Omron LY4-0 48VDC General Purpose Relay Technical Guide
The Omron LY4-0 48VDC general purpose relay is a four-pole electromechanical relay designed for control systems that use 48 VDC coil voltage. It is part of the Omron LY relay family, which is widely applied in automation panels, machine control circuits, equipment monitoring, and industrial switching applications.
This relay features a 4PDT contact arrangement, allowing four independent changeover circuits to be switched from one coil. That makes it useful in systems where one control signal must operate several circuits at the same time. Typical examples include auxiliary control, alarm routing, signal isolation, interlock circuits, and multi-output relay logic.
Technical Characteristics
Omron lists the LY4 48VDC relay with a 48 VDC coil, four poles, 10 A rated carry current, AgSnIn contact material, transparent case, and 4PDT contact description. The terminal type is listed as plug-in and solder, which makes terminal verification especially important when replacing or specifying this part.
The silver tin indium contact material helps support reliable switching in general-purpose relay applications. The transparent case is also useful in control panels because it allows visual inspection of the relay structure and identification without unnecessary handling.
Where the Relay Is Commonly Used
The Omron LY4-0 48VDC general purpose relay is suitable for 48 VDC control systems, automation cabinets, industrial equipment, monitoring circuits, machine control interfaces, telecom-related control hardware, and panel-based relay logic. The 48 VDC coil voltage can be especially relevant in systems where 24 VDC is not the primary control standard.
Because this relay provides multiple changeover contacts, it can simplify designs that would otherwise require several separate relays. However, every contact set must still be evaluated for current, voltage, load category, and switching frequency. The total design must remain within the manufacturer’s rated limits.
Selection and Safety Notes
Before selecting this relay, confirm the complete stock code, terminal type, socket compatibility, coil voltage, contact rating, operating temperature, and electrical load characteristics. A relay that appears physically similar may have a different coil voltage or terminal arrangement, which can cause failure if installed incorrectly.
Inductive DC loads require special attention. Coils, solenoids, and motors can create high voltage transients when switched off. Using appropriate suppression can reduce contact wear, electrical noise, and unexpected control circuit disturbances.
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Omron LY4-0 48VDC FAQ
What is the Omron LY4-0 48VDC relay?
It is a general purpose electromechanical relay with a 48 VDC coil and 4PDT contact configuration.
What does 4PDT allow this relay to do?
It allows the relay to switch four separate changeover circuits at the same time using one coil input.
What is the rated carry current?
Omron lists the rated carry current as 10 A. Actual switching suitability depends on load type, voltage, and operating conditions.
What contact material is used?
Omron Europe lists AgSnIn contact material for the LY4 48VDC model.
Can this relay replace any LY4 relay?
No. The coil voltage, terminal type, contact rating, and socket compatibility must match the existing application before replacement.