Omron MY4N-CR 110/120VAC (S) Miniature Power Relay Guide
The Omron MY4N-CR 110/120VAC (S) miniature power relay is a plug-in industrial relay designed for AC control circuits that require reliable switching, clear operation indication, and built-in coil surge suppression. It belongs to Omron’s MY relay family, a widely used relay series for control panels, machine automation, sequence control, HVAC panels, and industrial interface circuits.
This model is especially useful where 110 VAC or 120 VAC control voltage is used. Its 4PDT contact configuration allows one relay coil to switch four independent changeover circuits, making it practical for control logic, auxiliary signaling, interlocking, alarm circuits, and panel-based automation systems.
Technical Overview
Omron identifies the MY4N-CR AC110/120 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 listed as 110 VAC 50 Hz at 9.9 mA, 110 VAC 60 Hz at 8.4 mA, 120 VAC 50 Hz at 10.8 mA, and 120 VAC 60 Hz at 9.2 mA. The relay uses a 4PDT contact form, Au-clad silver alloy contact material, LED indicator, and plug-in terminal structure. Its rated contact load is listed as 220 VAC 3 A for resistive load and 24 VDC 3 A for resistive load. :contentReference[oaicite:0]{index=0}
The built-in CR surge absorber is an important feature. In AC coil applications, coil interruption can create electrical noise and transient voltage. A CR circuit helps reduce these effects, supporting cleaner panel operation and helping protect surrounding control components from unnecessary electrical stress.
Where It Is Commonly Used
The Omron MY4N-CR 110/120VAC (S) miniature power relay is commonly used in equipment that operates with 110 or 120 VAC control power. This includes industrial machines, control cabinets, pump systems, ventilation control, lighting control panels, compressor control, conveyor systems, and auxiliary control circuits.
Because it is a plug-in relay, it is well suited to maintenance-focused installations. Instead of rewiring the device during service, a technician can remove the relay from its compatible socket and install a matching replacement. This helps reduce downtime and keeps panel servicing more predictable.
Contact Function and Switching Use
The 4PDT design gives the relay four changeover contact sets. Each contact can switch between normally closed and normally open states when the coil is energized. This makes the relay useful when one control signal must operate multiple circuits at the same time.
For example, one contact may activate an indicator lamp, another may send feedback to a controller, another may switch an alarm circuit, and another may enable an auxiliary control path. This flexibility is one reason MY series relays remain common in automation panels and machine control environments.
Omron MY4N-CR 110/120VAC (S) Socket and Panel Installation
Omron lists compatible socket families for this relay style, including PYF14S, PYF14T, PYF-14-PU, PYFZ-14, PY14, PY14QN, and related 14-pin socket options. :contentReference[oaicite:1]{index=1} The correct socket should be chosen according to panel layout, wiring method, mounting style, service access, and applicable standards.
When installing the relay, the coil voltage must match the panel supply. Contact ratings must also be checked against the real load. Inductive loads such as contactor coils, solenoids, valves, and small motors may require derating or additional protection. For more details about Omron industrial components, visit Omron relay information.
FAQ
What is the Omron MY4N-CR 110/120VAC (S) used for?
It is used for industrial control circuits, sequence control, PLC interface panels, alarm systems, auxiliary switching, HVAC control, and machinery where 110 or 120 VAC control voltage is available.
What does CR mean in this relay code?
CR indicates a built-in capacitor-resistor surge absorption circuit. This circuit helps reduce coil-generated electrical transients when the AC coil is switched off.
Omron MY4N-CR 110/120VAC (S) What is the contact configuration of this relay?
The relay uses a 4PDT contact configuration. That means it has four independent changeover contacts operated by one coil.
Does this relay have an operation indicator?
Yes. Omron lists this model with an LED operation indicator, which helps maintenance teams visually confirm whether the relay coil is energized.
Can the Omron MY4N-CR 110/120VAC (S) switch DC loads?
Yes, it can switch DC loads within its rated limits. Omron lists 24 VDC 3 A for resistive load, but real suitability depends on the load type, current, voltage, and switching frequency.
Is it suitable for inductive loads?
It can be used with inductive loads when the load remains within the relay’s rated capacity. Omron lists lower ratings for inductive loads, so designers should verify the exact duty before installation.
Why choose a plug-in relay instead of a fixed relay?
A plug-in relay is easier to replace during maintenance. The wiring remains on the socket, and the relay body can be changed quickly when a matching replacement is available.
What should be checked before replacement?
Check coil voltage, frequency, contact form, socket type, contact rating, load type, surge suppression requirement, and whether the original panel requires an LED indicator or specific approval rating.