Omron G2R-2-SD 12VDC (S) Relay Socket Technical Article

The Omron G2R-2-SD 12VDC (S) Relay Socket is a DC plug-in relay designed for control panel applications where compact size, stable switching, and coil protection are important. The “SD” version is especially useful because it includes a built-in diode for coil surge suppression, helping protect sensitive control electronics from reverse voltage spikes.

Technical Characteristics

This model has a 12 VDC coil, with an approximate coil current of 43.2 mA and coil resistance around 278 ohms. It uses an 8-pin plug-in connection and a DPDT contact configuration. As a two-pole relay, it has a rated carry current of 5 A. The built-in diode makes it suitable for DC systems where suppression is preferred directly inside the relay body.

The mechanical indicator supports easier visual confirmation during panel inspection. This is valuable for technicians troubleshooting machine circuits, automation cabinets, and low-voltage control systems. Instead of checking every signal with a meter first, the indicator provides a quick operational reference.

Recommended Use Cases

The G2R-2-SD 12VDC relay is often used in PLC interface circuits, low-voltage control panels, alarm systems, automation modules, and DC-powered switching applications. It should be installed with correct polarity because of the built-in diode. For more Omron information, see Omron control panel components.

Omron G2R-2-SD 12VDC (S) FAQ

What does SD mean in this relay code?

SD indicates a version with a built-in diode for coil surge suppression.

Does polarity matter?

Yes. Because the relay includes a diode, correct DC polarity must be observed during wiring.

What is the contact form?

It has a DPDT contact form, allowing two circuits to be switched simultaneously.

Why is diode protection useful?

When a DC relay coil is de-energized, it can create a voltage spike. A built-in diode helps suppress that spike and protect connected electronics.