H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/39
H02H 3/08 (2006.01)
Patent
CA 2027931
PPF 2 003 INTRINSICALLY SAFE BARRIER DEVICE Abstract of the Disclosure An protection barrier provides voltage and current necessarily conveyed to hazardous, such as explosive, areas. The system includes a current sensing circuit which triggers a silicon control rectifier based crowbar circuit in the event over current is detected. This triggering, in turn, trips a relay severing the current path entirely. A reverse polarity circuit provides for immediate clamping of improperly bias connections in a similar crowbar arrangement, and also provides for tripping of the circuit breaker. Thermistors are also provided in current series in the event the circuit breaker fails to trip, or is forcibly bypassed. The circuit breaker additional provides a visual indicator when it is in the tripped position. The intrinsic barrier system is suitable to serving as a first stage protection to zener barrier modules as utilized in the prior art.
Pepperl + Fuchs Inc.
Sim & Mcburney
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