Omron MY4N 125VDC (S) General Purpose Relay Guide
The Omron MY4N 125VDC (S) general purpose relay is a plug-in electromechanical relay designed for control panels, industrial automation systems, interlocking circuits, and multi-contact switching tasks. As part of Omron’s MY series, this relay is commonly selected when engineers need a compact relay with four changeover contacts, visible operation status, and dependable socket-based installation.
What Is the Omron MY4N 125VDC (S)?
The Omron MY4N 125VDC (S) is a 4PDT relay, also described as a 4 Form C relay. This means it provides four independent changeover contacts in one relay body. Each contact can switch between normally open and normally closed paths, making the device useful in circuits where several signals must change state at the same time.
The 125 VDC coil rating makes this version suitable for DC control systems where higher DC control voltage is already available. Typical environments may include control cabinets, machine logic circuits, process equipment, auxiliary control loops, and electrical panels that require reliable isolation between coil input and load contacts.
Key Technical Characteristics
This relay uses plug-in terminals and is intended for socket mounting. The MY4N construction includes an operation indicator, allowing maintenance teams to visually confirm whether the relay coil is energized. The contact arrangement is 4PDT, with single contacts made from gold-clad silver alloy, a material combination often used to support dependable low-level and general control switching.
Typical MY4N contact ratings include 220 VAC at 3 A for resistive loads, 220 VAC at 0.8 A for inductive loads, 24 VDC at 3 A for resistive loads, and 24 VDC at 1.5 A for inductive loads. The maximum contact voltage is commonly listed as 250 VAC or 125 VDC, while maximum switching power reaches 660 VA for resistive AC loads and 72 W for resistive DC loads.
Why the 125 VDC Coil Matters
A 125 VDC coil is not interchangeable with lower-voltage DC coils such as 12 VDC or 24 VDC. Using the correct coil voltage is essential for safe operation, reliable pickup, and stable release. In a system designed around a 125 VDC control supply, the Omron MY4N 125VDC (S) relay can be integrated without adding a separate low-voltage relay supply.
Installation and Application Notes
The relay is designed for plug-in socket use, which helps simplify maintenance. Instead of rewiring an entire control circuit, technicians can remove and replace the relay body from the compatible socket. This is particularly useful in electrical cabinets where downtime must be minimized.
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Common Applications
The Omron MY4N 125VDC (S) is often used in industrial control panels, machine sequence control, auxiliary contact multiplication, alarm circuits, signal routing, motor control logic, and automation systems. Its four-pole design makes it practical where one coil signal must control several separate circuits at once.
FAQ
What type of relay is the Omron MY4N 125VDC (S)?
It is a general purpose plug-in electromechanical relay with a 4PDT contact configuration and a 125 VDC coil.
Can the Omron MY4N 125VDC (S) be used in AC coil circuits?
No. This model is intended for a DC coil supply. For AC control circuits, an AC coil version such as MY4N 12VAC, 24VAC, or 220/240VAC should be selected.
What does 4PDT mean?
4PDT means four pole double throw. The relay provides four separate changeover contacts operated by one coil.
Why is socket mounting useful?
Socket mounting allows easier replacement, cleaner wiring, and faster maintenance in control panels.
Is the indicator important?
Yes. The built-in indicator helps technicians see relay operation status during testing, troubleshooting, and commissioning.
Where is this relay commonly used?
It is commonly used in automation cabinets, control circuits, signal switching, interlock systems, and industrial machine panels.