Omron MY4N-CR 220/240VAC (S) Miniature Power Relay Guide
The Omron MY4N-CR 220/240VAC (S) miniature power relay is a compact plug-in relay developed for industrial control circuits using 220 VAC or 240 VAC coil voltage. It is part of Omron’s MY relay range and is commonly applied in automation panels, control cabinets, machine systems, process equipment, and general-purpose industrial switching circuits.
This relay is designed for applications where a higher AC control voltage is used and where built-in coil surge absorption is preferred. Its 4PDT contact configuration allows one relay coil to operate four independent switching circuits, making it a flexible component for control logic and auxiliary circuit design.
Technical Overview
Omron lists the MY4N-CR AC220/240 as a miniature power relay with four poles, single contacts, plug-in terminals, built-in CR circuit for coil surge absorption, and an operation indicator. Its coil ratings are 220 VAC 50 Hz at 4.8 mA, 220 VAC 60 Hz at 4.2 mA, 240 VAC 50 Hz at 5.3 mA, and 240 VAC 60 Hz at 4.6 mA. The relay has a 4PDT contact form, Au-clad silver alloy contact material, LED indicator, plug-in terminal structure, and CR coil surge killer. :contentReference[oaicite:2]{index=2}
The listed contact rated load includes 220 VAC 3 A for resistive loads, 220 VAC 0.8 A for inductive loads, 24 VDC 3 A for resistive loads, and 24 VDC 1.5 A for inductive loads. :contentReference[oaicite:3]{index=3} These values show why load type matters. A relay that is suitable for a resistive heater or lamp circuit may need more careful evaluation when switching solenoids, contactor coils, or other inductive devices.
Omron MY4N-CR 220/240VAC (S) Why CR Surge Absorption Is Useful
In AC relay coils, switching the coil off can produce transient voltage and electrical noise. The built-in CR circuit helps absorb that surge and can contribute to cleaner control panel operation. This is particularly helpful in panels that include PLCs, timers, counters, temperature controllers, sensors, and other electronic devices.
The Omron MY4N-CR 220/240VAC (S) miniature power relay is therefore a practical choice when the design requires both AC coil compatibility and integrated suppression. It reduces the need for separate external suppression parts in many standard control applications, while keeping the relay footprint compact.
Typical Industrial Applications
This relay is often used in machine control, conveyor systems, pump panels, compressor circuits, HVAC controls, industrial lighting control, packaging machinery, auxiliary contact multiplication, and control panel interlocking. Its four changeover contacts allow designers to manage several signals from one coil command.
For example, one relay can switch a status signal, activate an alarm lamp, provide feedback to a controller, and enable a secondary control path. This makes the relay highly useful in conventional relay logic systems and mixed PLC-relay panels.
Installation Notes
The MY4N-CR AC220/240 relay uses socket mounting and supports multiple Omron socket options, including PYF14S, PYF14T, PYF-14-PU, PYFZ-14, PY14, PY14QN, and related 14-pin models. :contentReference[oaicite:4]{index=4} Socket selection should be based on DIN rail mounting, panel depth, wiring access, terminal preference, and maintenance requirements.
Before installation, confirm the exact coil supply voltage, frequency, contact load, wiring diagram, and environmental conditions. For additional Omron component references, visit Omron automation products.
FAQ
What is the Omron MY4N-CR 220/240VAC (S) relay used for?
It is used in industrial control circuits where 220 or 240 VAC coil voltage is available. Common uses include relay logic, auxiliary switching, machine control, alarms, indicators, and interface circuits.
What does the CR function do?
The CR function is a capacitor-resistor surge absorption circuit. It helps reduce transient voltage generated by the relay coil when the coil is switched off.
Does this relay have an LED indicator?
Yes. Omron lists the model with an LED operation indicator, which makes it easier to check coil energization during inspection or troubleshooting.
Omron MY4N-CR 220/240VAC (S) What contact form does it use?
It uses a 4PDT contact form, meaning four independent changeover contacts are operated by a single coil.
Can it switch 24 VDC loads?
Yes, Omron lists 24 VDC contact ratings for this relay. The allowable current depends on whether the load is resistive or inductive.
Is this relay suitable for contactor coil control?
It may be suitable if the contactor coil load remains within the relay’s inductive load rating. Designers should always compare the contactor coil current and inrush behavior with the relay specification.
Why is the 220/240 VAC coil version selected?
It is selected when the control circuit operates at 220 or 240 VAC. Using the correct coil voltage is essential for proper relay operation and long-term reliability.
Can this relay be replaced without rewiring?
In a socket-based installation, the relay body can usually be removed and replaced without rewiring the socket. The replacement must match the coil voltage, contact form, suppression type, and terminal arrangement.