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Is there a way to detect if the load is conected on the circuit above? (The other load should be connected to the F Pad, sorry for the mistake).

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  • \$\begingroup\$ Put a resistor in series with the output, check if there is a voltage across it. \$\endgroup\$ – dim Mar 1 '18 at 12:52
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    \$\begingroup\$ Are you sure that both LOAD terminals should be connected to the N terminal ... ? \$\endgroup\$ – brhans Mar 1 '18 at 12:58
  • \$\begingroup\$ You are right, one is connected to the F pad \$\endgroup\$ – Tulio Souza Mar 1 '18 at 13:05
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schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Current indicator.

Something like this may work depending on your load current. The diode bridge will drop about 1.4 V at a reasonable current and this should be enough to light an infrared LED as found in an opto-coupler. I've shown two arranged back to back so that a pulse could be detected on each half-cycle.

I have not tried it.

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Figure 2. A current transformer and indicator lamp.

Devices such as that in Figure 2 are a safer means of accomplishing the task. In this case the visible LED can be replaced by an opto-isolator LED but get a back-to-back type or put a reverse diode in parallel so that there is a current path on both half-cycles.

The othe

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