Omron MY4IN 24VAC (S) Miniature Power Relay

The Omron MY4IN 24VAC (S) miniature power relay is a plug-in industrial relay designed for control panels, sequence control, interlocking circuits, and machine automation. It uses a 24 VAC coil and a 4PDT contact arrangement, making it suitable when several isolated circuits must be switched from one control signal. This model includes an operation indicator and latching lever, which helps technicians check relay status during commissioning and maintenance.

Technical Overview

Key specifications include 24 VAC coil voltage, plug-in terminals, 4-pole single-contact design, LED indication, and socket mounting. The MY4IN family is commonly used with PY-series sockets, allowing fast replacement without rewiring. For four-pole MY relays, contact ratings depend on load type, with resistive AC and DC loads requiring different evaluation. The 4PDT structure is especially useful in auxiliary control circuits where multiple signal paths must change state together.

Where It Is Used

This relay is frequently selected for HVAC panels, packaging machinery, alarm circuits, lighting control, pump panels, and PLC interface applications. A 24 VAC coil is practical in systems where low-voltage AC control transformers are already used. The visible indicator supports quick field diagnosis, while the latching lever allows manual test operation when safe procedures are followed.

Selection Notes

Before installation, engineers should verify coil voltage, contact load, socket compatibility, ambient temperature, and switching frequency. Inductive loads such as solenoids, contactor coils, and small motors may require suppression components to protect contacts and reduce electrical noise. For more brand details, see Omron relay information.

Omron MY4IN 24VAC (S) FAQ

What is the Omron MY4IN 24VAC (S) miniature power relay used for?

It is used for multi-circuit switching in industrial control panels, automation systems, alarm circuits, and auxiliary machine control applications.

Does this relay have an indicator?

Yes. The MY4IN 24VAC (S) version includes an operation indicator, making coil energization easier to identify during troubleshooting.

What does 4PDT mean?

4PDT means four pole double throw. One coil can switch four separate changeover contact sets at the same time.

Is it socket mounted?

Yes. It uses plug-in terminals and is intended for compatible relay sockets, which simplifies replacement and panel maintenance.

Can it switch inductive loads?

Yes, within its rated limits. However, inductive loads should be reviewed carefully because they create arcing and may require contact protection.