Omron MY4IN1-D2 24VDC (S) Miniature Power Relay Explained
The Omron MY4IN1-D2 24VDC (S) miniature power relay is a compact plug-in relay designed for industrial control systems that use 24 VDC control voltage. It is widely suited to automation panels, PLC output circuits, machine control systems, and auxiliary switching functions where several circuits need to be switched from one coil signal.
According to Omron’s technical listing, this relay uses a 24 VDC coil, has a coil current of approximately 37.7 mA, and a coil resistance of approximately 636 ohms. It includes LED operation indication, a diode coil surge killer, plug-in terminals, and a 4PDT contact form. The contact material is Au clad plus Ag alloy, supporting dependable low-level and control-circuit switching.
Core Technical Features
The 4PDT contact form is one of the most important characteristics of this relay. It provides four changeover contact sets in a single device. For engineers and panel builders, this means one relay can control multiple signal paths while preserving electrical separation between circuits.
The built-in diode is another major design feature. When a DC relay coil is turned off, stored magnetic energy can create a voltage spike. The integrated diode helps absorb this coil surge, making the relay more suitable for transistor outputs, PLC modules, and other electronic control devices.
Omron MY4IN1-D2 24VDC (S) Why 24 VDC Matters
24 VDC is one of the most common control voltages in modern automation. It is used in PLC systems, sensors, control relays, safety interfaces, and distributed I/O panels. The Omron MY4IN1-D2 24VDC (S) miniature power relay fits naturally into these environments because it can be driven directly from many industrial control outputs, provided the output rating matches the coil demand.
The relay’s plug-in construction also supports maintenance efficiency. If a relay reaches the end of its service life or must be replaced during troubleshooting, the component can be removed from its socket without disturbing the wiring layout.
Typical Applications
This relay is suitable for control signal multiplication, alarm output switching, interlock circuits, machine status indication, panel logic, auxiliary switching, and interface circuits between PLCs and field devices. Its mechanical and LED indicators help technicians understand relay state during live diagnostics.
In machine building, the relay can be used where one 24 VDC control signal must control several separate electrical paths. In process panels, it may be used to isolate control signals from different subsystems. In maintenance environments, its test button can support functional checks when used according to proper safety procedures.
For more technical product browsing, visit Omron relay information.
Frequently Asked Questions
What is the Omron MY4IN1-D2 24VDC (S) miniature power relay?
It is a 24 VDC plug-in industrial relay with a 4PDT contact form, LED indication, mechanical indication, test function, and built-in diode surge absorption.
What is the coil current of this relay?
The coil current is approximately 37.7 mA for the 24 VDC model, based on Omron technical data.
What is the coil resistance?
The coil resistance is approximately 636 ohms at standard reference conditions.
Why is a diode included?
The diode helps suppress coil surge voltage when the relay is de-energized. This is useful for protecting electronic outputs and improving circuit behavior.
Can this relay be used with PLC outputs?
Yes, it is commonly used with PLC outputs, provided the PLC output can supply the required coil current and the wiring polarity is correct.
What does the LED indicator show?
The LED indicates coil energization, helping technicians confirm relay operation during commissioning or fault finding.
Is the Omron MY4IN1-D2 24VDC (S) suitable for AC control voltage?
No. This specific model is for 24 VDC coil circuits. AC applications require a relay with an AC-rated coil.