Motor starting relay device having PTC thermistors

Details Motor starting relay device having PTC thermistors Motor starting relay device having PTC thermistors

1993-10-01

1995-06-27

Young, Brian K.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 29, 318784, H02H 700

Patent

active

054284937

ABSTRACT:
In a relay device, a first PTC thermistor has one end connected to a first external connecting terminal, and the other end connected to one end of a second PTC thermistor, the other end of which is connected to a second external connecting terminal, and the thermo-switch is thermally coupled to the first and second PTC thermistors, and connected in parallel with the second PTC thermistor. The thermo-switch is held closed when not heated, and is opened by heat generated by the first or second PTC thermistor. Therefore, the relay device is low in initial resistance, and small in power consumption during heat balance.

REFERENCES:
patent: Re31367 (1983-08-01), D'Entremont
patent: 4445079 (1984-04-01), DeFilippis et al.
patent: 4683515 (1987-07-01), Beihoff et al.
patent: 4901186 (1990-02-01), Tennant et al.
K. Takasawa, pp. 777-781, "Application of PTC Thermistor to starter for air-conditioner compressor" no month 1875.

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