Protective input circuit for an instrument

Details Protective input circuit for an instrument Protective input circuit for an instrument

1993-05-03

1995-01-03

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 56, 361108, 361111, H02H 504

Patent

active

053791762

ABSTRACT:
A protective circuit for the input of a multimeter is provided with series connected thermistors partially shunted by a varistor whereby overload voltage is distributed between the thermistors enabling protection at higher voltage levels. Shunt connected varistors protect primarily against transient overloads and are thermally coupled to the aforementioned thermistors to bring the thermistors more rapidly to their high resistance condition such that damage to the varistors is avoided and continued protection is provided.

REFERENCES:
patent: 4068281 (1978-01-01), Harnden, Jr.
patent: 4583146 (1986-04-01), Howell
patent: 4967176 (1990-10-01), Horsma et al.
patent: 5250893 (1993-10-01), Gambill et al.

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