Omron MY3 48VDC General Purpose Relay Technical Guide
The Omron MY3 48VDC general purpose relay is a plug-in miniature power relay for control systems that use a 48 VDC coil supply. While 24 VDC is common in many automation panels, 48 VDC is also used in telecom equipment, battery-backed control systems, energy systems, industrial cabinets, and specialized machine controls. The MY3 layout gives designers three-pole changeover switching in a compact, socket-mounted relay body.
Omron MY3 48VDC Technical Specification Overview
Omron’s MY series documentation identifies MY3 as a plug-in terminal relay with three poles and single contacts. The general MY contact rating table includes 5 A at 250 VAC for resistive AC load and 5 A at 30 VDC for resistive DC load under listed conditions. :contentReference[oaicite:8]{index=8}
For the 48 VDC coil class in the MY3 specification group, Omron lists approximately 18.5 mA rated current and 2,600 ohms coil resistance. The coil inductance values are listed as 10.6 H with the armature off and 21.0 H with the armature on. As with other DC coil versions, the must-operate voltage is 80% maximum of rated voltage, while the must-release voltage is 10% minimum. :contentReference[oaicite:9]{index=9}
Application Value of a 48 VDC Coil
A 48 VDC relay is chosen when the control architecture already uses a 48 VDC supply. This can reduce the need for additional power conversion and keep relay control aligned with the broader system voltage. In battery-supported equipment, 48 VDC is often preferred because it can deliver useful power with lower current than 24 VDC systems, helping reduce wiring losses in certain designs.
The 3PDT contact arrangement gives the Omron MY3 48VDC relay strong flexibility. One relay can route three separate signals, isolate three circuits, or coordinate several auxiliary functions at once. This is helpful in control logic, status indication, alarm routing, interlock chains, and equipment enable circuits.
Installation and Engineering Considerations
Correct relay selection should include the coil voltage, coil polarity expectations, socket type, load voltage, load current, and electrical life requirements. Since DC control systems may include inductive devices, designers should evaluate whether flyback diodes, surge absorbers, or other protection methods are needed elsewhere in the circuit. The relay should also be installed in a suitable enclosure with attention to heat, vibration, wiring clearance, and service access.
For broader product context, visit Omron industrial relay components.
FAQ
What is the Omron MY3 48VDC relay?
It is a three-pole, plug-in general purpose relay from the Omron MY series with a 48 VDC operating coil.
Where is a 48 VDC relay typically used?
It may be used in telecom systems, battery-backed panels, energy equipment, industrial control cabinets, and automation systems built around a 48 VDC control supply.
Omron MY3 48VDC What is the coil current of the MY3 48VDC?
Omron lists the 48 VDC MY3 coil current at approximately 18.5 mA in the relevant MY3 specification group.
What does 3PDT provide in practical terms?
It provides three independent changeover contacts, allowing one relay coil to control three separate switching paths.
Can this model be used instead of a 24 VDC relay?
No. The coil voltage must match the control supply. A 48 VDC relay should not be installed in a 24 VDC circuit unless the design is changed and verified.
Why use a socket-mounted relay?
Socket mounting simplifies replacement, improves panel organization, and allows maintenance personnel to change the relay without disturbing fixed wiring.