This 40A single phase Solid State Relay is controlled from an AC input signal (90-280VAC) rather than DC — useful when your control source is a PLC or controller with an AC output rather than a DC pulse. It switches AC loads from 40-480VAC at up to 40A, suited to cartridge heaters, resistive elements, and general AC loads.
Solid state relays are used for switching resistive and inductive loads, outperforming conventional mechanical relays with a life cycle measured in millions of operations, high switching speed with no mechanical or electrical noise, no dangerous sparks or wear, and low power needed for switching — a perfect choice when high control accuracy is fundamental.
✅ 1 Year Manufacturer Warranty — backed by our UK-based technical support
Novus SSR-4840 Datasheet Download
Novus SSR-4840 Manual Download
Technical Details
AC Load: 40-480 VAC @ 40A
AC Control: 90-280 Vac
Switching: Zero crossing, optically isolated, dv/dt protection
Indication: Switching status indicator LED
Construction: Secure screw terminals, terminal shield, mounting pad, CE marked
Does not generate EMI/RFI
Frequently Asked Questions
What's the difference between this and the DC-input 40A model?
Only the control signal — this version is triggered by 90-280VAC rather than 3-32VDC. Load rating and all other specs are identical.
Why would I need an AC-controlled SSR?
Useful when your controller, PLC, or relay output is AC rather than DC, so you can drive the SSR directly without an interposing relay or signal converter.
Does this need a heatsink?
Yes — at 40A a heatsink is recommended for continuous duty to keep the SSR within its safe operating temperature.
Industry Applications
- PLC-Controlled Heating Circuits — drives directly from an AC relay or PLC output.
- Industrial Ovens & Kilns — handles higher-current heating elements directly.
- Retrofit Projects — replaces mechanical contactors on existing AC-controlled circuits.