Contact module for circuit breaker

Patent metadata

Field	Value
Publication number	US-9704675-B2
Application number	US-201415024334-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 24, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A contact module for a circuit breaker is disclosed, comprising: a base, a cover, an operation mechanism, at least three kinds of asymmetrical single-pole switches and a release mechanism. The cover is mounted on the base to form a space, where the mechanisms and the switches are disposed. The operation mechanism is connected to one switch; the release mechanism to the at least three switches. Each switch comprises a strong side and a weak side. For each switch, there is a thick contact housing on the strong side connected to a thick shaft, and a thin one on the weak side connected to a thin shaft. A rotor component has a single contact spring mounted on the weak side. Rotation shafts are connected by a linkage shaft to connect the single-pole switches; a strong side of one switch is connected to a weak side of another switch.

First claim

What is claimed is:

1. A contact module for a circuit breaker comprising: a base, a cover, an operation mechanism, at least three single-pole switches and a release mechanism, wherein
the cover is mounted on the base to form an accommodation space, in which the operation mechanism, the at least three single-pole switches and the release mechanism are disposed;
the operation mechanism is connected to one of the at least three single-pole switches, and the release mechanism is connected to the at least three single-pole switches;
all of the at least three single-pole switches are asymmetrical, each single-pole switch comprises a strong side and a weak side; for each single-pole switch, a contact housing on the strong side is thick and is connected to a thick shaft, while a contact housing on the weak side is thin and is connected to a thin shaft; a rotor component in each single-pole switch only has a single contact spring and the single contact spring is mounted on the weak side;
rotating shafts of adjacent single-pole switches are connected by a linkage shaft so that the single-pole switches are connected, and a strong side of one single-pole switch is connected to a weak side of another single-pole switch.

2. The contact module for circuit breaker according to claim 1 , wherein each single-pole switch comprises a contact housing module assembled by two contact housings, a rotor component disposed in the contact housing module, and two rotation shafts connecting the rotor component and the two contact housings:
the assembled two contact housings form an internal chamber in which the rotor component is mounted, the contact housing on the strong side forms thick side walls of the internal chamber and the contact housing on the weak side forms thin side walls of the internal chamber;
the thick shaft cooperates with the thick side walls of the internal chamber formed by the contact housing on the strong side, and a strong side lug is provided;
the thin shaft cooperates with the thin side walls of the internal chamber formed by the contact housing on the weak side, and a weak side lug is provided.

3. The contact module for circuit breaker according to claim 2 , wherein the strong side lug is step-shaped, the weak side lug is inclined.

4. The contact module for circuit breaker according to claim 2 , wherein the at least three single-pole switches comprise a first single-pole switch, a second single-pole switch and a third single-pole switch;
two first single-pole switches act as N phase and A phase of the contact module, the operation mechanism is connected to the second single-pole switch, the second single-pole switch acts as B phase of the contact module, the third single-pole switch acts as C phase of the contact module.

5. The contact module for circuit breaker according to claim 4 , wherein the first single-pole switch comprises a first contact housing, a second contact housing, a first rotation shaft, a second rotation shaft, a first rotor component, a static contact and an arc extinguishing chamber;
the first contact housing is a strong side contact housing and the second contact housing is a weak side contact housing, the first contact housing and the second contact housing are assembled to form an internal chamber, which accommodates the first rotor component, the static contact and the arc extinguishing chamber;
the first rotation shaft is a thick rotation shaft and cooperates with the first contact housing, the second rotation shaft is a thin shaft and cooperates with the second contact housing, the first rotation shaft does not extend outside the first contact housing, while the second rotation shaft extends outside the second contact housing.

6. The contact module for circuit breaker according to claim 5 , wherein the second single-pole switch comprises a third contact housing, a fourth contact housing, a first rotation shaft, a third rotation shaft, a second rotor component, a static contact and an arc extinguishing chamber;
the third contact housing is a weak side contact housing and has a symmetric structure with respect to the second contact housing, the fourth contact housing is a strong side contact housing and has a symmetric structure with respect to the first contact housing, the third contact housing and the fourth contact housing are assembled to form an internal chamber, which accommodates the second rotor component, the static contact and the arc extinguishing chamber, the second rotor component has a symmetric structure with respect to the first rotor component;
the first rotation shaft cooperates with the fourth contact housing, the third rotation shaft is a thin shaft and cooperates with the third contact housing, the third rotation shaft does not extend outside the third contact housing, and the first rotation shaft does not extend outside the fourth contact housing.

7. The contact module for circuit breaker according to claim 6 , wherein the third single-pole switch comprises a third contact housing, a fourth contact housing, a first rotation shaft, a second rotation shaft, a second rotor component, a static contact and an arc extinguishing chamber;
the third contact housing is a weak side contact housing and has a symmetric structure with respect to the second contact housing, the fourth contact housing is a strong side contact housing and has a symmetric structure with respect to the first contact housing, the third contact housing and the fourth contact housing are assembled to form an internal chamber, which accommodates the second rotor component, the static contact and the arc extinguishing chamber, the second rotor component has a symmetric structure with respect to the first rotor component;
the first rotation shaft cooperates with the fourth contact housing, the second rotation shaft cooperates with the third contact housing, the first rotation shaft does not extend outside the fourth contact housing, while the second rotation shaft extends outside the third contact housing.

Assignees

• Seari Electric Technology Co Ltd
• Zhejiang Chint Electrics Co Ltd

Inventors

• Liu Yi
• Gu Xiang
• Wang Zhongbin

Classifications

• H01H1/2058 Primary

  Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker · CPC title

• H01H33/53

  Cases (for switchgear H02B1/26); Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices · CPC title

• H01H1/205

  Details concerning the elastic mounting of the rotating bridge in the rotor · CPC title

• H01H71/0257

  Strength considerations · CPC title

• H01H71/1009

  Interconnected mechanisms (H01H71/1045 takes precedence; operated by excess current and other electrical conditions H01H83/20) · CPC title