Frequently Asked Questions
Do I need a heatsink with this?
Yes, for anything beyond light, intermittent loads — SSRs generate heat proportional to load current and voltage drop. See our pre-assembled SSR + Heatsink version if you'd rather not source and fit one separately.
What control signal does it need?
4-32V DC — compatible with most PLC digital outputs directly, with a minimum input current of 5mA.
What's the difference between this and a mechanical contactor?
SSRs switch electronically with no moving parts, so they're silent, have no contact wear, and can handle much higher switching frequencies — useful for PWM temperature control or high-cycle applications where a mechanical contactor would wear out quickly.
Can I use this for phase-angle or PWM temperature control?
Yes — this is a common choice for driving heating elements from a PID temperature controller's low-voltage output signal.
Industry Applications
- Process heating — PID/PLC-driven temperature control for ovens, extruders, and heated tooling
- Plastics & packaging machinery — high-cycle switching of heater bands without mechanical contact wear
- Motor & pump control — silent, high-frequency switching for variable-duty applications