Electrical switching apparatus with electronic trip unit

Patent metadata

Field	Value
Publication number	US-9728348-B2
Application number	US-201514976619-A
Country	US
Kind code	B2
Filing date	Dec 21, 2015
Priority date	Dec 21, 2015
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An electrical switching apparatus includes a housing, a line terminal, a load terminal, separable contacts disposed on a conductive path between the line terminal and the load terminal, an operating mechanism structured to open and close said separable contacts, said operating mechanism including a trip bar, and an electronic trip unit. The electrical switching apparatus also includes a trip actuator assembly including an actuator housing coupled to said housing, an actuator coupled to said actuator housing, and a connector structured to electrically connect the actuator to an electronic trip unit. The electrical switching apparatus further includes a current transformer assembly including a rod-shaped conductor electrically coupled to the load terminal and a current transformer disposed around the rod-shaped conductor, wherein the electronic trip unit is structured to electrically control actuation of the actuator.

First claim

What is claimed is:

1. An electrical switching apparatus comprising:
a housing including a number of auxiliary pockets;
a line terminal;
a load terminal;
separable contacts disposed on a conductive path between the line terminal and the load terminal;
an operating mechanism structured to open and close said separable contacts, said operating mechanism including a trip bar;
an electronic trip unit;
a trip actuator assembly including:
an actuator housing coupled to said housing;
an actuator coupled to said actuator housing; and
a connector structured to electrically connect the actuator to an electronic trip unit; and

a current transformer assembly including:
a rod-shaped conductor electrically coupled to the load terminal; and
a current transformer disposed around the rod-shaped conductor,

wherein the electronic trip unit is structured to electrically control actuation of the actuator, and
wherein the separable contacts, the operating mechanism, and the current transformer are disposed in an interior of the housing and the trip actuator assembly is disposed in one of the auxiliary pockets on an exterior of the housing.

2. The electrical switching apparatus of claim 1 , wherein the electrical switching apparatus is a compact molded case circuit breaker.

3. The electrical switching apparatus of claim 1 , wherein a shape of the actuator housing corresponds to a shape of the auxiliary pocket the trip actuator assembly is disposed in.

4. The electrical switching apparatus of claim 1 , wherein the electronic trip unit is disposed in another one of the auxiliary pockets.

5. The electrical switching apparatus of claim 1 , wherein the trip actuator assembly further includes a reset push button structured to reset the actuator.

6. The electrical switching apparatus of claim 1 , wherein the trip actuator is structured to interact with the trip bar to cause the operating mechanism to open the separable contacts.

7. The electrical switching apparatus of claim 1 , wherein the actuator assembly includes an aperture formed therein, and wherein the connector is structured to extend through the aperture to electrically connect to the electronic trip unit.

8. The electrical switching apparatus of claim 1 , wherein the current transformer is electrically connected to the electronic trip unit via the connector, and wherein the current transformer is structured to sense a magnitude of current flowing between the line terminal and the load terminal and to provide the sensed magnitude to the electronic trip unit.

9. The electrical switching apparatus of claim 8 , wherein the current transformer is structured to provide power to the electronic trip unit.

10. The electrical switching apparatus of claim 1 , wherein the current transformer assembly includes a flat conductor electrically connected between the load terminal and the rod-shaped conductor.

11. The electrical switching apparatus of claim 10 , wherein the current transformer is disposed in a bottom portion of an inside of the housing, and wherein the rod-shaped conductor extends from the flat conductor toward a bottom surface of the housing.

12. The electrical switching apparatus of claim 10 , wherein the current transformer assembly further includes a temperature sensor structured to sense a temperature of the flat conductor, and wherein the temperature sensor is disposed on the flat conductor.

13. The electrical switching apparatus of claim 12 , wherein the temperature sensor is a thermal diode.

14. The electrical switching apparatus of claim 1 , further comprising:
a push-to-trip button structured to interact with the trip bar to cause the operating mechanism to open the separable contacts.

15. The electrical switching apparatus of claim 1 , wherein the electronic trip unit is structured to adjust trip characteristics of the electrical switching apparatus.

Assignees

• Eaton Corp

Inventors

• Zhou Xin
• Stifter Jr Frank Joseph
• Zheng Gerald
• Jansto Brian Scott
• Miller Theodore James

Classifications

• H01H7/06

  with thermal timing means · CPC title

• H01H71/125 Primary

  characterised by sensing elements, e.g. current transformers (for differential protection H01H83/144) · CPC title

• H01H9/0271 Primary

  structurally combining a switch and an electronic component (for relays H01H50/021) · CPC title

• H01H50/36

  Stationary parts of magnetic circuit, e.g. yoke · CPC title

• H01H71/0207

  Mounting or assembling the different parts of the circuit breaker · CPC title