How to calculate the Heat

How to calculate the Heat

At first, we should know that there is no one-to-one correspondence between the model (type) of the heat sink and the model (type) of the solid state relay or module. Since solid-state relays use transistors as electronic switching components/power components, the heat generated by the solid state relay or module is mainly related to the actual current of the load it drives, instead of its own rated current specification (current grade).

The heat generated by the solid state relay/module in practical applications can be calculated by the following formula:
1. Heat = Actual Load Current (Amps) * 1.5 W/Amps

Note: The above formula is suitable for single phase solid state relays, single phase AC voltage regulator modules, and R series solid state voltage regulators. For three phase solid state relays and three phase AC voltage regulator modules, the actual load current should be the sum of the actual load currents.

2. Heat = Actual Load Current (Amps) * 3.0 W/Amps

Note: The above formula is suitable for single phase fully-controlled bridge rectifier module.