IDEC RU4S-110 Relay

IDEC RU4S-110 Relay – 4PDT 6A Universal Miniature Ice-Cube Plug-In Power Relay

The IDEC RU4S-110 Relay (commonly specified under the IDEC RU Series part numbers RU4S-A110 for AC or RU4S-D110 for DC) is a compact, high-performance 4PDT (4 Pole Double Throw) general-purpose industrial switching relay manufactured by IDEC Corporation. Engineered for ultimate reliability in industrial control systems, automation panels, and power distribution setups, the IDEC RU4S-110 Relay features a $110text{ V}$ operating coil and a robust $6text{ A}$ contact rating.

As shown in the product image, this popular “ice-cube” style relay features a transparent, flame-retardant housing housing a high-visibility green LED status indicator alongside a mechanical flag window. Built using IDEC’s proprietary solderless internal construction, it eliminates internal wiring jumpers, significantly reducing thermal failure points and enhancing durability against shock and vibration.

Key Features of the IDEC RU4S-110 Relay

4PDT Contact Configuration: Packs four sets of changeover contacts ( $4text{ Form C}$ ) into a compact, space-saving $21text{ mm}$ wide plug-in housing.
Environmentally Conscious Design: Manufactured without lead solder and built using cadmium-free gold-clad silver alloy contacts for low contact resistance.
Solderless Internal Connections: Built without internal jumper wires to maximize operational lifespan and withstand heavy mechanical vibration.
Dual Status Indication: Features a non-polarized LED light for coil energization status and a mechanical window flag to visually verify physical armature movement.
Manual Latching/Testing Lever Options: Certain models include a green manual latching lever that allows technicians to test control circuits without energizing the coil.
Marking Plate Slot: Equipped with a standard yellow snap-on marking plate for clear circuit identification in high-density control cabinets.

Common Applications and Industrial Usage of IDEC RU4S-110 Relay

The high contact density and rapid response time ( $20text{ ms}$ ) of the IDEC RU4S-110 Relay make it an ideal choice across diverse industrial automation sectors:

PLC Output Interfacing: Serves as a reliable isolation relay between low-voltage Programmable Logic Controller outputs and high-energy field actuators.
Control Panels & Automation Systems: Used for logic control loops, safety interlocks, and auxiliary switching in motor control centers (MCCs).
Building Automation & HVAC: Interfaced with 110 V control circuits to sequence fans, pumps, dampers, and lighting arrays.
Packaging & Material Handling Equipment: Delivers high-frequency position switching and conveyor drive control in industrial plants.

Technical Specifications of IDEC RU4S-110 Relay

The electrical metrics, coil specifications, and physical properties of the IDEC RU4S-110 Relay conform to UL, CSA, CE, and UKCA safety certifications:

Parameter Specification	Technical Details & Performance Values
Component Classification	4PDT Miniature Plug-In Power Relay
Primary Target Keyword	IDEC RU4S-110 Relay
Coil Nominal Voltage ( $U_c$ )	$110text{ to }120text{ VAC}$ (or $110text{ VDC}$ depending on model variant)
Contact Form	4PDT / 4 Form C ( $4text{ NO} + 4text{ NC}$ )
Rated Contact Current	$6text{ A}$ ( $250text{ VAC} / 30text{ VDC}$ resistive load)
Contact Material	Gold-clad silver alloy ( $text{Ag/Au}$ )
Contact Resistance	$50text{ m}Omega$ maximum
Operating / Release Time	$20text{ ms}$ maximum / $20text{ ms}$ maximum
Dielectric Strength	$2500text{ VAC}$ (between coil and contacts, 1 min)
Mechanical Life Expectancy	Minimum $50,000,000text{ operations}$
Terminal Mounting Style	Blade Terminals / Plug-in (Fits SU4S-05C or SY4S-05C DIN-rail sockets)
Operating Temperature	$-55text{ °C to }+60text{ °C}$

Installation Guidelines and Best Practices

Safety Warning: Always isolate incoming power upstream before inserting or removing relays from socket bases.

Pairing with Sockets: Install the IDEC RU4S-110 Relay into a compatible IDEC 14-pin DIN-rail mounting socket (such as the SU4S-05C or SY4S-05C) and secure it using an SFA-101 retaining clip.

Verify Coil Voltage: Confirm whether your control circuit supplies AC or DC voltage to ensure you select the matching coil variant (RU4S-A110 for AC vs. RU4S-D110 for DC).

Observe Load Limits: Maintain inductive switching loads within specified motor/solenoid limits ( $0.8text{ A}$ at $250text{ VAC}$ ) to maximize contact life.

To review official relay datasheets, socket accessories, and complete RU series electromechanical product documentation, check the global IDEC Industrial Automation Relay Directory.

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