Solid State Relay 3-phase 25A (40A)

The solid-state relay is a contactless switch that consists of a collection of semiconductor components. It has several advantages such as fast switching speed, high operating frequency, long lifespan, low noise, reliable operation, and no sparking. It is not only a replacement for electromechanical relays but is also widely used in digital program control units, motor control units, temperature regulation units, data processing systems, and computer terminal interface circuits. It is particularly suitable for configurations that require frequent operation, explosion-proofing, moisture, and corrosion resistance.

The solid-state relay is designed for a current load of 25A and up to 40A depending on cooling. When used for current loads over 10A, a heatsink must be attached.

When using inductive loads, be aware that high transient voltages and surge currents may be applied to the product output, which can cause the solid-state relay to malfunction or be damaged. It is usually necessary to connect components with specific clamping voltages at the output to protect the product, e.g., a varistor (MOV). It is recommended that the varistor voltage be 1.6 to 1.9 times the rated voltage.

The output terminals of multiple solid-state relays are not to be used in parallel to attempt to increase the output current. However, the output terminals can be used in series to accommodate higher operating voltages.