# US 2019/0103242 A1 · Circuit breaker

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- Number: US 2019/0103242 A1
- Document ID: US20190103242A1
- Status: Published application
- Kind: A1
- Application number: 16/086,613
- Filed: 2017-03-22
- Published: 2019-04-04
- Earliest claimed: 2016-03-22
- Assignees: Eaton Intelligent Power Limited
- Applicants: Eaton Intelligent Power Limited
- Inventors: Adolf Tetik; Alfred Nyzner
- Web page: https://patentgrep.com/patent/US20190103242A1

## CPC

- H01H 71/402: {in which the thermal mechanism influences the magnetic circuit of the electromagnetic mechanism}
- H01H 71/16: with bimetal element {(combined with detection of imbalance of two or more currents H01H83/223)}
- H01H 71/2463: {with plunger type armatures}
- H01H 71/40: Combined electrothermal and electromagnetic mechanisms
- H01H 71/48: with provision for short-circuiting the electrical input to the release mechanism after release of the switch, e.g. for protection of heating wire
- H01H 71/7436: {Adjusting the position (or prestrain) of the bimetal (H01H71/7445 takes precedence)}
- H01H 2071/749: {with a shunt element connected in parallel to magnetic or thermal trip elements, e.g. for adjusting trip current}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

A circuit breaker includes a short-circuit trip and an overcurrent trip. The short-circuit trip has a trip coil, and the overcurrent trip has a bimetallic element. A first terminal of the trip coil is conductively connected to a fixed contact carrier of the circuit breaker. The bimetallic element is connected in series with the trip coil. The bimetallic element is connected at least indirectly to a first connection terminal of the circuit breaker, and the first connection terminal is connected to the fixed contact carrier by a bypass line.

## Claims

### Claim 1

A circuit breaker comprising:
a short-circuit trip; and
an overcurrent trip,
wherein the short-circuit trip has a trip coil,
wherein the overcurrent trip has a bimetallic element,
wherein a first terminal of the trip coil is conductively connected to a fixed contact carrier of the circuit breaker,
wherein the bimetallic element is connected in series with the trip coil,
wherein the bimetallic element is connected at least indirectly to a first connection terminal of the circuit breaker, and
wherein the first connection terminal is connected to the fixed contact carrier by a bypass line.

### Claim 2 (depends on 1)

The circuit breaker according to claim 1, wherein a second terminal of the trip coil is conductively connected to the bimetallic element by a flexible conductor.

### Claim 3 (depends on 1)

The circuit breaker according to claim 1, wherein the bimetallic element is fastened to a terminal bracket of the first connection terminal.

### Claim 4 (depends on 1)

The circuit breaker according to claim 1,
wherein an adjustment apparatus for adjusting the bimetallic element is arranged on the first connection terminal, and
wherein the bimetallic element is fastened to the adjustment apparatus by a first bimetallic element end.

### Claim 5 (depends on 4)

The circuit breaker according to claim 4, wherein the adjustment apparatus has a threaded opening which is arranged so as to be spaced apart from the bimetallic element and in which an adjustment screw is arranged.

### Claim 6 (depends on 5)

The circuit breaker according to claim 5, wherein the adjustment screw is mounted in a housing part of the circuit breaker in such a way that an angle between the adjustment apparatus and the first connection terminal is altered when the adjustment screw is rotated.

### Claim 7 (depends on 1)

The circuit breaker according to claim 1, wherein the bimetallic element is arranged within the circuit breaker so as to be adjacent to the trip coil, substantially in parallel with a longitudinal extension of the trip coil.

### Claim 8 (depends on 1)

The circuit breaker according to claim 1, wherein the bimetallic element is fastened to the first connection terminal.

### Claim 9 (depends on 1)

The circuit breaker according to claim 1, wherein a terminal bracket of the first connection terminal is connected to the fixed contact carrier by the bypass line.