new Omron G4B-112T1-FD-US-RP 12VDC General Purpose Relay 25A 12VDC 4 Pins x1PC

Omron · Power Relay · G4B-112T1 · 25A SPDT

What Is the Omron G4B-112T1 Relay?

The Omron G4B-112T1-FD-US-RP is a general-purpose power relay with a 12VDC coil and 25A switching capacity in a compact 4-pin SPDT (Single Pole Double Throw) configuration. It provides robust power switching for motors, heaters, solenoids, and lighting loads in industrial control panels and automation systems. The Omron G4B series is known for high inrush current handling and long electrical life.

In short: An Omron 25A SPDT power relay with 12VDC coil — switches heavy industrial loads including motors and heaters from PLC or controller low-voltage outputs.

Key Features

1. 25A High Switching Capacity

What it means: Contacts rated for 25A resistive load — handles significant power without contact welding or excessive heating.
Why it matters: Many industrial loads (heaters, small motors, lighting banks) draw 10-25A — this relay switches them directly without an intermediate contactor.
Result: Single-component switching solution that reduces panel component count and wiring complexity.

2. SPDT (1 Form C) Contact Configuration

What it means: One common, one normally-open, and one normally-closed terminal — flexible for NO or NC applications.
Why it matters: A single relay can be wired for either energize-to-start or energize-to-stop logic — or to switch between two circuits.
Result: One relay type covers multiple control schemes, simplifying spare parts inventory.

3. 12VDC Coil

What it means: Coil operates at 12V DC — common in automotive, solar, and battery-backed control systems.
Why it matters: Interfaces directly with 12V control systems without a separate 24V power supply or voltage converter.
Result: Compatible with a wide range of DC-powered control architectures.

Key Specifications

Typical Applications

• Motor Start/Stop Control: Switching small single-phase motors up to approximately 1.5KW with a PLC digital output energizing the 12V relay coil.
• Heater Element Control: Cycling resistive heating elements in ovens, extruders, and environmental chambers via thermostat or PID controller outputs.
• Lighting Contactor: Switching banks of industrial and commercial lighting from timer or photocell control signals.
• Solenoid Valve Driver: Powering hydraulic and pneumatic solenoid valves that draw high inrush current beyond PLC output ratings.

Frequently Asked Questions

"What is the difference between the G4B and G2R Omron relay series?"

The G4B series handles higher current (25A) compared to the G2R series (typically 10-16A). The G4B has larger contacts and a more robust spring mechanism to handle the higher current and associated arc energy. Use G4B for power switching applications above 16A; use G2R for lower-power signal and small load switching.

"Do I need a flyback diode across the coil?"

Yes — always install a flyback (freewheeling) diode across the DC coil terminals (cathode to positive, anode to negative) to suppress the voltage spike when the coil is de-energized. Without the diode, the inductive kickback can damage the PLC output transistor or cause relay chatter from transient re-energization. The diode should be rated for at least the coil current (approximately 100-200mA for this relay type).

"What is the expected contact life at full load?"

Omron G4B relays typically specify 100,000+ electrical operations at rated load and 10,000,000+ mechanical operations. Actual contact life depends on load type — inductive loads (motors, solenoids) cause more arcing than resistive loads (heaters). For extended contact life at high inductive loads, consider adding an RC snubber across the contacts.

"Does KOEED carry other Omron relay models?"

Yes — we stock the full Omron relay range including solid-state relays (SSRs), signal relays, and power relays. Browse our Omron collection or send your specific part number to Moritta@KOEED.COM.

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