Omron MY4IN-D2 48VDC (S) Miniature Power Relay Guide
The Omron MY4IN-D2 48VDC (S) miniature power relay is designed for control systems that operate with a 48 VDC control supply. This voltage is often found in industrial equipment, energy systems, telecom-related cabinets, battery-backed control circuits, and specialized automation panels. The relay combines 4PDT switching, plug-in mounting, an LED operation indicator, a latching lever, and diode-based coil surge absorption.
Electrical Characteristics
The coil rating is 48 VDC with a coil current of approximately 18.8 mA and a coil resistance of 2,560 ohms. The operate voltage is listed at 80 percent maximum of rated voltage. Because the coil current is lower than 12 VDC and 24 VDC versions, it can be a logical choice in systems where the available control voltage is higher and current consumption must remain controlled.
The built-in diode is a valuable protection feature for DC control circuits. When the relay coil turns off, the collapsing magnetic field can produce a transient voltage. The diode helps absorb this surge, reducing stress on upstream switching devices. This is especially relevant when the relay is driven by transistorized outputs, electronic controllers, or DC switching modules.
Contact Arrangement and Ratings
This model uses a 4PDT contact arrangement, enabling four independent changeover circuits to operate from one coil. Contact material is Au-clad plus Ag alloy. Rated loads include 250 VAC at 3 A for resistive AC 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. These values make the relay suitable for control-level switching, auxiliary signaling, alarm routing, interlocks, and interface circuits.
Practical Engineering Considerations
The Omron MY4IN-D2 48VDC (S) should be installed with correct coil polarity because the integrated diode is direction-sensitive. The plug-in design helps reduce downtime by allowing relay replacement through the socket rather than full rewiring. Its LED indication also reduces diagnostic time, especially in densely populated control panels.
Omron MY4IN-D2 48VDC (S) For additional Omron relay details, visit Omron component information.
FAQ
Where is a 48 VDC relay typically used?
A 48 VDC relay is often used in systems with battery-backed control power, telecom-style equipment, energy storage panels, industrial cabinets, and automation systems designed around 48 VDC control architecture.
What does the D2 designation indicate?
In this context, D2 identifies a relay version with diode surge absorption across the coil. This helps protect electronic output circuits from reverse voltage transients.
Omron MY4IN-D2 48VDC (S) Is this relay suitable for PLC output circuits?
Yes, when the PLC output voltage, current capacity, wiring polarity, and relay coil requirements match. The diode can be helpful for transistor outputs, but polarity must be respected.
What is the benefit of 4PDT switching?
4PDT switching allows four separate circuits to change state at the same time. This is useful for multi-signal control, feedback routing, interlocking, and panel logic.
Can this relay switch high-power loads directly?
It is intended for control and moderate switching duties within its specified ratings. For larger motors, heaters, or heavy inductive loads, it should typically drive a contactor or appropriate power switching device.