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Safe and reliable delay switch circuit

2015-09-21 13:22  
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Safe and reliable delay switch circuit
It should use the safe and reliable delay switch circuit shown as the chart in the places with flammable and explosive materials. After pressing button S anda certain time, therelay is cut off. If in a given time, therelay doesn't release, so indicator La isextinguished and sent out the fault signal. Technical parameters: Working voltage: 24V; delay time(adjusted by R4): 3~15s.

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