Electrical overload switching relay

Details Electrical overload switching relay Electrical overload switching relay

1977-01-17

1978-06-20

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 46, H01H 7116

Patent

active

040964655

ABSTRACT:
An overload switching relay for a multi-phase electricity supply responds to the value of the currents in the individual phases and actuates a contact-breaking switch in the event of either (i) the mean value of the currents on all phases exceeding a first threshold, and (ii) any differential arising, above a second threshold, between the currents of any two phases: means are provided to increase the threshold to differential actuation as the mean value of the entire plurality of currents increases.

REFERENCES:
patent: 2872548 (1959-02-01), Christensen
patent: 3451024 (1969-06-01), Fantini
patent: 3792401 (1974-02-01), Anderson

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