Watlow SSR-240-40G-DC1 Solid State Relay 40A 240VAC 3-32VDC Control w/ Heatsink

Watlow SSR-240-40G-DC1 Solid State Relay 40A 240VAC 3-32VDC Control w/ Heatsink

The Watlow SSR-240-40G-DC1 is a single-phase solid state relay (SSR) rated for 40 amps at 240VAC load voltage, with a 3–32VDC DC control input. It is mounted on a black anodized aluminum heatsink designed to dissipate heat during continuous switching operation. Manufactured by Watlow Controls of Winona, Minnesota, this SSR carries UL listing and is intended for industrial power control applications.

Specifications & What's Included

• Model: SSR-240-40G-DC1
• Part Number: 18-6006
• Type: Solid State Relay (SSR), single-phase
• Load Voltage: 240 VAC
• Load Current: 40 Amps
• Control Input Voltage: 3–32 VDC
• Control Input Type: DC control
• Heatsink: Black anodized aluminum, fin-style
• Heatsink Dimensions: 5.5" x 3.125" x 1.5"
• Certifications: UL Listed
• Manufacturer: Watlow Controls, Winona, MN 55987
• Includes: SSR relay module mounted on aluminum heatsink

Applications

Solid state relays like the Watlow SSR-240-40G-DC1 are used in industrial temperature control, process heating, and power switching applications where a low-voltage DC control signal (from a PLC, temperature controller, or similar device) needs to switch a higher-voltage AC load such as a resistive heater, heating element, or motor. SSRs are preferred over electromechanical relays in these roles because they have no moving parts, switch silently, and offer fast, precise control. Watlow Controls is a well-known manufacturer of thermal and heating control components, and their SSR series is commonly found in industrial ovens, furnaces, plastic processing equipment, packaging machinery, and laboratory temperature control systems. The integrated heatsink is standard for 40-amp-rated SSRs, as these devices generate heat proportional to load current and require thermal management for reliable continuous duty.