Solid-state Relays Output Short-circuit Malfunction 2: What causes a Solid-state Relays output to short-circuit?

An overcurrent flowed through the Solid-state Relays output and damaged the output elements.

Possible Causes:

1. A short-circuit occurred due to condensation, deterioration of load insulation, temporary short-circuit, or human error.

2. Solid-state Relays were connected to a load with high inrush current, or the current flow within the circuit configuration exceeded the rated withstand surge current for each Solid-state Relays.

3.  surge voltage was caused by the load power supply, or other loads connected to the load power supply line.

4. Solid-state Relays were used for an extended period of time in an environment subject to temperature increases.

   The rated ON current depends on the ambient operating temperature, type of Solid-state Relays, and whether it has a heat sink. (Refer to information on the load current vs. ambient temperature rating for each Solid-state Relays.)

   The heat radiation efficiency depends on how the Solid-state Relays were mounted to the control panel. (Refer to information on mounting Solid-state Relays.)