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General Purpose Relays Relay Plug-In SPDT 10A 120VAC


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Overview of RH1B-ULAC120V

The RH1B-ULAC120V is a power relay with a 120V AC coil voltage, designed for high-reliability switching applications in electrical systems. This relay offers dependable performance and robust construction, making it suitable for a wide range of industrial and commercial applications.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • COM: Common terminal
  • NO: Normally Open terminal
  • NC: Normally Closed terminal
  • Coil A: One end of the coil winding
  • Coil B: Other end of the coil winding

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the RH1B-ULAC120V relay for a visual representation.

Key Features

  • High Reliability: The RH1B-ULAC120V relay offers high reliability and long-term performance in switching operations.
  • 120V AC Coil Voltage: Designed to operate with a 120V AC coil voltage, suitable for standard power supply systems.
  • Durable Construction: With a rugged design, this relay is built to withstand harsh environmental conditions and repeated switching cycles.
  • Compact Size: The compact size of the RH1B-ULAC120V allows for space-saving installation in various applications.
  • Wide Application Range: Suitable for a broad range of industrial, commercial, and residential switching tasks.

Note: For detailed technical specifications, please refer to the RH1B-ULAC120V relay datasheet.


  • Automation Systems: Ideal for use in automation systems for controlling various electrical loads.
  • HVAC Systems: Suitable for HVAC (Heating, Ventilation, and Air Conditioning) applications requiring reliable switching.
  • Industrial Control: Used in industrial control systems for switching motors, lights, and other equipment.


The RH1B-ULAC120V relay is designed to provide reliable and efficient switching of electrical loads in diverse applications, ensuring smooth operation and system control.

Usage Guide

  • Coil Connection: Connect one end of the coil to Coil A and the other end to Coil B for proper energization.
  • Load Connection: Connect the electrical load to the Common (COM), Normally Open (NO), and Normally Closed (NC) terminals as per the switching requirements.
  • Control Signal: Apply the necessary control signal to energize or de-energize the relay for switching operations.

Frequently Asked Questions

Q: Can the RH1B-ULAC120V relay be used in 240V AC systems?
A: No, the RH1B-ULAC120V is designed specifically for 120V AC coil voltage systems. For 240V applications, a suitable relay with a higher voltage rating should be used.

Q: Is the RH1B-ULAC120V relay suitable for continuous duty applications?
A: Yes, the RH1B-ULAC120V relay is designed for continuous duty applications where it may need to switch loads repeatedly over extended periods.


For similar functionalities, consider these alternatives to the RH1B-ULAC120V relay:

  • RH2B-UDC24V: A relay with a 24V DC coil voltage, offering similar reliability and performance characteristics.
  • G2R-1A-E-DC24: This is a 24V DC relay from Omron, providing reliable switching capabilities for various applications.


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Product Category General Purpose Relays RoHS True
REACH Details Product Power Relays
Type Compact Coil Voltage 120 VAC
Relay Contact Form 1 Form C (SPDT-NO, NC) Contact Current Rating 10 A
Contact Termination Plug In Mounting Style Panel Mount
Switching Voltage 220 VAC, 30 VDC Coil Type Non-Latching
Coil Resistance 8.1 kOhms Coil Current 8.6 mA
Contact Material Silver Cadmium Oxide (AgCdO) Series RH
Length 27.5 mm Width 14 mm
Height 35.6 mm Brand IDEC
Contact Rating 10 A Power Consumption 800 mW
Product Type General Purpose Relays Factory Pack Quantity 1
Subcategory Relays

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