating a portion of the box cover, the bracket and the slide;

FIG. 6 is a view similar to FIG. 1 but illustrating the slide in its second position wherein the circuit breaker handle is restrained in the on position and opening of the box cover is prevented;

FIG. 7 is a view taken along the line 7-7 in FIG. 6, and mostly in front elevation;

FIG. 8 is a view similar to FIG. 6 but showing the third position of the slide wherein the circuit breaker handle is restrained in its ofi? position and the box cover is free to open; and

FIG. 9 is a view taken along the line 9-9 in FIG. 8, and mostly in front elevation.

I Referring to the drawings and in particular to FIGS. 1, 2 and 3, there is illustrated a multipole circuit breaker 10 having a case 11 of molded insulation enclosed by a box 14, the circuit breaker 10 including a movable handle 16 extending through an opening 20 in a depressed section 21 of the cover 22 forming a part of the box 14, the handle 16 not extending beyond the depressed section 21, as illustrated in FIG. 2.

The circuit breaker is secured to the base section 23 of the box 14 by screws which extend through the circuit breaker case 11, through openings in the back 24 of the base, and into the threaded openings of nuts 27 welded to the back 24. The back wall 24 is also provided with suitable lugs 28 and holes or slots for mounting the box on an external board or other support means, not illustrated. Further, the four side walls 26 and the back wall 24 have suitable removable sections, commonly called knock outs, so that cables may be inserted into the interior of the box and connected to the circuit breaker.

The cover 22 has peripheral depending flanges 30 overlapping parts of the side walls 26. The left hand flange (FIG. 1) has two pins 32 welded to it and the pins 32 extend through suitable openings slightly larger than the pin shanks in the left hand side wall, and at the opposite end of the box two suitable screws 33 secure the cover 22 to the base 23.

The restrainer or restraining device 40 provided by this invention comprises a bracket 42 secured to the top of the circuit breaker casing. The bracket 42 comprises a substantially flat plate 43 seated against the upper portion of the circuit breaker case 11 by a depending flange 44 following the contour of the circuit breaker case 11 and which is secured to the circuit breaker case by suitable screws 45 whose heads are in spaced relation to the lowest overlying part of the cover section 21. The plate 43 is formed with a large generally rectangular opening 46 through which the circuit breaker handle 16 and its surrounding raised case portion 48 extend and, at opposite sides of the plate 43, upstanding arms 50 are bent at right angles to the plate 43. The upstanding arms 50 and margins of the plate 43 are cut out to form elongated openings 52.

Disposed primarily between the two upstanding arms 50 is a holder or slide 54 movable back and forth to three positions. The slide 54 comprises a flat body 46 with.

a [central tongue 58 and two recesses 60 and 61 on opposite sides of the tongue, the recess 60 being longer than the recess 61. On opposite sides of the slide 54, tabs 64 are bent up at a right angle to the body 56 and the tabs 64 are located intermediate the upstanding arms 50. Projecting downwardly and outwardly from the forward portions of the tabs are members 67 having feet I 68, the feet 68 entering elongated grooves 70 defined by the loweredge portions of the arms 56 and an upper surface portion of the circuit breaker case 11, the members 67 being long enough to raise the slide body 56 above the latch 75 when the slide 54 moves to its first or second positions, FIG. 1 or 6.

The path of movement of the slide 54 back and forth is thus determined by the bracket 42 and this path is limited by engagement of the feet 68 with the end portions 66 of the arms 50 partially defining the elongated openings 52, FIG. 5. Further, movement downwardly as viewed in FIG. 4, for instance, is limited by abutment of the feet 68 on the surface of the case 11, while upward movement of the slide 54 is limited by the lengthwise edges 69 of the arms 50, FIGS. 4 and 5.

The depressed section 21 of the cover 22 overlies: the plate 43 and is formed with a latch 75, disposed perpendicular to the pins 32, which projects into the opening 46 toward the circuit breaker handle 16 between the arms 50, but the latch 75 is spaced from the cover edge portions defining the opening 46 by slots 77 into which are received portions of the arms 50, the latch side edges being also spaced from the adjacent portions of the arms 64 when the slide is in its first and second positions, FIGS. 1 and 6, due to the slots.

As illustrated in FIGS. 5, 7 and 9, the two arms 50 are each provided with two holes 86 and 81 and the two tabs 64 are each provided with three holes 86, 87 and 88.

Referring to FIGS. 1 to 4 which illustrate the first position of the slide 54, the latch 75 is trapped between the plate 43 and the slide 54, the slide 54 being in the position where the holes 80 and 87 and holes 81 and 88 are aligned and may receive the shackle or hasp of a padlock 90. It is noted that at this time the tongue 58 extends toward the circuit breaker handle opening but ends just short thereof.

With the slide 54 in its first position the circuit breaker handle may be pivotally moved between its two positions, i.e., between its on and off positions, but the cover 22 cannot be removed from the base section 23, even if the screws 33 are removed, because the latch 75 is trapped between the plate 42 and the slide 54.

After the padlock 90 is opened and the hasp removed from the openings 80 and 87, the slide 54 may be moved along the bracket until the holes 80 and 86 and holes 81 and 87 come into alignment, this being the second position of the slide 54 and is illustrated in FIGS. 6 and 7. At such time, assuming the circuit breaker handle to be in its on position before such movement of the slide 54, as illustrated in FIG. 6, the tongue 58 will restrain and prevent the handle 16 from being turned to its off position. At the same time removal of the cover 22 is prevented because the slide still overlies the latch 75, as illustrated in FIGS. 6 and 7.

Thus, it is seen that if prior to moving'the slide from the first position (of FIG. 1) to the second position (of FIG. 6) the handle 16 is turned to the off position, the handle will be restrained from movement away [from the off position after the slide 54 is moved to its second position because the handle 16 will be, referring to FIG. 6, on the right of the tongue 58, and extending through the longer recess 60.

The slide 54 may be moved to its third position in which the holes 81 and 86 are aligned. At this time, however, to permit movement of the slide 54 to such position the handle '16 must be in its off position as the shoulder 95 defining the smaller recess 61 will engage the handle 16 and prevent movement of the slide to the third position if the circuit breaker handle is in the on position. If the handle 16 is first moved to the off position and then the slide 54 is moved to its third position, no part of the slide 54 overlies any part of the cover 22 and consequently the latch 75 is not restrained by the slide 54.

With the slide 54 in the third position, the screws 33 (which are threaded into the base 23) may be removed and the cover 22 lifted from the base 23. The righthand end of the cover 22 is lifted and pivoted up (FIGS. 8 and 9) about the pins 32 (the holes in the left side wall 26 for these pins being large enough to permit such pivoting movement) until the upper left-hand edge (adjacent to the left-hand slot 77) of the latch 75 just clears the upper edge of the left-hand upstanding arm 50 of the bracket 42. The flange 30 is made narrow enough, relative to the height of the arms 50 and tabs 64, so that once the aforementioned pivoting has taken place the right-hand flange 3d of the cover 22 will clear the right-hand side wall 26 of the base 23. At the same time the upper right-hand edge partially defining the righthand slot 77 in the cover 22 will clear the upper edge of the right-hand upstanding arm 50 of the bracket 42 and the right-hand tab 64 of the slide 54. Thereafter, the cover 22 is slid to the left until the pins 32 are free of the holes in the left-hand wall 26 of the base 23 at which time the cover 22 may be removed completely from the base 23. It should be noted that when the slide 54 is in th first or second position where the flat body 56 overlies the latch 75, the cover 22 cannot be pivoted about the pins nor can it be slide a suflicient distance in any direction to slide the latch 75 from under the fiat body 56 of the slide 54 because the flanges 30 will engage on the side walls 26 of the base 23. Further restraint is also offered by interference between the edges of the opening 26 in the cover 22 with the upstanding edges 50 of bracket 42.

The fiat surface of the depressed cover section 21 surrounding the opening 20 in the cover is pressed firmly against the corresponding part of the flat plate 43 surrounding the opening 46, thus sealing against the escape of hot gases and particles which may be created during arc extinction, these hot gases and particles remaining trapped within the 'box 14, tending not to injure the persons hand which may be operating the circuit breaker handle. 7

It will be noted that the tongue 58 has two elangated openings 94, and as illustrated in FIGS. 6 and 8 the on and off handle markings may be seen through them.

Further, as illustrated in FIGS. 2, 3, 7 :and 9 the tabs 64 and arm-s 50 do not extend beyond the depressed section 21 of the cover 22 and preferably the padlock 9t) lies within the depressed section 21. Thus, no part of the restraining device 44) or the padlock 96 projects beyond the cover 22 which tends to protect persons and equipment moving by the box 14 from engaging the restraining device or padlock and also protects them from being struck and damaged by trucks moving by the box 14.

It is seen that the screws 45 securing flat plate, 43 to the circuit breaker case 11 are hidden by the cover 22 after the latter is assembled to the base section 23, tending to minimize tampering with the restraining device 40.

Also, the restraining device 40 has been illustrated in combination with a cover 22 modified to provide a latch 75 so that opening and closing of the cover is related to the position of the slide 54 relative to the latch 75, but it is seen that if this feature is not desired the opening in the cover can be made larger by omitting the latch 75, in which event opening and closing of the so changed cover would be independent of whether or not the circuit breaker handle is restrained in the off position.

It is further seen that in the position of FIGS. 1 and 6 four sets of holes in the slide 54 and the bracket 42 come into alignment and this is to permit locking by four different padlocks. This provision is made so that four different crews working on a protected circuit may each independently padlock the circuit breaker in the off position tending to assure each crew that the protected circuit will not be energized without their knowledge.

The arms 50 and the tabs 64 are also provided with smaller holes 100 between the larger holes, as illustrated. These smaller holes may receive locking wire seals where such sealing is desired in addition to the padlocks or in place of the padlocks.

The circuit breaker with which this invention has been disclosed herein is of the type illustrated and disclosed in greater detail in Patent No. 3,193,643, and is of the electromagnetic trip free type in which movement of the handle to the on position closes the internal contacts, movement of the handle to the OE position opens the internal contacts and if the handle is restrained in its on position while a predetermined overload energizes the circuit breaker coil, or on short circuit, the contacts automatically move to the open position and after the restraint is removed from the handle, it moves to its oiT position.

While a multipole circuit breaker has been illustrated in the drawings it will be understood that this invention is equally applicable to a single pole circuit breaker.

Having described this invention, I claim:

1. In combination, a circuit breaker including a case, a box enclosing the circuit breaker case, said box including a cover, a bracket secured to the circuit breaker case, said cover defining a hole through which a part of said bracket extends, said circuit breaker including a handle movable between oil? and on positions and extending through the hole in said cover, a slide interfitting with said bracket whereby said slide is movable along said bracket to three positions, said slide having a tongue separating two recesses one of which is larger than the other to permit greater transverse movement of said slide across said handle when said handle extends through the larger recess than when it extends through the smaller recess, said cover having a portion lying below said slide, said slide in its first position overlying said cover portion and said tongue being out of the path of movement of said handle, said slide in its second position overlying said cover portion and said tongue being across the path of movement of said handle to restrain said handle from movement away from its on position, said slide in said third position not overlying said cover portion and said tongue being across the path of movement of said handle to restrain movement of said handle away from the OE position, said handle extending through said larger recess when said slide is in said third position and through the smaller recess when said slide is in the second corresponding to the three positions; of said slide for receiving means to lock or seal said slide relative tosaid bracket.

2. In combination, a circuit breaker including a case, a box enclosing the circuit breaker case, said box including a cover, a bracket secured to the circuit breaker case, said cover defining a hole through which a part of the bracket extends, said circuit breaker including a handle movable between first and second positions and extending through the hole in said cover, a slide, means for mounting said slide on said case whereby said slide is movable along said bracket between three positions, said slide having a central tongue movable into and out of restraining relationship with said handle and recesses on opposite sides of said tongue, one of the recesses being longer than the other to permit greater transverse movement of said slide across said handle when said handle .position said slide is out of restraining engagement with 6 said handle, said handle being in its first position and extending'through said longer recess when said slide is in its third position in which position said slide does not overlie said cover portion.

3; In combination, a circuit breaker including a case, a box enclosing the circuit breaker case, said box including a cover, a bracket secured to the circuit breaker case, said cover defining a hole through which a part of the bracket extends, said circuit breaker including a handle movable between off and on positions and extending through the hole in said cover, a slide having feet portions keyed to said bracket whereby said slide is movable along said bracket between three positions, said slide having a central tongue to restrain movement of said handle and recesses on opposite sides of said tongue, one of said recesses being longer than the other to permit greater transverse movement of said slide across said handle when said handle extends through said longer recess than when said handle extends through the other recess, said cover having a latch restrained by said slide when said slide is in two of said three positions, whereby when said slide latches said cover portion in one position, said tongue restrains said handle from movement away from said on or off handle position and when said slide latches said cover portion in the other position said slide is out of restraining engagement with said handle, said han dle being in the off position and extending through said longer recess when said slide is in its third position in which it does not latch said cover portion, and said slide and bracket having holes corresponding to the three positions of said slide to receive the hasp of a lock to lock said slide relative to said bracket.

4. In combination, a circuit breaker including a case, a handle extending from said case and pivotally movable between off and on positions, a bracket mounted on said case adjacent said handle, a slide trapped by said bracket between the latter and the case and movable along said bracket in a direction transverse to the plane in which the circuit breaker handle pivots, said slide having a tongue and recess means on opposite sides of said tongue, said handle extending alternately through one or the other of said recess means so that said tongue restrains movement of said handle in the on or off handle positions, and said bracket restraining movement of said slide along the direction in which the circuit breaker handle pivots.

5. In combination, a circuit breaker including a case, a box enclosing said case, said box including a cover, a bracket secured to said case, said bracket comprising a plate overlying a portion of said case, said cover having a depressed portion and a hole therein, said bracket extending in part through said hole, said circuit breaker including a handle pivotally movable between the off and on positions, said handle extending through the hole in said cover but not beyond the depressed portion, said bracket further comprising upstanding arms forming with said case elongated grooves, said slide having a central tongue separating two recesses one of which is longer than the other, said cover having a latch lying below said slide and above said case, said slide in its first position overlying said cover latch and being out of engagement with said handle, said slide having upstanding tabs bent at a right angle to said tongue, said tabs and said arms being arranged in parallel planes for movement of said slide parallel to said arms and transversely to the plane in which said handle pivots, said slide having laterally projecting feet received in said grooves, said slide in its second position overlying said cover latch and restraining said handle from movement away from its on or olf positions, said slide in its third position restraining movement of said handle away from its off position and being out of latching relationship with said latch, said handle extending through the longer recess when said slide is in its third position, said handle extending through said shorter or longer recess when said slide is in its second position,

said slide being restrained from lateral movement parallel to the movement of the circuit breaker handle by said upstanding arms, said slide being limited from movement up and down by said arms in one direction and by said case in the otherdirection, said upstandings tabs each having three holes, said upstanding arms each having two holes, said holes in said slide and in said bracket being alignable to the three positions of said slide for receiving the hasp of a lock, and said bracket and slide having further holes to receive a sealing wire.

6. In combination, a circuit breaker including a case, a bracket mounted on the circuit breaker case, said circuit breaker including a handle movable to off and on positions, a slide movable transverse to the movement of said handle and having a tongue to restrain said handle from movement away from either the on or on positions, said slide being slidably connected to said bracket and movable along said bracket, said bracket being mounted on the circuit breaker case, said slide being movable to three positions along siad bracket in which positions said handle is restrained by said tongue in the off position or in the on position or is not restrained at all thereby, said slide and bracket having portions which may be tied together to maintain said tongue in one of said positions, said handle pivoting in a plane substantially perpendicular to the front face of the circuit breaker.

'7. In combination, a circuit breaker including a case, a bracket mounted on the circuit breaker case, said circuit breaker including a handle movable to off and on positions, a slide movable transverse to the movement of said handle and having a tongue to restrain said handle from movement away from either the on or off positions, said slide being slidably connected to said bracket and movable along said bracket, a box enclosing said case, said box including a cover, and said cover having a latch trapped between said case and said slide.

8. In combination, a circuit breaker including a handle, a box enclosing said circuit break-er, said box comprising a base and a cover through which said handle extends, a bracket secured to said circuit breaker below said cover and partially extending through said opening, a slide extending through said opening, said slide restraining said handle in various positions of said handle, first means connecting said slide to said bracket for movement of said slide relative to said handle but independently of said handle, pin means at one end of said cover for removing said cover, said pin means extending perpendicularly to the axis about which the cover pivots upon removal, whereby by pivoting said cover about the end of said cover having said pin means, moving said cover along one direction to free said cover from said base and then lifting it said cover is removed from said base, said slide being movable in a path transverse to the direction of movement of said cover, said cover including a latch trapped between said slide and said bracket, and said latch extending in the same direction as the path of movement of said slide.

9. The structure recited in claim 8 wherein said cover has a depressed section through which said handle extends.

10. The structure recited in claim 8 wherein said cover is biased against said bracket to seal the opening in said cover against the escape of hot gases and particles during arc extinction.

11. The structure recited in claim 7 wherein said cover defines a hole through which a part of said bracket extends, said circuit breaker handle is pivotally movable between theolf and on positions in a plane perpendicular to the plane through which said slide moves, said bracket defines with said case a groove, and said bracket having a foot portion received in said groove.

12. The structure recited in claim 11 wherein said foot portion is adjacent one end of said bracket, said slide is slidably movable along said bracket to three positions and positioned relative to said latch and said hole so that when said slide is in its first position said handle is either in the on or ofi positions and said slide overlies said latch and said tongue is not in the path of movement of said handle and does not restrain said handle, when said slide is in its second position said handle is either in the on or off positions and said slide overlies said latch and said tongue is in the path of movement of said handle when said handle is either in its on or off positions to restrain movement of said handle, and when said slide is in its third position said handle is only in its off position and said tongue is in the path of movement of said handle to restrain movement of said handle away from the off position but when said slide is in its third position it does not overlie said latch and is positioned relative tothe hole in said cover so .as to be bounded by said hole.

13. In combination, a circuit breaker including a case, a box enclosing the circuit breaker case, said box including a cover, a bracket secured to the circuit breaker case, said cover defining a hole through which a part of said bracket extends, said circuit breaker including a handle movable between ofi and on positions and extending through said hole, a slide having a handle restraining portion, said slide having feet received in grooves formed-by said bracket and case whereby said slide is movable along said bracket, said cover including a latch, said latch being trapped between said slide and said case when said slide is in two positions in one of which said slide portion restrains said handle from movement away from one of said on and off positions and in the other of which said slide portion permits free movement of said handle, said slide portion when in a third position restraining said handle from movement to the on position at which time said latch is not trapped, said slide and bracket having alignable holes cor-responding to the three positions to receive the hasp of a lock to secure said slide relative to said bracket.

14. In combination, a circuit breaker including a case, said box including a cover, said cover defining a hole, said circuit breaker including a handle movable between first and second positions and extending through said hole, a slide, means for mounting said slide on said case for slidable movement transverse to the movement of said handle and between three positions, said slide including a tongue, said slide having two recesses one of which is larger than the other, said tongue being between said recesses, said cover having a latch intermediate said slide and said case, said slide, latch and hole being positioned relative to each other so that when said slide is in its first position it overlies said latch and is out of engagement with said handle, when said slide, is inits second position it overlies said latch and said tongue is in the path of movement of'said handle to restrain said handle from movement away from the second han-' dle position, and when said slide is in its third position said tongue is in the path of movement of said handle to restrain movement of said handle away from the first handle position, does not overlie said latch and is within the boundary of said hole, said handle extending through the larger recess when said slide is in its third position and through the smaller recess when said slide is in its second position.

15. The'structure recited in claim 4 wherein said slide includes feet keyed to said bracket for slidable movement of said slide in a direction transverse to the plane in which the circuit breaker handle pivots and slidable to three positions, said handle extending through one or the other of said recess means when said handle is in the first two of its three positions and said handle being free of said tongue restraint when said slide is in its third position.

16. The structure recited in claim 15 and further including said bracket having upstanding arms on opposite sides'of said handle, said arms extending transverse to the plane in which said handle pivots, said bracket with aid @3 6. defining grooves receiving said feet, said arms 9 10 having holes therethrough, said slide having upstanding FOREIGN PATENTS tabs with holes therethrough, the arm holes and the tab holes being variously alignable when said slide is in 777,731 4/ 195's Great Bl'ltainits three positions, said holes being adapted to receive the p of a lock. 5 BERNARD A. GILHEANY, Primary Examiner. References Cited y the Examiner H. A. LEWITTER, Assistant Examiner.

, UNITED STATES PATENTS 3,024,337 3/1962 Goudy et a1. 200-44 x

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Classifications
U.S. Classification200/43.15, 200/50.3, 70/212, 200/293
International ClassificationH01H71/04, H01H9/28, H01H9/22
Cooperative ClassificationH01H71/04, H01H2009/305, H01H9/282, H01H9/22
European ClassificationH01H9/28B2