Thermal trip device having a current redirecting linking element, switching device, thermal magnetic circuit breaker and method for protecting an electric circuit

Patent metadata

Field	Value
Publication number	US-9508516-B2
Application number	US-201414522706-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Jan 17, 2014
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A thermal trip device, of a thermal magnet circuit breaker is disclosed for protecting an electrical circuit from damage by overload, a switching device and a thermal magnetic circuit breaker including at least the thermal trip device are disclosed. In at least one embodiment, the thermal trip device includes at least a bimetal element arranged with a first end at a current conductive element to conduct electrical current and arranged with a second end at a tripping slide adapted to interrupting a current flow. The at least a bimetal element is connectable with a linking element extending between the bimetal element and the current conductive element to redirect the electrical current at least partially. Furthermore, a method is disclosed for protecting an electric circuit from damage by overload by use of the thermal trip device of a thermal magnet circuit breaker.

First claim

What is claimed is:

1. Thermal trip device of a thermal magnet circuit breaker for protecting an electrical circuit from damage by overload, comprising:
at least one bimetal element, arranged with its first end at a current conductive element to conduct electrical current and arranged with its second end at a tripping slide, adapted to interrupt a current flow, wherein the at least one bimetal element connectable with a linking element extending between the at least one bimetal element and the current conductive element to at least partially redirect the electrical current, wherein the linking element is arranged with one end affixed between the first end and the second end of the at least one bimetal element and another end affixed to the current conductive element.

2. Thermal trip device of claim 1 , wherein the linking element includes a flexible material having at least partially a linear elastic behavior.

3. Thermal trip device of claim 1 , wherein the linking element includes a well-conductive material like a copper material.

4. Thermal trip device of claim 1 , wherein the linking element is adjustably arranged at at least one of the at least one bimetal element and the current conductive element.

5. A switching device, comprising:
at least one bimetal element, arranged with a first end at a current conductive element and arranged with a second end at a tripping slide, the current conductive element being configured to conduct electrical current, the tripping slide adapted to interact with a kicker element, and a linking element extending between the at least one bimetal element and the current conductive element to at least partially redirect at least one of the electrical current and the kicker element in order to hitch a mechanism trip bar, to unlatch a breaker mechanism, to interrupt the current flow, wherein the linking element is arranged with one end affixed between the first end and the second end of the at least one bimetal element and another end affixed to the current conductive element.

6. A thermal magnetic circuit breaker for protecting an electrical circuit from damage caused by overload or short circuit, comprising:
at least the thermal trip device of claim 1 .

7. The thermal magnetic circuit breaker of claim 6 , further comprising:
a magnetic trip device, including at least an armature element to react to a magnetic field resulting from current flowing through a solenoid element.

8. A method for protecting an electric circuit from damage by overload via a thermal trip device of a thermal magnet circuit breaker, the method comprising:
conducting an electric current at least partially from a current conductive element, via at least a part of a bimetal element arranged with a lower end on the current conductive element, along a linking element arranged between the current conductive element and the bimetal element, and back to the current conductive element to heat the bimetal element to obtain a mechanical displacement of at least one area of the bimetal element, wherein the linking element is arranged with one end affixed between the first end and the second end of the at least one bimetal element and another end affixed to the current conductive element.

9. The method of claim 8 , wherein the thermal trip device includes at least one bimetal element, arranged with its first end at a current conductive element to conduct electrical current and arranged with its second end at a tripping slide, adapted to interrupt a current flow, wherein the at least one bimetal element connectable with a linking element extending between the at least one bimetal element and the current conductive element to at least partially redirect the electrical current.

10. Thermal trip device of claim 1 , wherein the linking element is arranged with one end between the first end and the second end of the at least one bimetal element, in a middle area of the at least one bimetal element with respect to its longitudinal axis.

11. Thermal trip device of claim 3 , wherein the linking element includes a copper braid.

12. Thermal trip device of claim 1 , wherein the linking element is directly attached to a surface of the at least one bimetal element and a surface of the current conductive element.

13. The thermal magnetic circuit breaker of claim 6 , wherein the linking element is directly attached to a surface of the at least one bimetal element and a surface of the current conductive element.

Assignees

• Siemens Ag

Inventors

• Cantu Gonzalez Roberto Federico

Classifications

• H01H2071/084

  specially adapted for avoiding decalibration of trip unit, e.g. bimetal, when fixing conductor wire to connector · CPC title

• H01H71/16 Primary

  with bimetal element {(combined with detection of imbalance of two or more currents H01H83/223)} · CPC title

• H01H2071/168

  Provisions for avoiding permanent deformation and thus decalibration of bimetal, e.g. due to overheating or action of a magnet · CPC title

• H01H71/164

  Heating elements · CPC title