Short circuit indicating devices and methods for circuit breakers

Patent metadata

Field	Value
Publication number	US-9455108-B2
Application number	US-201214366963-A
Country	US
Kind code	B2
Filing date	Feb 29, 2012
Priority date	Feb 29, 2012
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A device is provided for use with a circuit breaker that includes a magnetic trip bar adapted to move from a non-tripped position to a tripped position in response to a short-circuit condition, and move from the tripped position to the non-tripped position to reset the circuit breaker. The device includes a slider that has a first position and a second position, and a latch coupled to the magnetic trip bar and the slider. As the magnetic trip bar moves from the non-tripped position to the tripped position, the latch is adapted to move the slider from the first position to the second position to indicate that a short circuit trip has occurred. Numerous other aspects are provided.

First claim

The invention claimed is:

1. A device for use with a circuit breaker that includes a magnetic trip bar adapted to move from a non-tripped position to a tripped position in response to a short-circuit condition, and move from the tripped position to the non-tripped position to reset the circuit breaker, the device comprising:
a magnetic trip bar extension of the magnetic trip bar having an edge and a first surface, wherein when a short-circuit trip event occurs, the magnetic trip bar extension rotates in a clockwise direction;
a housing having a window to visually indicate presence or absence of a magnetic or short circuit trip event;
a slider that comprises a first position and a second position,
wherein the slider is disposed in the housing, the slider having a first end visible through the window when the slider is in the second position to visually indicate that the magnetic or short circuit trip event has occurred and with an absence of the first end of the slider into the window when the slider is in the first position to visually indicate that the magnetic or short circuit trip event has not occurred; and
a latch coupled to the magnetic trip bar and the slider,
wherein as the magnetic trip bar moves from the non-tripped position to the tripped position, the latch is adapted to move the slider from the first position to the second position to indicate that a short circuit trip has occurred,
wherein the latch is configured to prevent the magnetic trip bar from being reset until the slider is manually moved from the second position to the first position,
wherein the latch includes a first end and a second end, the first end includes a first beveled surface and a second beveled surface, the second end includes a tab having a third beveled surface, wherein when the short-circuit trip event occurs the first surface of the magnetic trip bar extension slidingly engages the first beveled surface of the latch, the second beveled surface of the latch engages the edge of the magnetic trip bar extension, which prevents the circuit breaker from being reset and wherein if a user manually pushes the slider, the third beveled surface causes the second beveled surface of the latch to disengage the edge of the magnetic trip bar extension, which allows the magnetic trip bar extension to rotate counterclockwise and return to its original position, thereby allowing the circuit breaker to be reset.

2. The device of claim 1 , wherein when the slider is in the second position, the slider is adapted to engage the latch to hold the magnetic trip bar in the tripped position.

3. The device of claim 1 , wherein when a user moves the slider from the second position to the first position, the slider is adapted to engage the latch to release the magnetic trip bar, allowing the magnetic trip bar to return from the tripped position to the non-tripped position.

4. The device of claim 1 , wherein the latch comprises a first end coupled to the magnetic trip bar, a second end coupled to the slider, and a pivot point.

5. The device of claim 4 , wherein the first end of the latch is adapted to engage the magnetic trip bar.

6. The device of claim 1 , wherein:
the slider comprises a stop; and
the latch comprises a tab adapted to engage the stop.

7. The device of claim 6 , wherein as the magnetic trip bar moves from the non-tripped position to the tripped position, the latch is adapted to pivot, allowing the stop to slide in a first direction.

8. The device of claim 6 , wherein as the slider moves from the second position to the first position, the latch is adapted to pivot, allowing the stop to slide in a second direction.

9. A modular accessory for use with a circuit breaker that includes a magnetic trip bar adapted to move from a non-tripped position to a tripped position in response to a short-circuit condition, and move from the tripped position to the non-tripped position to reset the circuit breaker, the modular accessory comprising:
a magnetic trip bar extension of the magnetic trip bar having an edge and a first surface, wherein when a short-circuit trip event occurs, the magnetic trip bar extension rotates in a clockwise direction;
a housing having a window to visually indicate presence or absence of a magnetic or short circuit trip event;
a slider that comprises a first position and a second position,
wherein the slider is disposed in the housing, the slider having a first end visible through the window when the slider is in the second position to visually indicate that the magnetic or short circuit trip event has occurred and with an absence of the first end of the slider into the window when the slider is in the first position to visually indicate that the magnetic or short circuit trip event has not occurred; and
a latch coupled to the magnetic trip bar and the slider,
wherein as the magnetic trip bar moves from the non-tripped position to the tripped position, the latch is adapted to move the slider from the first position to the second position to indicate that a short circuit trip has occurred,
wherein the latch is configured to prevent the magnetic trip bar from being reset until the slider is manually moved from the second position to the first position,
wherein the latch includes a first end and a second end, the first end includes a first beveled surface and a second beveled surface, the second end includes a tab having a third beveled surface, wherein when the short-circuit trip event occurs the first surface of the magnetic trip bar extension slidingly engages the first beveled surface of the latch, the second beveled surface of the latch engages the edge of the magnetic trip bar extension, which prevents the circuit breaker from being reset and wherein if a user manually pushes the slider, the third beveled surface causes the second beveled surface of the latch to disengage the edge of the magnetic trip bar extension, which allows the magnetic trip bar extension to rotate counterclockwise and return to its original position, thereby allowing the circuit breaker to be reset.

10. The modular accessory of claim 9 , wherein when the slider is in the second position, the slider is adapted to engage the latch to hold the magnetic trip bar in the tripped position.

11. The modular accessory of claim 9 , wherein when a user moves the slider from the second position to the first position, the slider is adapted to engage the latch to release the magnetic trip bar, allowing the magnetic trip bar to return from the tripped position to the non-tripped position.

12. The modular accessory of claim 9 , wherein the latch comprises a first end coupled to the magnetic trip bar, a second end coupled to the slider, and a pivot point.

13. The modular accessory of claim 12 , wherein the first end of the latch is adapted to engage the magnetic trip bar.

14. The modular accessory of claim 9 , wherein:
the slider comprises a stop; and
the latch comprises a tab adapted to engage the stop.

15. The modular accessory of claim 14 , wherein as the magnetic trip bar moves from the non-tripped position to the tripped position, the latch is adapted to pivot, allowing the stop to slide in a first direction.

16. The modular accessory of claim 14 , wherein as the slider moves from the second position to the first position, the latch is adapted to pivot, allowing the stop to slide in a second direction.

17. A method for use with a circuit breaker that includes a magnetic trip bar adapted to move from a non-tripped position to a tripped position in response to a short-circuit condition, and move from the tripped posit

Assignees

• Thomas Stephen Scott
• Siemens Ag

Inventors

• Thomas Stephen Scott

Classifications

• H01H71/12 Primary

  Automatic release mechanisms with or without manual release · CPC title

• H01H71/04 Primary

  Means for indicating condition of the switching device {(by means of an auxiliary contact H01H71/46)} · CPC title