Product Overview
Omega SSR240DC25 Solid State Relay Assembly with Extruded Heatsink
Condition
Used. Evaluation: Visual inspection only. Function testing not performed. Screw terminals with pressure clamps are clean and undamaged. The relay is factory-mounted to the extruded aluminum heatsink with thermal compound applied. Markings legible: OMEGA ENGINEERING, INC. MODEL SSR240DC25.
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Product Overview
Solid-state AC power switching meets dedicated thermal management in this panel-mount relay assembly. Rated for line loads up to 25 amps across a nominal 120/240 VAC range, the Omega SSR240DC25 triggers via a 3-32 VDC logic signal to switch power without moving contacts, arcing, or mechanical wear. The finned aluminum heatsink provides continuous heat dissipation for high-duty-cycle temperature control and motor loads.
Key Features
- Control input rating: 3 to 32 VDC via screw terminals 3 (+) and 4 (-)
- Load output rating: 120/240 VAC nominal (24 to 280 VAC operating window), 25 A maximum current
- Switching architecture: Zero-voltage crossing solid-state AC switching
- Terminal design: Heavy-duty screw terminals with captive pressure saddle clamps for secure wire termination
- Heatsink construction: Finned black extruded aluminum with slotted perimeter mounting tabs and pre-applied thermal compound
- Agency standards: CSA certified and UL Recognized component
Applications
- Switches heating elements on environmental test chambers, autoclaves, and injection molding runners via PID temperature controller DC pulse outputs.
- Replaces noisy or worn mechanical contactors in packaging sealing bars and industrial drying tunnels.
- Serves maker and bench projects running high-amperage AC heating coils, coffee roasters, or kiln elements directly from an Arduino or Raspberry Pi logic circuit.
Frequently Asked Questions
What control signal is needed to trigger the relay output?
The relay requires a DC input between 3 VDC and 32 VDC applied across terminals 3 (+) and 4 (-), making it directly compatible with standard PLC digital outputs, PID controllers, and 5V or 3.3V microcontrollers.
Is the heatsink detachable from the relay body?
The relay is secured to the heatsink base using two center machine screws through its baseplate. It can be unbolted if needed, though thermal interface compound is applied between the mating surfaces.
What are the physical dimensions and mounting requirements for installation?
The assembly mounts flat against an electrical backplate or panel wall using the slotted flanges on the corners of the heatsink extrusion. Natural vertical orientation is recommended to promote convective airflow through the cooling fins.
Clean solid-state switching with the heatsink already bolted on, ready to wire straight into your temperature loop.
