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I have a Crydom solid state relay #-D1202 ,?
when it is switched off i still have voltage(18 volts) on the output, it is rated at 120 v 2.5 amps on the output and the input (control) is 3- 32 volts DC. Im not sure if its just a bad relay , or if the amperage rating is to low . Im using the relay to turn on/off , a small air pump 120 volts / 1.5 watts.
Any help with this would be appreciated
If your load were purely resistive, then the load current would be:
1.5W/120V =12.5mA
But it's basically a solenoid vibrating a flapper valve, so let's assume it has a power factor of 50%. Then the VA draw would be:
1.5W/.5PF =3VA
And the current draw would be:
3VA/120V = 25mA
The spec sheet states that the D1202 has a maximum of 8mA leakage current in the off state. If the full 8mA leaked, you would see about:
120V x (8/25) = 38.4V.
You are seeing 18 volts, so the actual leakage current is closer to 4mA (assuming the 50% power factor).
The bottom line is that the D1202 most likely is working but is leaky. The voltage that you see in the off state is due to normal leakage current, but does represent wasted power.
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