Omron MY4IN-D2 12VDC (S) Miniature Power Relay Guide
The Omron MY4IN-D2 12VDC (S) miniature power relay is a compact 4-pole plug-in relay designed for control panels, sequence control circuits, interface panels, and industrial automation systems where reliable signal switching is required. Built around a 12 VDC coil, this relay is especially useful in low-voltage DC control environments, including PLC output interfaces, machinery control cabinets, alarm circuits, and auxiliary control logic.
Omron MY4IN-D2 12VDC (S) Technical Overview
This model uses a 4PDT contact arrangement, also known as 4 Form C, allowing four independent changeover contacts to be controlled from one coil. Its plug-in terminal structure supports service-friendly installation when used with compatible MY series sockets. The relay includes an LED operation indicator, making visual status checks much easier during maintenance, troubleshooting, or commissioning.
The coil is rated at 12 VDC with a coil current of approximately 75 mA and a coil resistance of 160 ohms. The operate voltage is specified at 80 percent maximum of rated voltage, which helps engineers plan dependable actuation under real cabinet conditions. The built-in diode for coil surge absorption is a key feature of this D2 version. It helps suppress reverse voltage generated when the coil is switched off, protecting transistor outputs and other sensitive DC control devices.
Contact Ratings and Application Fit
The relay contact material is Au-clad plus Ag alloy, offering a practical balance between signal reliability and power switching capability. Rated contact loads include 250 VAC at 3 A for resistive loads, 250 VAC at 0.8 A for inductive AC loads, 30 VDC at 3 A for resistive DC loads, and 30 VDC at 1.5 A for inductive DC loads. This makes the relay suitable for pilot lamps, interlock circuits, auxiliary motor controls, solenoid interfaces, and signal switching tasks.
Installation Notes
Because this is a DC relay with an integrated diode, coil polarity must be observed. Incorrect polarity may prevent proper operation and can affect the protection function. The closed-cover construction supports use in control panels, while socket mounting allows quick replacement without rewiring the entire circuit. Compatible socket families include common Omron PY and PYF series socket options.
Omron MY4IN-D2 12VDC (S) For related Omron relay references, visit Omron product information.
Omron MY4IN-D2 12VDC (S) FAQ
What is Omron MY4IN-D2 12VDC (S) used for?
It is used for switching multiple control circuits from a single 12 VDC coil signal. Typical applications include automation cabinets, machine control panels, PLC output isolation, sequence control, alarm circuits, and auxiliary relay logic.
What does 4PDT mean on this relay?
4PDT means four-pole double-throw. The relay has four separate changeover contacts, each with common, normally open, and normally closed terminals. This allows one coil to control four independent circuits at the same time.
Why does this relay include a diode?
The built-in diode suppresses coil surge voltage when the relay is de-energized. This is important when the relay is driven by transistor outputs, PLC modules, or other electronic switching devices.
Can it switch AC and DC loads?
Yes. The relay can switch both AC and DC loads within its rated limits. Load type matters, because inductive loads reduce the allowable current compared with resistive loads.
Is this relay suitable for socket mounting?
Yes. It is a plug-in relay intended for socket mounting, which simplifies replacement, inspection, and panel maintenance.