absorption circuit module used on protecting the or thyristor because it can avoid damage that from inductive electromotive force generated by the inductive load when on or off. electromagnetic and increasing the anti-jamming capability of the microcontroller. For or for 5 ~ 400V inductive load (less than 1000W), for contacts or thyristor. absorption circuit,absorb induced electromotive force that from inductive load. With varistor, to excessive fluctuations in or current is too large and resulting in adhesion. To provide anti-interference ability of the circuit.