Omron MY3 110/120VAC General Purpose Relay
The Omron MY3 110/120VAC general purpose relay is a miniature plug-in power relay designed for control panel switching, auxiliary automation circuits, and industrial machine interfaces. It uses a 110/120 VAC coil and a 3PDT contact form, allowing three separate changeover circuits to be operated from one coil signal.
According to Omron product data, this model features plug-in terminals, silver contacts, a transparent case, a mechanical indicator, and a 5 A rated carry current. It is commonly used with compatible 11-pin socket mounting, including PYF11A-type socket arrangements. These characteristics make the relay practical for serviceable control cabinets where easy replacement and visual status checking are important.
Omron MY3 110/120VAC Technical Overview
The relay has a 3PDT contact configuration, meaning it includes three independent double-throw contact sets. This makes it suitable for switching multiple control signals at the same time, such as interlocks, pilot signals, alarms, and auxiliary command paths. The contact rated load includes 220 VAC at 5 A for resistive loads and 24 VDC at 5 A for resistive DC loads, while inductive load ratings are lower and must be considered during circuit design.
The coil is intended for 110/120 VAC control circuits. Omron lists coil current values for both 50 Hz and 60 Hz operation, which is important in global installations where supply frequency may vary. The operate voltage is specified as 80 percent maximum of rated voltage, helping engineers understand the minimum energizing threshold under normal conditions.
Application Areas
The Omron MY3 110/120VAC general purpose relay is often selected for industrial control panels, machine automation, conveyor controls, HVAC control circuits, pump panels, and signal isolation. Its plug-in structure reduces downtime because the relay can be replaced without disturbing the socket wiring.
For maintenance teams, the transparent housing and mechanical indicator are especially useful. The case allows the internal mechanism to be observed, while the indicator provides a quick visual reference when checking whether the coil has energized. This can shorten troubleshooting time during commissioning or service work.
Installation Considerations
Before installation, the control supply must be confirmed as 110/120 VAC. This relay should not be substituted for DC coil versions or different voltage models unless the full circuit specification supports the change. Contact loading should also be checked carefully, especially when switching inductive devices such as solenoids, contactor coils, or small motors.
For related Omron relay information, visit Omron product resources.
FAQ
What is the Omron MY3 110/120VAC relay used for?
It is used for general-purpose control switching in electrical panels, automation equipment, machine controls, and auxiliary circuits where a 110/120 VAC coil supply is available.
Omron MY3 110 What does 3PDT mean?
3PDT means three-pole double-throw. The relay can switch three independent changeover circuits at the same time when the coil is energized.
Is this relay socket mounted?
Yes. The relay uses plug-in terminals and is designed for socket mounting, which supports easier replacement and cleaner panel wiring.
Can the Omron MY3 110/120VAC switch DC loads?
Yes, within its rated limits. Omron lists 24 VDC 5 A for resistive loads, while inductive DC loads require lower current ratings and proper protection.
Why is the mechanical indicator useful?
The mechanical indicator helps technicians see whether the relay has operated, which is helpful during troubleshooting, commissioning, and preventive maintenance.
Can this model replace a 12 VDC relay?
No. The coil voltage and current type must match the control circuit. A 110/120 VAC relay is not a direct replacement for a 12 VDC relay.