Omron MY4IN-CR-GS-R AC110/120 Plug-In Relay: Technical Overview and Practical Use
The Omron MY4IN-CR-GS-R AC110/120 plug-in relay is a 14-pin general-purpose electromechanical relay designed for control panels, machinery circuits, automation systems, and industrial switching applications. It belongs to Omron’s MY-GS relay family, a widely used miniature power relay series known for clear visual status checking, practical socket mounting, and dependable multi-contact switching.
This model is built around a 4PDT contact configuration, meaning it can control four separate changeover circuits from a single coil input. That makes it useful when one control signal must switch several auxiliary circuits at the same time. According to Omron’s product data, this relay is a plug-in, 14-pin, 4PDT relay with a rated carry current of 6 A, mechanical and LED indicators, a lockable push test button, and integrated coil surge absorption through a CR circuit. :contentReference[oaicite:0]{index=0}
Core Technical Characteristics
The coil rating of the MY4IN-CR-GS-R AC110/120 is intended for 110/120 VAC control circuits. In panel environments where alternating-current control voltage is used, this coil range allows the relay to interface with established industrial control architectures. The relay uses silver contact material and a 4PDT contact arrangement, supporting reliable switching for control loads, signaling circuits, interlocks, and auxiliary logic functions.
The CR surge absorption feature is one of the defining points of this version. In AC relay coils, switching transients may occur when the coil is de-energized. A CR circuit helps suppress these voltage spikes, supporting improved electrical noise behavior and protecting surrounding control electronics from unnecessary stress. This is especially relevant in cabinets that include PLC outputs, timers, counters, sensors, and other low-voltage control components.
Indicators, Test Button, and Maintenance Benefits
The relay includes both mechanical and LED indicators. The mechanical indicator provides a direct visual reference of contact operation, while the LED indicator confirms coil energization. Omron’s MY family documentation also notes that AC coil relays use a red LED, while DC coil relays use a green LED, helping technicians identify coil type quickly during service work. :contentReference[oaicite:1]{index=1}
The lockable push test button is valuable during commissioning and troubleshooting. It allows controlled manual operation during circuit checks, helping engineers verify wiring logic before a system enters full operation. In maintenance workflows, this can reduce diagnostic time because technicians can observe load response, indicator behavior, and contact function without immediately modifying wiring.
Where This Relay Is Commonly Used
The Omron MY4IN-CR-GS-R AC110/120 plug-in relay is suitable for industrial control panels, machine automation, HVAC control circuits, auxiliary switching, motor control logic, alarm circuits, and interface applications. Its plug-in construction makes replacement easier than hard-wired relay formats, particularly when used with compatible Omron PYF sockets.
Because it combines 4PDT switching, 110/120 VAC coil operation, CR surge absorption, and clear operating indication, this relay is often selected where reliability, service visibility, and organized panel maintenance are important. For related Omron relay components and compatible automation parts, see more Omron information.
Frequently Asked Questions
What is the Omron MY4IN-CR-GS-R AC110/120 plug-in relay used for?
It is used to switch multiple control circuits from a single 110/120 VAC coil input. Typical applications include control panels, automation machinery, auxiliary relay logic, signaling circuits, and electrical interlocking systems.
Omron MY4IN-CR-GS-R AC110/120 What does 4PDT mean on this relay?
4PDT means four-pole double-throw. The relay has four independent changeover contacts, allowing one coil signal to switch four separate circuits between normally open and normally closed states.
Why is the CR circuit important?
The CR circuit provides coil surge absorption. It helps reduce switching transients generated when the AC coil is de-energized, which can improve electrical noise performance inside control cabinets.
Omron MY4IN-CR-GS-R AC110/120 Does this relay have visual indication?
Yes. It includes mechanical and LED indicators. The mechanical indicator shows contact operation, while the LED indicates coil energization, making inspection and troubleshooting easier.
Is it suitable for socket mounting?
Yes. It is a plug-in relay intended for use with compatible 14-pin relay sockets. Socket mounting supports easier replacement, cleaner panel wiring, and more efficient maintenance.