Omron MY4IN-CR-GS-R AC220/240 Plug-In Relay: Technical Features and Applications

The Omron MY4IN-CR-GS-R AC220/240 plug-in relay is a general-purpose industrial relay designed for control circuits that operate with 220/240 VAC coil voltage. It is part of Omron’s MY-GS relay range, a long-established relay platform used in control panels, factory automation, machine interfaces, HVAC systems, and electrical distribution auxiliaries.

This model is specified as a plug-in, 14-pin, 4PDT relay with a 6 A rated carry current, mechanical and LED indicators, coil surge absorption, and a lockable push test button. :contentReference[oaicite:2]{index=2} These features make it suitable for applications that require multi-circuit switching, visible operating status, and practical maintenance access inside industrial enclosures.

Electrical Design and Contact Structure

The relay uses a 4PDT contact arrangement, also known as four Form C changeover contacts. This allows one coil to control four independent switching paths. In automation systems, this can be useful for separating control signals, switching indicator circuits, enabling auxiliary logic, or coordinating different parts of a machine sequence.

The rated carry current is 6 A, and the relay uses silver contact material. The plug-in 14-pin structure supports organized wiring through compatible sockets, reducing downtime during replacement and simplifying panel service. Instead of rewiring a relay body directly, technicians can remove and replace the relay from its socket when maintenance is required.

220/240 VAC Coil for Industrial Control Panels

The AC220/240 coil version is intended for systems where mains-derived AC control voltage is used. This voltage class is common in industrial panels, building equipment, pump controls, compressor circuits, and machine control systems. Selecting the correct coil voltage is essential because relay coils are designed for a specific operating voltage range. Using the wrong coil voltage can result in failure to operate, overheating, or shortened service life.

The CR surge absorption circuit is a major advantage in this version. When an AC relay coil is switched off, voltage transients can occur. The integrated CR circuit helps suppress these transients, supporting cleaner control behavior and reducing stress on nearby control devices such as PLC outputs, timers, sensors, and interface modules.

Visual Monitoring and Manual Testing

Omron’s MY relay family is designed with maintenance visibility in mind. This model includes both LED and mechanical indication. The LED helps confirm that the coil has been energized, while the mechanical indicator allows a user to visually confirm relay operation. Omron also identifies AC coil relay indication with a red LED and DC coil relay indication with a green LED in the MY family. :contentReference[oaicite:3]{index=3}

The lockable push test button is useful during commissioning, fault tracing, and routine panel checks. It allows engineers to manually operate the relay contacts under controlled conditions. This can help confirm wiring, verify downstream load behavior, and speed up functional testing without replacing components unnecessarily.

Omron MY4IN-CR-GS-R AC220/240 Common Application Areas

The Omron MY4IN-CR-GS-R AC220/240 plug-in relay is commonly used in control cabinets, industrial automation systems, production machinery, HVAC panels, pump control circuits, lighting control interfaces, and auxiliary alarm circuits. Its combination of 4PDT switching and coil surge absorption makes it especially suitable for systems where several control actions must be coordinated from one relay coil.

For projects involving Omron relay families, sockets, and automation components, see more Omron information.

Omron MY4IN-CR-GS-R AC220/240 Frequently Asked Questions

What is the Omron MY4IN-CR-GS-R AC220/240 plug-in relay?

It is a 14-pin industrial electromechanical relay with a 220/240 VAC coil, 4PDT contacts, 6 A rated carry current, LED indication, mechanical indication, a lockable test button, and coil surge absorption.

What does the CR feature do?

The CR feature provides coil surge absorption. It helps reduce electrical transients when the AC coil is switched off, which can support more stable operation in control panels with sensitive components.

Can this relay switch multiple circuits?

Yes. The 4PDT contact structure allows four independent changeover circuits to be switched by one coil. This is helpful in machine control, auxiliary signaling, interlock systems, and control logic applications.

Why is the lockable push test button useful?

The test button allows manual relay operation during troubleshooting and commissioning. The lockable design helps technicians perform controlled checks while observing circuit response and indicator status.

Is this relay suitable for DIN rail panels?

The relay itself is plug-in mounted and is typically used with compatible Omron sockets. When paired with suitable DIN rail sockets, it can be integrated neatly into industrial control cabinets.