Omron MY4ZN1-D2 24VDC (S) Miniature Power Relay Guide

The Omron MY4ZN1-D2 24VDC (S) miniature power relay is a plug-in electromechanical relay designed for general-purpose control and interface duties. It combines a 24 VDC coil, 4PDT bifurcated contact structure, LED operation indication, diode coil suppression, and reverse coil polarity characteristics. This makes it a focused option for control panels where stable signal switching and coil surge management are important.

Technical Overview

This model is part of Omron’s MY relay family and is designed for socket mounting. Its 4PDT contact configuration allows one relay to manage four independent changeover circuits. The bifurcated contact design supports dependable switching in lower-level circuits, while the LED indicator gives a quick visual confirmation that the relay coil is energized.

The D2 designation indicates a built-in diode for coil surge absorption. In DC relay circuits, coil de-energization can create a voltage spike. A diode helps suppress that spike, reducing stress on connected control electronics. This is particularly relevant when the relay is driven by transistor outputs, PLC modules, or other sensitive control devices.

Reverse Coil Polarity Feature

A key distinction of the Omron MY4ZN1-D2 24VDC (S) is its reverse coil polarity configuration. In practical terms, this means wiring polarity must be checked carefully during installation. The feature is important because diode-protected DC relays are polarity-sensitive. Proper wiring helps ensure correct operation and protects the control circuit from unnecessary diagnostic issues.

Where This Relay Fits Best

This relay is well suited for industrial automation panels, PLC interface circuits, alarm logic, control signal distribution, interposing relay applications, and machine status circuits. It can also be useful when a system designer wants both visual operation feedback and integrated coil suppression in a compact plug-in format.

Omron MY4ZN1-D2 24VDC (S) Selection Considerations

Before installation, the system designer should verify coil voltage, contact rating, socket compatibility, polarity, operating temperature, and load type. While the relay is versatile, it should not be treated as a universal replacement without checking the circuit requirements. Inductive loads, long cable runs, and sensitive electronics may require additional design review.

For related relay families, accessories, and Omron automation references, see Omron product information.

FAQ

What is the Omron MY4ZN1-D2 24VDC (S) miniature power relay?

It is a 24 VDC plug-in electromechanical relay with 4PDT bifurcated contacts, LED indication, diode surge suppression, and reverse coil polarity characteristics.

Omron MY4ZN1-D2 24VDC (S) Why does this relay include a diode?

The diode helps absorb coil surge when the relay is switched off. This can reduce voltage spikes and help protect PLC outputs, transistor drivers, and other control electronics.

Is polarity important for this model?

Yes. Because the relay includes a diode and has reverse coil polarity characteristics, wiring polarity must be checked before energizing the coil.

Can this relay be used as an interposing relay?

Yes. It can be used as an interposing relay when the coil voltage, contact rating, socket type, and load conditions are suitable for the application.

What advantage do bifurcated contacts provide?

Bifurcated contacts improve the reliability of low-level signal switching by providing two contact points instead of a single contact surface.