| 摘要 |
PURPOSE: A pilot lamp luminescent circuit and an explosion protected switch are provided to prevent a wrong operation caused due to an induction power by offsetting an induction power generated between a power line and a ground line. CONSTITUTION: A pilot lamp luminescent circuit includes a voltage dropping circuits(10,12), circuit protecting resistances(R3,R4), rectifying diodes(D1,D2), induction voltage preventing resistances(R5,R6), and pilot lamps(LED1,LED2) in respective input terminals(H,P). In the voltage dropping circuit(10), a capacitor(C1) and the resistance(R1) are connected in parallel. When an on-switch of an explosion protected switch is turned on, a power is input to the input terminal(H), and the pilot lamp(LED1) of red color is turned on. When an off-switch is turned on, a power is input to the input terminal(P), and the pilot lamp of green color is turned on. When other situation than the on/off occurs, a power is input to both the input terminals(H,P). Accordingly, both the two pilot lamps(LED1,LED2) are all turned on.
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