Frequently Asked Questions
Do I need a heatsink with this?
Yes — at 40A, effective heat dissipation is essential. EMAS's SSS1X/SSS2X heatsinks (or the pre-assembled SSR+heatsink versions) are designed to pair with this relay range for continuous-duty use.
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 different about this vs. the 12A/25A versions?
Same control interface and voltage range, but this handles up to 40A load current with a larger 6mm² load terminal cable section to safely carry the higher current.
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 larger ovens, extruders, and heated tooling
- Plastics & packaging machinery — high-cycle switching of higher-power heater bands without mechanical contact wear
- Motor & pump control — silent, high-frequency switching for higher-current variable-duty applications