Omron MY4 24VDC (S) General Purpose Relay for Automation Panels
The Omron MY4 24VDC (S) general purpose relay is a compact plug-in electromechanical relay designed for industrial automation, machine control, PLC interface circuits, auxiliary switching, and panel-based control systems. As part of the Omron MY miniature power relay series, it provides a practical balance of compact size, reliable switching, and service-friendly socket installation.
This relay uses a 24 VDC coil, making it especially relevant for modern control panels where 24 VDC power supplies are standard. Many PLC outputs, sensor circuits, safety interfaces, and control modules operate around 24 VDC architecture, so this version is often selected when relay isolation or multi-contact switching is required.
Technical Overview
The Omron MY4 24VDC (S) relay is a 4-pole plug-in relay with a 4PDT contact arrangement. The contact material is specified as gold-clad silver alloy, and the relay is built for socket installation. Published Omron specifications list the MY4 DC24 as a miniature power relay with a 24 VDC coil, 36.3 mA coil current, 662 ohm coil resistance, 4PDT contact form, plug-in terminals, and rated loads including 3 A at 220 VAC resistive load, 0.8 A at 220 VAC inductive load, 3 A at 24 VDC resistive load, and 1.5 A at 24 VDC inductive load.
Why 24 VDC Matters in Control Systems
In industrial automation, 24 VDC is one of the most common control voltages. It is widely used because it supports safer control wiring, easy integration with PLCs, compatibility with sensors, and stable operation in distributed control cabinets. The Omron MY4 24VDC (S) general purpose relay fits naturally into these systems by allowing a low-power DC signal to switch multiple isolated circuits.
The 4PDT contact structure is especially helpful when several operations must occur together. One contact may send a signal to a PLC input, another may energize an alarm circuit, another may switch an auxiliary lamp, and another may control a separate relay or interlock. This makes the relay a useful component in structured control logic.
Key Features
- Brand and model: Omron MY4 24VDC (S)
- Product type: General purpose electromechanical relay
- Coil voltage: 24 VDC
- Coil current: 36.3 mA
- Coil resistance: 662 ohms
- Contact form: 4PDT
- Terminal structure: Plug-in terminal
- Contact material: Gold-clad silver alloy
Practical Selection Notes
The Omron MY4 24VDC (S) should be selected when the control circuit provides 24 VDC and the application requires four changeover contacts. It is important not to confuse this model with 24 VAC or higher-voltage versions. Even if the physical relay body appears similar, the coil design is different.
For inductive loads, the relay should be applied with care. Solenoids, contactors, and electromagnetic actuators can generate voltage spikes when switched off. Proper suppression, such as flyback protection in DC circuits or suitable surge control methods, helps reduce contact wear and improves long-term reliability.
For more Omron relay products and compatible industrial automation components, visit Omron control components.
FAQ
What is the Omron MY4 24VDC (S) used for?
It is used for switching multiple circuits in 24 VDC control systems. Common applications include PLC interface circuits, machine control panels, alarm systems, auxiliary logic, motor control panels, and automation equipment.
Is Omron MY4 24VDC (S) suitable for PLC outputs?
Yes, it can be suitable when the PLC output rating can drive the relay coil and the circuit design allows relay-based isolation. Always check the output current capacity before connecting the relay coil.
What does 4PDT mean?
4PDT means four-pole double-throw. The relay has four independent changeover contacts that move together when the coil is energized.
Can this relay switch AC and DC loads?
Yes, the contacts can switch both AC and DC loads within the specified ratings. The coil is 24 VDC, but the contacts are separate from the coil and can be used with suitable AC or DC circuits.
Why are gold-clad silver alloy contacts useful?
Gold-clad silver alloy contacts can support reliable contact performance in control and signal applications. The material combination helps balance conductivity and switching durability for suitable loads.
Can it replace Omron MY4 24VAC (S)?
No. The 24VDC version should not be used as a direct replacement for a 24VAC relay. The coil voltage and current type must match the control circuit.
What should maintenance teams verify before replacement?
They should verify coil voltage, socket type, wiring diagram, contact arrangement, load current, load voltage, relay marking, and any panel documentation. Matching only the shape of the relay is not enough.
Is the relay good for compact panels?
Yes. Its plug-in design and four-contact layout allow multiple switching functions in a compact relay footprint, which can help save cabinet space.