Intrinsically safe transient suppression protection circuit

The utility model provides an intrinsically safe transient suppression protection circuit. The intrinsically safe transient suppression protection circuit comprises a power supply input end and a voltage reduction end, the circuit also comprises a first-stage protection circuit and a second-stage protection circuit, the first-stage protection circuit is connected with the power input end, and the second-stage protection circuit is connected with the voltage reduction end. The primary protection circuit comprises a fuse F1, a transient suppression diode D19, a diode D1, a diode D6, a diode D20, a diode D21, a voltage stabilizing diode D2 and a voltage stabilizing diode D13; the circuit is simple in structure and small in duty ratio, space occupied by the circuit can be better reduced, dual protection is achieved, and reverse connection of a power supply and burnout of components are prevented. 本实用新型提供了一种本质安全型瞬态抑制保护电路，包括电源输入端和降压端；还包括一级保护电路和二级保护电路，所述一级保护电路连接所述电源输入端，所述二级保护电路连接所述降压端；所述一级保护电路包括保险丝F1、瞬态抑制二极管D19、二极管D