Omron MY4N-D2 100/110VDC (S) Miniature Power Relay Guide

The Omron MY4N-D2 100/110VDC (S) miniature power relay is a plug-in industrial relay designed for DC control systems that use 100 VDC or 110 VDC coil voltage. It is part of Omron’s MY series, a recognized relay family used in control panels, sequence control, power switching, machinery, and automation interface circuits.

This relay is especially relevant in DC control architectures where coil surge suppression is required. The D2 version includes a built-in diode for coil surge absorption, helping reduce voltage spikes that can occur when a DC relay coil is de-energized.

Technical Overview

Omron identifies the MY4N-D2 DC100/110 as a miniature power relay with four poles, single contacts, plug-in terminals, built-in diode for coil surge absorption, and an operation indicator. The coil ratings are listed as 100 VDC at 8.7 mA and 110 VDC at 9.6 mA. The relay uses a 4PDT contact form, single contact method, Au-clad silver alloy contact material, LED operating indicator, diode coil surge killer, closed cover construction, and plug-in terminal structure. :contentReference[oaicite:5]{index=5}

Omron lists the contact rated load as 220 VAC 3 A for resistive load, 220 VAC 0.8 A for inductive load, 24 VDC 3 A for resistive load, and 24 VDC 1.5 A for inductive load. The model also uses socket mounting and has an approximate weight of 35 g. :contentReference[oaicite:6]{index=6}

Why Diode Surge Protection Matters

In a DC relay coil, stored magnetic energy can create a high-voltage spike when the coil is turned off. The built-in diode gives that energy a controlled discharge path. This helps protect PLC outputs, transistor drivers, electronic timers, and other sensitive control devices from unnecessary electrical stress.

Because this relay includes diode suppression, polarity must be observed during installation. The positive and negative coil terminals should be wired according to the relay’s terminal diagram. Incorrect polarity can prevent proper operation or interfere with the protection function.

Common Applications

The Omron MY4N-D2 100/110VDC (S) miniature power relay is used in DC control panels, industrial machinery, power distribution control, railway-related auxiliary systems, process automation, control room panels, and equipment where 100 or 110 VDC control voltage is standard.

Its 4PDT contact arrangement gives designers four independent changeover outputs from one coil. This is useful when a single command signal must manage multiple control paths. For instance, the relay may provide controller feedback, switch an alarm circuit, activate an indicator, and enable another relay or contactor circuit at the same time.

Socket Compatibility and Maintenance

Omron lists applicable socket options for this model, including PYF14S, PYF14T, PYF-14-PU, PYFZ-14, PY14, PY14-Y1, PY14QN, PY14QN2, and related 14-pin socket models. :contentReference[oaicite:7]{index=7} This socket-based design supports clean panel wiring and practical field replacement.

During maintenance, technicians should verify coil voltage, socket type, contact condition, wiring polarity, and load characteristics. The LED indicator helps confirm coil status, while the plug-in structure simplifies replacement when the same specification is used. For more information about Omron relay families, visit Omron industrial relay components.

Omron MY4N-D2 100/110VDC (S) FAQ

What is the Omron MY4N-D2 100/110VDC (S) used for?

It is used in DC control circuits requiring 100 or 110 VDC coil voltage, especially in industrial panels, machine control, auxiliary switching, sequence logic, alarms, and control interface applications.

What does D2 mean in this relay?

D2 indicates built-in diode coil surge absorption. This helps suppress the voltage spike that can appear when the DC coil is switched off.

Is coil polarity important?

Yes. Since the relay includes a diode, coil polarity is important. The coil must be wired according to the correct positive and negative terminal markings.

Omron MY4N-D2 100/110VDC (S) What contact configuration does it have?

The relay has a 4PDT contact configuration. This provides four independent changeover contacts operated by one coil.

Does the relay include an LED indicator?

Yes. Omron lists this model with an LED operation indicator, allowing users to confirm whether the coil is energized.

Can the Omron MY4N-D2 100/110VDC (S) switch AC loads?

Yes, it can switch AC loads within its rated contact limits. Omron lists a 220 VAC resistive load rating, but the final selection must consider load type and current.

Why use a socket-mounted relay?

Socket mounting makes installation and replacement easier. The wiring remains connected to the socket, while the relay can be removed and replaced as a separate component.

What should be checked before selecting this relay?

Confirm the coil voltage, DC polarity, contact rating, contact form, socket compatibility, load type, suppression requirement, operating environment, and maintenance requirements.