This 40A single phase Solid State Relay steps up the current rating for heavier resistive elements and cartridge heaters, while keeping the same DC-controlled, economical design as the rest of Novus's SSR range. Controlled by 3-32VDC, it switches AC loads from 40-480VAC at up to 40A.
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
DC Control: 3-32 Vdc
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
Does 40A need a heatsink?
Yes — at this current rating a heatsink is strongly recommended for continuous duty to keep the SSR within its safe operating temperature.
Will this work with a non-Novus controller?
Yes — this is a universal DC-controlled SSR, triggered by any 3-32VDC signal within its input range. It's not limited to Novus controllers and works equally well with other brand temperature controllers, PLCs, and process controllers.
Is there an AC-input control version instead of DC?
Yes — see our 40A AC-input control model (90-280VAC) if your control signal is AC rather than DC.
Industry Applications
- Industrial Ovens & Kilns — handles higher-current heating elements directly.
- Process Heating — clean, silent switching for demanding thermal cycles.
- OEM Machinery — mid-range current rating suits most standard industrial heater circuits.