Omron MY4N1-D2 24VDC (S) Miniature Power Relay Explained

The Omron MY4N1-D2 24VDC (S) miniature power relay is a 24 VDC plug-in control relay designed for industrial automation environments where contact reliability, clear status indication, and coil protection are important. It belongs to Omron’s MY relay family and is widely used in control panels, PLC interface systems, machine control circuits, and sequence control applications.

The “D2” designation is important because it indicates built-in diode coil surge absorption. This makes the relay especially relevant in DC control systems where suppressing coil-generated voltage spikes can help protect sensitive output devices, including PLC transistor outputs and electronic control modules.

Core Technical Features

Omron’s official MY4N-D2 DC24 data identifies the relay as a miniature power relay with four poles, single contacts, plug-in terminals, a built-in diode for coil surge absorption, an operation indicator, and a 24 VDC coil. It also lists 4PDT contact form, Au-clad silver alloy contact material, 24 VDC coil rating at 36.3 mA, coil resistance of 662 ohms, and socket mounting. :contentReference[oaicite:3]{index=3}

For the MY4N1-D2 24VDC (S) variant, distributor specifications describe a plug-in 14-pin 4PDT relay with reverse coil polarity, 5 A rated carry current, mechanical and LED indicators, coil suppressor, label facility, and 24 VDC coil voltage. :contentReference[oaicite:4]{index=4} These features make it suitable for modern cabinet layouts where diagnostics, organized labeling, and component-level protection all matter.

Why Diode Suppression Matters

When a DC relay coil is de-energized, the collapsing magnetic field can generate a voltage spike. A built-in diode provides a path for this energy and helps reduce electrical stress on the driving circuit. In practical terms, this can support longer service life for control outputs and reduce unwanted electrical noise inside the panel.

However, diode suppression also makes coil polarity important. The relay must be wired according to its polarity marking. Incorrect polarity may prevent proper operation or interfere with the protection function. This is one of the key differences between the Omron MY4N1-D2 24VDC (S) miniature power relay and non-suppressed versions.

Typical Applications

This relay is suitable for PLC output isolation, auxiliary machine logic, alarm systems, motor starter control circuits, pump panels, conveyor systems, packaging equipment, and process control panels. Its 4PDT contact structure allows one relay coil to control several independent circuits, which is valuable when feedback, signaling, permissive logic, and load switching must happen together.

The plug-in format also supports fast replacement. In a production environment, a technician can remove the relay from its socket and install a matching replacement without disturbing field wiring. That is particularly useful in facilities where downtime must be minimized.

Selection Notes

Before choosing this relay, confirm the coil voltage, socket type, contact current, load category, polarity, suppression requirement, and control output compatibility. For more Omron relay and automation component information, visit Omron relay solutions.

Omron MY4N1-D2 24VDC (S) FAQ

What makes the Omron MY4N1-D2 24VDC (S) different from the standard MY4N1 version?

The main difference is the built-in diode surge suppression. The D2 version is intended for DC coil circuits where suppressing coil voltage spikes is beneficial for electronic drivers and PLC outputs.

Is polarity important for this relay?

Yes. Because the relay includes diode suppression, coil polarity must be observed. Incorrect wiring can stop the coil from operating correctly or compromise the protection function.

What contact configuration does it use?

It uses a 4PDT contact configuration. This gives four independent changeover contact sets operated by one coil.

Omron MY4N1-D2 24VDC (S) Can this relay switch AC and DC loads?

Yes, MY series relays are commonly rated for both AC and DC switching, but the exact load current depends on whether the load is resistive or inductive. Always verify the applicable rating for the load type.

Why is the LED indicator useful?

The LED indicator helps maintenance personnel quickly confirm whether the coil is energized. This is useful during commissioning, troubleshooting, and routine control panel inspection.

Is the Omron MY4N1-D2 24VDC (S) suitable for PLC panels?

Yes. It is especially suitable for 24 VDC PLC control panels, provided the PLC output can supply the coil current and the wiring follows the relay’s polarity requirements.