Molded case circuit breaker with improved high fault current int

Details Molded case circuit breaker with improved high fault current int Molded case circuit breaker with improved high fault current int

1984-04-20

1985-07-02

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200303, 361376, 361331, H01H 3302, H01H 902

Patent

active

045270279

ABSTRACT:
A contact structure (40, 44; 62, 63) is arranged to provide oppositely directed parallel current paths within a closed loop magnetic flux amplifier (46) to be directly separable under high overload current conditions, the flux amplifier (46) functioning to arrest the movable contact (62, 63) momentum. Manufacturing economies are realized by subassembling the stationary contact structure (40, 42, 44) and flux amplifier (46) and subsequently trapping one end (42a) of that assembly within the base (4a) and securing the other end with a single screw (68). The movable contact arm (62) comprises a plurality of blanked laminations assembled to provide improved contact (63) mounting and bearing (62d) surfaces. The molded case sidewalls are strengthened in the contact separation area by offsetting the parting line (PL) between cover (6) and base (4) closer to the bottom of base (4) and overlapping the thinner base sidewalls with thicker cover sidewalls at the offset (4e, 6e).

REFERENCES:
patent: 2643312 (1953-06-01), Rodden
patent: 2681964 (1954-06-01), Rodden
patent: 2908782 (1959-10-01), Kiesel et al.
patent: 3143627 (1964-08-01), Kiesel et al.
patent: 3211960 (1965-10-01), Dorfman et al.
patent: 3492609 (1970-01-01), Murai et al.
patent: 3815059 (1974-06-01), Spoelman
patent: 4225748 (1980-09-01), Buck et al.
patent: 4286130 (1981-08-01), Troebel

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