Motor protector device

Details Motor protector device Motor protector device

1998-03-04

1999-11-30

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 24, 361104, 361 26, H02H 504

Patent

active

059953519

ABSTRACT:
A motor protector (1, 1A) for connection in a circuit for supplying electrical power to a motor (36) to be protected includes first (S1), second (S2) and third (S3) switches in a housing member (2, 3). Each switch (S1, S2, S3) uses a snap-acting bimetallic member (8, 11, 13) for opening and closing electrical contacts (4a and 5a, 8a and 8b; 17 and 27; 18 and 30) of the respective switch. The switches (S1, S2, S3) in the housing member (2, 3) are connected as part of the circuit supplying electrical power to the motor (36) being electrically connected in series with one another so that the opening of any one of them will stop the flow of power to the motor (36) to be protected.

REFERENCES:
patent: 5303143 (1994-04-01), Sommer et al.
patent: 5515229 (1996-05-01), Takeda
patent: 5627506 (1997-05-01), Suzuki

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