Omron MY4IN 48/50VAC (S) Miniature Power Relay

The Omron MY4IN 48/50VAC (S) miniature power relay is a compact plug-in relay developed for industrial AC control systems. It is part of Omron’s MY relay family and is designed for applications that require dependable multi-pole switching, clear visual indication, and easy socket-based replacement.

Technical Overview

This model uses a 48/50 VAC coil and a 4PDT contact configuration. A commonly listed coil resistance value for this voltage class is approximately 788 ohms, while the relay format is plug-in and socket mounted. The four changeover contacts allow one control signal to switch several independent circuits, which is valuable in automation panels, control cabinets, and relay logic systems.

Functional Advantages

The operation indicator provides a fast visual check of coil status. The latching lever helps maintenance teams perform controlled testing during commissioning, provided that the machine’s safety procedures permit manual operation. The transparent relay case also supports quick inspection in crowded panels.

Typical Applications

The Omron MY4IN 48/50VAC (S) miniature power relay is often used in machinery controls, industrial signaling, electrical interlocking, auxiliary switching, and panel upgrades where a 48 VAC control supply is present. Its plug-in construction reduces downtime because the relay can be replaced without disconnecting every wire from the control circuit.

Engineering Considerations

When specifying this relay, confirm the coil supply tolerance, contact current, load type, socket type, ambient temperature, and applicable standards. Resistive loads are easier to switch than inductive loads. Solenoids, contactor coils, and transformers may need suppression to reduce contact wear and electromagnetic interference. For additional reference, visit Omron relay information.

Omron MY4IN 48/50VAC (S) FAQ

What is the coil voltage of Omron MY4IN 48/50VAC (S)?

It is designed for 48/50 VAC coil operation, making it suitable for AC control circuits in industrial panels.

What contact form does this relay use?

It uses a 4PDT contact form, giving four independent changeover contacts controlled by one coil.

Why choose a plug-in relay?

A plug-in relay reduces maintenance time. If replacement is needed, the relay body can be removed from its socket without rewiring the full circuit.

Does the relay include a manual test feature?

Yes. The MY4IN (S) style includes a latching lever, which can assist during safe testing and commissioning.

Is this relay suitable for PLC interface circuits?

Yes, when the PLC output and relay coil voltage are compatible. Load ratings and suppression requirements should always be checked before use.