Omron MY3 100/110VAC General Purpose Relay

The Omron MY3 100/110VAC general purpose relay is a compact plug-in electromechanical relay designed for control panels, automation systems, machine interfaces, and auxiliary switching circuits. It belongs to the Omron MY miniature power relay family and is widely used where dependable multi-circuit switching is required in a structured electrical control environment.

This model uses a 100/110 VAC coil and provides a 3PDT contact configuration, allowing three independent changeover contacts to be controlled by a single coil signal. For engineers, technicians, and panel builders, that means one relay can manage several related control paths while keeping the circuit layout organized and serviceable.

Key Technical Characteristics

The Omron MY3 100/110VAC relay is built with a plug-in terminal structure and is intended for use with a compatible 11-pin socket, including the PYF11A socket. Its rated carry current is 5 A, and the contact material is silver, which supports reliable switching in general-purpose industrial applications. The relay also features a transparent case and a mechanical indicator, making visual inspection easier during maintenance or troubleshooting.

The 3PDT contact arrangement is one of the most important features of this relay. It allows the device to switch three separate circuits at the same time, which is useful in applications such as signal routing, interlock circuits, control logic separation, alarm systems, and auxiliary command functions. Because the relay is plug-in type, replacement can be performed without rewiring the entire circuit, provided the socket and wiring remain in good condition.

Where This Relay Is Commonly Used

The Omron MY3 100/110VAC general purpose relay is suitable for control cabinets where 100 or 110 VAC control voltage is available. It is often selected for industrial automation panels, machine control circuits, HVAC control systems, pump panels, conveyor systems, and signal isolation tasks. Its compact body makes it convenient for dense panel layouts, while the mechanical indicator gives maintenance teams a quick way to confirm relay operation.

In practical use, this relay can help separate low-power control signals from field devices. For example, a PLC output or control switch may energize the coil, while the relay contacts handle separate control lines. This approach improves circuit flexibility and can simplify fault isolation during service work.

Selection and Installation Notes

Before using the Omron MY3 100/110VAC relay, the coil voltage must be checked against the actual control supply. A relay with a 100/110 VAC coil should not be treated as interchangeable with DC coil versions or higher AC voltage versions. The contact load should also be reviewed carefully. The 5 A rating is a carry current reference, but real switching performance depends on load type, voltage, inrush current, and whether the load is resistive or inductive.

For socket mounting, the PYF11A socket is commonly associated with this model. Socket-based installation supports cleaner wiring, faster replacement, and easier panel maintenance. More information about Omron relay solutions can help when comparing compatible models and accessories.

FAQ

What is the Omron MY3 100/110VAC relay used for?

It is used for general-purpose switching in control panels, automation circuits, machine interfaces, signal isolation systems, and auxiliary control applications. Its 3PDT contact form allows one coil signal to control three changeover contacts.

Is the Omron MY3 100/110VAC a plug-in relay?

Yes. It has plug-in terminals and is designed to be mounted on a compatible 11-pin relay socket. This makes replacement easier because the relay can be removed from the socket without disturbing the field wiring.

What does 3PDT mean on this relay?

3PDT means three-pole double-throw. In simple terms, the relay has three separate changeover contact sets. Each set can switch between normally closed and normally open paths when the coil is energized.

Can this relay be used with DC control voltage?

No. This specific model is designed for 100/110 VAC coil operation. For DC control circuits, a DC coil version such as a 12 VDC or 24 VDC model should be selected according to the circuit requirement.

Why is the mechanical indicator useful?

The mechanical indicator provides a visual confirmation that the relay has operated. This is useful during commissioning, troubleshooting, and routine maintenance because it helps technicians identify relay status without immediately using test equipment.

Which socket is commonly used with this relay?

The relay is associated with 11-pin socket mounting, and the PYF11A socket is commonly listed as a compatible option. Socket selection should always be verified against the panel design and installation standard.

Is this relay suitable for industrial panels?

Yes. Its plug-in design, 3PDT contact structure, transparent case, and 5 A rated carry current make it suitable for many industrial control panel applications where compact and serviceable relay switching is needed.