Omron G9SB-200-B Safety Relay Unit

Technical Overview

The Omron G9SB-200-B is a slim-profile, dual-channel safety relay unit designed for emergency stop circuits and other safety applications. It operates on a versatile 24V AC/DC supply and provides two normally open (NO) safety outputs. Housed in a compact 17.5mm wide body for DIN rail mounting, it is ideal for saving space in control panels. This unit is certified for high safety standards, including PLe according to EN ISO 13849-1, ensuring reliable disconnection of power in critical situations.

Key Features

Ultra-slim 17.5mm width for high-density panel mounting.
Supports both 1-channel or 2-channel inputs for flexible application.
Auto-reset functionality.
Compliant with EN ISO 13849-1 PLe / Category 4 safety standards.
Universal 24V AC/DC power supply compatibility.
Screw terminal connections for secure wiring.
Designed for DIN rail mounting.

Technical Specification Matrix

Parameter	Value
Supply Voltage	24V AC/DC
Power Consumption	2.9 VA/1.4 W max
Safety Outputs	2x NO (DPST-NO)
Safety Category	PLe / Category 4 (EN ISO 13849-1)
Response Time	10 ms max
Operating Temperature	-25 to 55°C
Degree of Protection	IP20
Mounting	DIN Rail
Terminal Type	Screw Terminals
Dielectric Strength	2,500 VAC for 1 min (between inputs and outputs)
Vibration Resistance	10 to 55 Hz, 0.375-mm single amplitude

Industrial Applications

1. Emergency Stop Circuit Monitoring

Used to monitor a dual-channel emergency stop button on a CNC machine. The G9SB-200-B's two safety inputs continuously check the integrity of the E-stop switch wiring. When the button is pressed, the relay's fast 10ms response time ensures the immediate and safe removal of power to the machine's motors.

Problem Solved

Provides a certifiable safety function (PLe/Category 4) to reliably interrupt machine operation in an emergency, protecting operators from injury.

Emergency StopPLe Category 4Dual-Channel Input24VDC ControlFast Response Time

2. Safety Gate Interlock for Robotic Cells

Integrated into the control system of a robotic welding cell. A non-contact door switch is wired to the dual-channel inputs of the G9SB-200-B. If the access gate is opened during operation, the relay's safety outputs will open, de-energizing the robot's servo drives and the welding power source.

Problem Solved

Ensures that hazardous robotic motion is stopped before a worker can enter the operating envelope, preventing crushing or impact injuries. The slim 17.5mm width saves valuable DIN rail space in crowded control cabinets.

Gate InterlockSafety RelayRobotic Cell24V AC/DCDIN Rail Mount

3. Light Curtain Muting Control for Packaging Lines

Serves as the safety interface for a light curtain guarding the infeed of a palletizing machine. The light curtain's OSSD (Output Signal Switching Device) outputs are connected to the G9SB-200-B. If an operator's hand breaks the light curtain's beam, the relay immediately stops the conveyor and palletizer.

Problem Solved

Provides a simple and reliable safety circuit to protect personnel from moving machinery as they interact with the packaging line, leveraging its certified safety rating and straightforward 24V AC/DC power requirement, which is standard in such equipment.

Light CurtainOSSD InterfacePackaging MachineSafety CircuitIP20