Omron MY4IN-D2 24VDC (S) Miniature Power Relay Guide
The Omron MY4IN-D2 24VDC (S) miniature power relay is widely used in industrial automation because 24 VDC is one of the most common control voltages in modern panels. This relay provides 4PDT switching, plug-in installation, an LED operation indicator, and a built-in diode for coil surge suppression. It is a practical component for PLC interfaces, machine safety support circuits, process control panels, packaging equipment, and general-purpose control systems.
Core Technical Features
The relay has a 24 VDC coil rated at approximately 37.7 mA, with a coil resistance of 636 ohms. The operate voltage is 80 percent maximum of rated voltage, supporting reliable response when the control supply is properly designed. The integrated LED indicator helps maintenance teams confirm relay energization without using test instruments for every basic inspection.
The D2 configuration includes diode coil surge absorption. This feature is particularly important when the relay coil is energized by PLC transistor outputs, solid-state outputs, or control boards. When a relay coil is switched off, stored magnetic energy can create a voltage spike. The diode helps clamp that spike and reduce electrical stress on the driving circuit.
Contact Structure and Load Capability
This relay uses a 4PDT contact form with single contacts made from Au-clad plus Ag alloy. It is rated for 250 VAC at 3 A on resistive loads, 250 VAC at 0.8 A on inductive AC loads, 30 VDC at 3 A on resistive DC loads, and 30 VDC at 1.5 A on inductive DC loads. These ratings make it suitable for relay logic, control signal routing, pilot devices, small solenoids, auxiliary circuits, and interposing relay functions.
Where This Relay Fits Best
In many automation projects, the Omron MY4IN-D2 24VDC (S) is selected when several control circuits need to be switched from one 24 VDC command signal. Its 14-pin plug-in format supports organized panel wiring and easier future replacement. The latching lever and visual indication are useful during commissioning, because technicians can quickly verify operation and circuit response.
Omron MY4IN-D2 24VDC (S) For related Omron relay information, visit Omron technical resources.
Omron MY4IN-D2 24VDC (S) FAQ
Why is the 24 VDC version common in control panels?
Many PLCs, sensors, safety relays, and control power supplies use 24 VDC. This makes the relay easy to integrate into standard industrial control architecture.
Omron MY4IN-D2 24VDC (S) What is the purpose of the LED indicator?
The LED shows when the relay coil is energized. It helps operators and technicians confirm control signal presence during troubleshooting and commissioning.
Does the diode affect wiring?
Yes. Since the diode is polarity-sensitive, the positive and negative coil terminals must be connected correctly. Reversed polarity can prevent normal operation.
Can this relay replace a non-diode version?
It can often replace a similar MY series relay if the coil voltage, contact ratings, pin layout, and socket compatibility match. However, polarity and circuit design must be checked.
Is it suitable for inductive loads?
Yes, within its inductive load ratings. Inductive loads such as solenoids and contactor coils should always be reviewed against the specified current and voltage limits.