Omron MY4ZN-CR 110/120VAC (S) Miniature Power Relay Guide
The Omron MY4ZN-CR 110/120VAC (S) miniature power relay is a socket-mounted electromechanical relay designed for AC control circuits. It offers a 4PDT bifurcated contact arrangement, plug-in installation, LED and mechanical indication, and a built-in RC circuit for coil surge suppression. These features make it useful in control cabinets, machine panels, HVAC systems, and industrial automation circuits that use 110/120 VAC control power.
Omron MY4ZN-CR 110/120VAC Technical Overview
This relay uses a 110/120 VAC coil and is built for general-purpose switching. The 4PDT contact structure allows four changeover circuits to operate together, which is helpful when several auxiliary signals must be switched from a single control command. Its bifurcated contacts support reliable performance in low-current control paths, while the plug-in format improves serviceability.
The CR designation refers to the built-in RC circuit. In AC relay circuits, switching the coil can create electrical noise or transient voltage behavior. The RC network helps reduce these effects, supporting cleaner switching and improving compatibility with control equipment.
Why Choose an AC Coil Relay?
Many legacy panels, building systems, process machines, and industrial control circuits continue to use 110/120 VAC control voltage. The Omron MY4ZN-CR 110/120VAC (S) is suitable for these environments because it aligns with common AC control architectures while still offering modern diagnostic features such as LED operation indication and a transparent case.
Typical Applications
This model may be used in relay logic panels, machine control circuits, pump controls, HVAC equipment, alarm circuits, signal multiplication, and auxiliary contact expansion. It is also suitable for maintenance projects where an existing AC control relay must be replaced with a compatible Omron MY-series plug-in relay, provided all electrical and mechanical requirements are confirmed.
Omron MY4ZN-CR 110/120VAC (S) Practical Installation Notes
Because the relay is socket-mounted, correct socket selection is essential. The installer should confirm the pin layout, terminal arrangement, coil voltage, contact ratings, and enclosure conditions. AC coils should be connected according to the panel design, and load switching should stay within the relay’s rated limits. The relay should not be selected based only on coil voltage; contact duty and load type are equally important.
For more Omron relay references and related automation components, visit Omron product information.
FAQ
What is the Omron MY4ZN-CR 110/120VAC (S) miniature power relay?
It is a plug-in relay with a 110/120 VAC coil, 4PDT bifurcated contacts, mechanical and LED indication, and a built-in RC circuit for coil surge suppression.
What does CR mean in this relay model?
CR indicates that the relay includes an RC circuit. This circuit helps suppress coil-related transients in AC applications.
Omron MY4ZN-CR 110/120VAC (S) Is this relay suitable for low-current signal switching?
Yes. Its bifurcated contact design can help improve reliability in lower-current control and signal circuits, assuming the application remains within the relay’s specified ratings.
Can it replace any 110/120 VAC relay?
No. Replacement should be based on coil voltage, contact form, contact rating, socket compatibility, terminal layout, load type, and panel requirements.
Why is LED indication useful?
LED indication helps technicians quickly identify whether the coil is energized. This can reduce troubleshooting time during commissioning and maintenance.