Omron LY2I4N 24VAC General Purpose Relay Technical Guide

The Omron LY2I4N 24VAC general purpose relay is a socket-mounted electromechanical relay designed for 24 VAC control circuits. It is part of the Omron LY series and combines DPDT switching, 10 A contact capability, an LED indicator, and a test button. These features make it useful in automation panels, HVAC controls, building systems, and industrial equipment where low-voltage AC control is preferred.

Technical Overview

This relay uses a 24 VAC coil and a DPDT contact configuration, also known as 2 Form C. It can switch two separate circuits from one coil signal. Technical listings describe the relay as socketable, non-latching, and rated for 10 A contact current. Common maximum switching values include 250 VAC and 125 VDC, depending on the application and load conditions.

The coil current is listed at about 46 mA, with coil resistance around 180 ohms. The must-operate voltage is commonly specified at 19.2 VAC, while the release voltage is around 7.2 VAC. Typical operate and release times are approximately 25 ms. The operating temperature range is generally listed from -25°C to 55°C, making the relay suitable for many indoor control cabinet environments.

Practical Advantages

The LED indicator helps confirm coil status visually, which is valuable during commissioning and troubleshooting. The test button allows controlled manual actuation, helping technicians verify wiring, downstream devices, and contact behavior. Because the relay is plug-in and socket-mounted, it supports straightforward replacement and organized panel design.

Where It Is Commonly Used

The Omron LY2I4N 24VAC relay is often used in HVAC systems, burner controls, control transformers, building automation panels, pump logic, alarm interfaces, and machine auxiliary circuits. A 24 VAC coil is common in systems where control transformers provide isolated low-voltage AC power. The DPDT contact form gives designers flexibility when two related circuits must be switched together.

Selection and Safety Notes

Before using this relay, confirm the coil voltage, socket compatibility, load type, current rating, and required approvals. Inductive loads such as solenoids and contactor coils can create voltage spikes, so suppression methods may be needed. The relay should be installed in accordance with the equipment wiring diagram and standard electrical safety practices.

For more information about Omron, explore related relay families, socket accessories, and automation components.

Omron LY2I4N 24VAC FAQ

What is the Omron LY2I4N 24VAC general purpose relay used for?

It is used for switching control and auxiliary circuits in systems that use 24 VAC control power, including HVAC, building automation, and machine panels.

What does the LED indicator show?

The LED indicator shows when the relay coil is energized, helping technicians confirm the control signal quickly.

What is the benefit of the test button?

The test button allows manual relay operation during commissioning or troubleshooting, making it easier to confirm contact function and wiring behavior.

Is this relay socket-mounted?

Yes. The Omron LY2I4N 24VAC is a plug-in, socketable relay, which supports clean panel wiring and easy replacement.

Can it switch both AC and DC loads?

Yes, within its specified voltage and current ratings. The actual load type, inrush current, and switching frequency should always be reviewed before use.