Omron G9SB-3012-A AC/DC24 Safety Relay

Technical Overview

The Omron G9SB-3012-A AC/DC24 is an ultra-slim, high-reliability safety relay unit designed for machine control and safety application circuits. Measuring just 22.5 mm in width, it maximizes space inside control panels. It features a dual-channel inverse input configuration and automatic reset capabilities. It comes equipped with three safety contacts (3PST-NO) and one auxiliary feedback contact (SPST-NC). Operating on a universal 24 VAC/VDC power supply, this safety relay conforms to strict EN standards including safety Category 4 and PL e under EN ISO 13849-1 depending on the circuit configuration.

Key Features

Slim-sized 22.5 mm width housing saves space in control panels [1.1.6]
Provides 3 safety contacts (3PST-NO) and 1 auxiliary contact (SPST-NC)
Supports dual-channel inverse inputs for high-reliability monitoring
Equipped with automatic reset mode for hands-free system recovery
Conforms to EN ISO 13849-1 (up to PLe/Category 4) and TÜV approved
DIN rail mounting possible for easy installation
Handles up to 5 A carry current at 250 VAC / 30 VDC

Technical Specification Matrix

Parameter	Value
Supply Voltage	24 VAC (50/60 Hz) or 24 VDC [1.1.6]
Operating Voltage Range	85% to 110% of rated power supply voltage
Power Consumption	1.7 VA / 1.7 W max.
Input Current	30 mA max.
Safety Output Contact	3PST-NO
Auxiliary Output Contact	SPST-NC
Rated Load (Resistive)	250 VAC, 5 A / 30 VDC, 5 A
Rated Carry Current	5 A
Reset Mode	Auto-reset
Input Type	Inverse
Number of Input Channels	2 channels
Operating Time	30 ms max.
Response Time	10 ms max.
Insulation Resistance	100 MΩ min. (at 500 VDC)
Dielectric Strength	2,500 VAC, 50/60 Hz for 1 min (between inputs and outputs)
Vibration Resistance	10 to 55 to 10 Hz, 0.375-mm single amplitude (0.75-mm double amplitude)
Shock Resistance (Destruction)	300 m/s²
Shock Resistance (Malfunction)	100 m/s²
Mechanical Durability	5,000,000 operations min. (at approx. 7,200 operations/hr)
Electrical Durability	100,000 operations min. (at approx. 1,800 operations/hr)
Ambient Operating Temperature	-25 to 55°C (with no icing or condensation)
Ambient Operating Humidity	35% to 85%
Protection Class	IP20
Terminal Tightening Torque	0.5 N·m

Industrial Applications

1. Emergency Stop Monitoring in Packaging Lines

Monitors active emergency stop pushbuttons along automated packaging machinery. If an operator triggers the E-stop, the safety relay immediately interrupts the power supply to the hazard zones within its fast 10 ms response time.

Problem Solved

Enables compliance with Safety Category 4 and PL e standards, preventing serious worker injury by instantly and reliably stopping high-inertia mechanical parts.

Emergency StopCategory 4PL eResponse Time3PST-NO Output

2. Guard Door interlocking verification

Interfaces with two physical limit switches on protective safety gates. The relay processes dual-channel inverse inputs to ensure the guard is completely closed before the conveyor or system is allowed to restart.

Problem Solved

Prevents unauthorized or dangerous start-ups in case one of the switches welds shut or fails (resolving single-fault conditions) while alerting the main controller via the auxiliary contact.

Guard InterlockingDual-ChannelInverse InputSPST-NC Auxiliary ContactAuto-reset

3. Optoelectronic Safety Sensor Integration

Acts as the safety monitoring interface for light curtains and optoelectronic sensors guarding hazardous robotic welding zones. It translates the sensor output state to control heavy-duty contactors.

Problem Solved

Provides high-speed signal translation within a highly compact 22.5 mm DIN footprint, making it ideal for congested electrical panels that require robust IP20 finger-safe terminal wiring.

Light CurtainDIN-Rail MountingLow Power ConsumptionIP20 ProtectionScrew Terminals