A power device for an automotive vehicle includes an interlock switch 1,
a crash sensor 2 for detecting an impact of an automotive vehicle, an interlock
relay 3 controlled and turned ON and OFF by the interlock switch 1,
and a contactor 4 for interrupting an output circuit 11 when the
interlock relay 3 is turned OFF. In the power device, when the interrupting
signal is outputted from the crash sensor 2, or when the interlock switch
1 is turned OFF from ON, the contactors 4 are turned OFF to interrupt
the output circuit 11. Further, the power device has a switching element
6 connected to exciting coils 4a of the contactors 4
in series and is turned ON and OFF by an interrupting signal from the crash sensor
2. When the crash sensor 2 outputs the interrupting signal, the contactors
4 are turned OFF by the switching elements 6.