Motor starting and protecting apparatus

Details Motor starting and protecting apparatus Motor starting and protecting apparatus

1976-07-29

1978-05-30

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318221H, H02H 708

Patent

active

040925730

ABSTRACT:
A combination starting and protecting device particularly useful with split phase motors such as those used with refrigeration compressors is disclosed in which an element of material having a positive temperature coefficient (PTC) of resistivity characteristic and a thermally responsive switch are disposed in the same housing. A thermal coupling of a preselected value between the PTC element and the thermally responsive switch is provided so that a desired reset or "off" time is obtained for the thermally responsive switch without affecting the "on" time.

REFERENCES:
patent: 3521138 (1970-07-01), Enemark et al.
patent: 3921117 (1975-11-01), Blaha

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