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Publication of TW325603BpublicationCriticalpatent/TW325603B/en
A A-shaped protection circuit between alternating current and load comprises PTC, resistor, SIDAC and MOV etc. components, in which (1) One end of PTC connects with alternating current, the other one connecting with SIDAC with over-high voltage protection function; (2) One end of resistor connects with alternating current, the other one connecting with the other one of SIDAC with over-high voltage protection function; (3) Two ends of SIDAC with over-high voltage protection function are load ends; (4) Grounding end connects with one end of two MOVs, and the two ends of MOV individually connecting with two ends of SIDAC with over-high voltage protection function, in which breaker voltage is dependent on demand, without self-constraints; (5) Breaker voltage characteristic decides alternative of both SIDAC and MOV, without self-constraints; (6) Characteristic of setting the highest tolerant current decides alternative between PTC and resistor, without self-constraints.