THREE PHASE REMOTE CONTROL CIRCUIT BREAKER

• US 3,863,186 A
• Filed: 10/26/1973
• Issued: 01/28/1975
• Est. Priority Date: 10/26/1973
• Status: Expired due to Term

• Current Assignee: Edward A. Mallonen
• Original Assignee: Edward A. Mallonen
• Inventors: Mallonen, Edward A.
• Primary Examiner(s): Broome, Harold
• Application Number:
  US05/409,785
• Time in Patent Office: 459 Days
• Field of Search: 337/99,378,70,78,38,39,40,41,42,45,46,48 335/44
• US Class Current: 337/99
• CPC Class Codes: H01H 2071/467 with history indication, e.g. of trip and/or kind of trip, number of short circuits etc.
• CPC Class Codes: H01H 71/162 with compensation for ambient temperature
• CPC Class Codes: H01H 71/46 having means for operating auxiliary contacts additional to the main contacts

Abstract

A three phase electromagnetically operated circuit breaker for use in a remote control circuit breaker system is disclosed. It features unitary enclosure and mounting of the stationary and movable contact mechanisms, the electromagnetic operating mechanism, the thermally responsive contact trip release mechanism, and the electronic control for the circuit breaker system. The contact trip mechanism is responsive to overload currents in one or more of the phase branches and features novel differential action ambient temperature compensation afforded by ambient temperature responsive bimetal members individual to each of the three phases.

Claims

1. In an electro-thermal latch trip mechanism the combination with a pivotally mounted latch having means biasing it towards a latching position a. of a plurality of bimetal members connectable in the respective branches of an electrical load circuit b. a member having portions in line with respective ones of said bimetal members, and c. ambient temperature compensator bimetal members spaced apart and corresponding in number to the first mentioned bimetal members and attached at corresponding ends to said latch and attached to and supporting said member at their other ends d. said first mentioned bimetal members warping toward and engaging with said member in accordance with the overload current flowing therethrough to pivot said latch out of its latching position, and e. said compensator bimetal members individually and differentially tending to warp and pivot said member away from said bimetal members and toward said latach in accordance to the ambient temperature to which they are subjected.

2. The latch trip mechanism according to claim 1 wherein said compensator bimetal members have intermediate portions of helical section in form.