IDEC RH2B-ULAC110-120V Relay

The IDEC RH2B-ULAC110-120V is a heavy-duty DPDT (2 Form C) industrial relay, engineered for high-density switching in HVACR control panels and automation systems. As a direct, updated replacement for the RH2B-ULAC120V and RH2B-UAC120-L, this 10 Amp power relay features AgCdO (Silver Cadmium Oxide) contacts to resist welding under inductive loads like solenoids or small motors. The RH series compact midget size saves critical DIN rail space while maintaining a high switching capacity. This model is equipped with an LED indicator for immediate visual diagnostics of the 110-120Vac coil status. Designed with standard blade terminals (0.187" quick-connect), it ensures a secure mechanical connection in SH2B-05 or compatible relay sockets. With an operating temperature range of -25 to +70°C and UL/CSA/TUV approvals, it is built to handle the thermal cycling and vibration typical of industrial mechanical rooms and air handling units.

Key Benefits for Technicians:

• Broad Compatibility: Seamlessly replaces legacy RH2B-ULAC120V and RH2B-UAC120-L units without wiring modifications.
• Enhanced Diagnostics: Integrated mechanical indicator and LED light allow for rapid troubleshooting of control circuit issues.
• Compact Footprint: Midget size allows for increased I/O density in crowded electrical enclosures.
• Robust Contact Rating: 10A switching capacity handles both 120VAC and 30VDC loads reliably.
• Industry Standard Mounting: Fits standard plug-in sockets for fast field replacement and reduced downtime.

Common Questions:

Can I use this relay to replace the older RH2B-UAC120-L model?
Yes, the RH2B-ULAC110-120V is the current updated version. It maintains the same DPDT contact configuration and blade terminal layout, ensuring a drop-in fit for existing sockets.

What is the purpose of the 'L' in the part number?
The 'L' signifies an internal LED indicator. This is critical for HVAC technicians to verify that the 120V control signal is reaching the coil without needing a multimeter for every check.

Will this relay work in high-vibration environment near compressors?
The RH series is rated for vibration resistance up to 55Hz (0.5mm amplitude), making it suitable for HVACR equipment, provided it is seated firmly in a quality DIN rail socket with a hold-down clip.

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.