Electronic thermal relay and appropriate thermal element

Details Electronic thermal relay and appropriate thermal element Electronic thermal relay and appropriate thermal element

1989-12-28

1992-02-11

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, 361380, 338 20, H02H 504

Patent

active

050880004

ABSTRACT:
An electronic thermal relay is disclosed which can be associated with a multiphase electric load for generating a pre-alarm and/or an order for cutting off the power supply to the load in the case of a current overload in at least one phase or an imbalance between phase currents.
With each phase is associated a thermal element with a resistive heating element through which the phase current flows, a resistive sensor transmitting to a signal processing circuit a signal representative of the heating and a thermal memory mass. The heating element is thermally coupled to the sensor and to the memory mass by a coupling body whose thermal inertia is less than that of the memory mass.

REFERENCES:
patent: 4450496 (1989-05-01), Doljack
patent: 4879626 (1989-11-01), Kim
patent: 4907126 (1990-03-01), Hendel

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