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General Purpose Relays Relay Plug-In 3PDT 10A 120VAC


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Overview of RH3B-ULAC120V

The RH3B-ULAC120V is a compact general-purpose relay with a 120V AC coil voltage, designed for various industrial and control applications. This relay provides reliable switching for electrical circuits, offering a versatile solution for automation and control systems.


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

  • A1: Coil terminal 1
  • A2: Coil terminal 2
  • NO: Normally open contact
  • NC: Normally closed contact
  • C: Common contact
  • GND: Ground connection
  • +
  • -

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the RH3B-ULAC120V relay for a visual representation.

Key Features

  • Compact Design: The RH3B-ULAC120V relay features a compact size, suitable for space-constrained applications.
  • 120V AC Coil Voltage: Designed to operate with a coil voltage of 120V AC, compatible with standard industrial power supplies.
  • Reliable Switching: Provides reliable switching of electrical circuits, ensuring long-term durability and performance.
  • High Current Rating: Capable of handling moderate to high current loads, making it suitable for various industrial and control applications.
  • Mounting Options: Available with different mounting options for flexible installation in different equipment and systems.

Note: For detailed technical specifications, please refer to the RH3B-ULAC120V datasheet.


  • Industrial Automation: Ideal for automation systems requiring reliable switching of electrical loads.
  • Control Panels: Used in control panels for controlling motors, lights, and other electrical devices.
  • HVAC Systems: Suitable for use in HVAC (Heating, Ventilation, and Air Conditioning) systems for controlling fans and pumps.


The RH3B-ULAC120V relay is designed to control electrical circuits by opening and closing contacts based on the coil energization status. It provides essential switching functionality in industrial and control applications.

Usage Guide

  • Coil Connections: Connect the A1 and A2 terminals to the 120V AC coil voltage.
  • Contact Connections: Use the NO (Normally Open), NC (Normally Closed), and C (Common) contacts to interface with the controlled circuit.
  • Mounting: Secure the relay using appropriate mounting methods to ensure stability and electrical isolation.

Frequently Asked Questions

Q: What is the maximum current rating of the RH3B-ULAC120V relay?
A: The RH3B-ULAC120V relay typically has a maximum current rating suitable for industrial loads. For precise details, refer to the datasheet.

Q: Can the RH3B-ULAC120V relay be used in control panels?
A: Yes, the RH3B-ULAC120V relay is commonly used in control panels for switching and controlling various electrical devices.


For similar functionalities, consider these alternatives to the RH3B-ULAC120V:

  • G2R-1-E-AC120: A compact general-purpose relay with 120V AC coil voltage and similar switching characteristics.
  • OMRON LY2N-AC120: This is another 120V AC coil voltage relay from OMRON, offering reliable performance for industrial 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 3 Form C (3PDT-NO, NC) Contact Current Rating 10 A
Contact Termination Solder Pin Mounting Style PCB Mount
Switching Voltage 110 VAC, 220 VAC, 30 VDC Coil Termination Solder Pin
Coil Type Non-Latching Coil Resistance 10.8 kOhms
Coil Current 16.4 mA Contact Material Silver Cadmium Oxide (AgCdO)
Series RH Length 31 mm
Width 27.5 mm Height 35.6 mm
Brand IDEC Contact Rating 10 A
Power Consumption 1.5 W Product Type General Purpose Relays
Factory Pack Quantity 1 Subcategory Relays

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