Omron MY4 48VDC (S) General Purpose Relay for DC Control Panels
The Omron MY4 48VDC (S) general purpose relay is a compact plug-in electromechanical relay designed for industrial automation, DC control circuits, machine panels, auxiliary switching, and signal isolation. It is part of Omron’s MY miniature power relay series, which is commonly used in control cabinets where reliable switching and easy replacement are important.
This model uses a 48 VDC coil and provides a 4PDT contact configuration. That combination makes it suitable for systems where a 48 VDC control signal must operate several independent contacts at the same time. The relay can be useful in industrial machinery, process control, automation panels, battery-supported systems, and control environments where 48 VDC architecture is standard.
Technical Overview
The Omron MY4 48VDC (S) relay is specified as a miniature power relay with a 48 VDC coil, plug-in terminals, 4PDT contact form, and gold-clad silver alloy contacts. Published Omron data lists the MY4 DC48 with 17.6 mA coil current, 2,725 ohm coil resistance, 80% maximum operate voltage, and rated loads including 3 A at 220 VAC for resistive loads, 0.8 A at 220 VAC for inductive loads, 3 A at 24 VDC for resistive loads, and 1.5 A at 24 VDC for inductive loads.
Why Choose a 48 VDC Relay?
48 VDC control systems are used in many industrial and technical environments because they provide a useful balance between control power, voltage drop performance, and system safety. Compared with lower control voltages, 48 VDC can be advantageous in circuits with longer cable runs or higher control power requirements. The Omron MY4 48VDC (S) general purpose relay allows this control voltage to operate multiple isolated switching paths through one relay coil.
The 4PDT contact arrangement is one of the most important advantages of this relay. Four changeover contacts allow designers to combine several control actions into a single relay operation. This can simplify control logic, reduce the number of separate relays, and improve cabinet organization.
Key Features
- Brand and model: Omron MY4 48VDC (S)
- Product type: General purpose electromechanical relay
- Coil voltage: 48 VDC
- Coil current: 17.6 mA
- Coil resistance: 2,725 ohms
- Contact form: 4PDT
- Terminal structure: Plug-in terminal
- Contact material: Gold-clad silver alloy
Application Guidance
The Omron MY4 48VDC (S) should be used only where the relay coil supply is 48 VDC. It should not be confused with the 48/50 VAC version, as AC and DC coils are not interchangeable. Even when the voltage number is close, the electrical behavior is different.
When switching inductive loads, engineers should review the load characteristics carefully. DC inductive loads can create high-energy voltage spikes when interrupted. Protection methods such as flyback diodes, surge absorbers, or other suppression devices may be required depending on the circuit. Correct protection can extend contact life and improve overall system reliability.
For more Omron relay families, sockets, and industrial control components, see Omron automation components.
FAQ
What is the Omron MY4 48VDC (S) used for?
It is used in 48 VDC control circuits where one relay coil must switch several independent circuits. Common uses include automation panels, machine control, process control, alarm circuits, auxiliary signaling, and relay interface applications.
Is Omron MY4 48VDC (S) a 4PDT relay?
Yes. It has a 4PDT contact arrangement, meaning four changeover contacts are operated at the same time by one 48 VDC coil.
Can it replace Omron MY4 48/50VAC (S)?
No. The 48VDC version is for DC coil circuits, while the 48/50VAC version is for AC coil circuits. They should not be interchanged unless the control circuit is redesigned.
Is this relay suitable for DC automation systems?
Yes, it is suitable when the system uses a 48 VDC control supply and the relay contact ratings match the connected loads. It is often used for auxiliary logic and signal switching.
What is the benefit of plug-in terminals?
Plug-in terminals allow the relay to be installed in a compatible socket. This makes replacement faster, reduces rewiring work, and supports cleaner cabinet layouts.
What should be considered when switching inductive DC loads?
Inductive DC loads can generate voltage spikes when the relay opens. Suitable suppression should be used to protect the contacts and reduce electrical noise.
What does the coil current tell engineers?
Coil current helps determine whether the control output can energize the relay safely. For example, PLC outputs and control modules must be rated to supply the required coil current.
Why is this relay used in industrial maintenance?
It is compact, service-friendly, and part of a well-known relay series. Maintenance teams can quickly identify and replace it when the correct socket and coil voltage are confirmed.