IDEC Relays RH1B-ULAC120V Relay

When you are looking for a reliable miniature power relay to handle 120V AC control circuits, the IDEC RH1B-ULAC120V is a standard-tier choice for industrial panels. This SPDT (1 Form C) relay belongs to the IDEC RH Series, often referred to by techs as a "midget" or ice cube relay due to its compact socket-mount design. It features blade terminals that snap into SH1B-05 or similar DIN-rail sockets, making replacements quick during field service calls. With a 10A contact rating and Silver Cadmium Oxide (AgCdO) contacts, it is built to manage resistive loads, though you should always factor in derating for inductive motors or solenoids. This specific model includes a built-in LED indicator for immediate visual status of the coil, which is a lifesaver when troubleshooting control panel logic. The RH1B-ULAC120V is UL recognized and CSA certified, ensuring it meets the rigorous standards required for HVACR and industrial automation environments.

• High Switching Capacity: Reliable 10 Amp switching in a space-saving "midget" footprint.
• Visual Troubleshooting: Integrated LED indicator allows for rapid verification of coil energization without a multimeter.
• Standardized Mounting: Uses standard blade terminals compatible with widely available DIN rail sockets.
• Durable Construction: Features Silver Cadmium Oxide contacts designed to resist pitting and provide a long mechanical life.
• Compact Profile: Ideal for high-density electrical enclosures and energy management systems where rail space is at a premium.

What is the difference between the RH1B-UL and the standard RH1B?
The "L" in the part number signifies the built-in LED indicator. For 120V AC applications, having the visual indicator is highly recommended for faster diagnostics compared to the non-illuminated versions.

Can I use this relay for motor starting?
While rated for 10A, this is a general-purpose power relay. For 120V inductive loads like small fans or pumps, ensure the inrush current does not exceed the contact specifications. For high-cycle inductive applications, consider a snubber circuit to extend the life of the SPDT contacts.

Which socket is compatible with this relay?
The IDEC RH1B-ULAC120V is designed for use with the SH1B series of sockets (such as the SH1B-05 for DIN rail or surface mounting).

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.