Omron G7SA-2A2B DC24 — Safety Device
SKU: G7SA-2A2B DC24USD 6.00
Slim 4-pole forcibly-guided safety relay, 2 NO + 2 NC contact configuration rated 6 A at 240 VAC, 24 VDC coil 20.8 mA, EN 61810-3 VDE certified, PCB terminals, for safety circuits up to PL e / SIL 3.
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Product Overview
The G7SA-2A2B DC24 is a 4-pole forcibly-guided safety relay in the G7SA slim PCB-mount family, with a 2 NO + 2 NC (DPST-NO + DPST-NC) contact configuration rated 6 A at 240 VAC or 6 A at 30 VDC per pole. The forcibly-guided contact structure (per EN 61810-3) means the NO and NC contacts are mechanically linked so that if one contact welds closed due to overcurrent or end-of-life, the opposite contact cannot close on its own — a critical feature that makes the G7SA suitable for use in Cat 4 / PL e per ISO 13849-1 and SIL 3 per IEC 61508 safety functions.
Where the G7SA-2A2B fits in the G7SA family
The G7SA family is Omron's slim PCB-mount safety relay series, with 4-pole and 6-pole variants: G7SA-2A2B (2 NO + 2 NC, 4 poles, this SKU), G7SA-3A1B (3 NO + 1 NC, 4 poles), G7SA-4A2B (4 NO + 2 NC, 6 poles), G7SA-5A1B (5 NO + 1 NC, 6 poles), and G7SA-3A3B (3 NO + 3 NC, 6 poles). Pick the G7SA-2A2B for the common case of a 2-channel safety output that needs both NO contacts (to drive two contactors) and NC contacts (for monitoring the relay state back to a safety controller). Pick G7SA-3A1B if you need 3 NO outputs and only 1 NC monitor.
Wiring and socket options
The G7SA-2A2B is a PCB-mount relay with through-hole pins. For panel mounting on DIN rail, plug the relay into a P7SA-14F-ND-PU DC24 socket to get screw terminals and a retention clip. For the most common safety application: wire the E-stop or interlock switch to the coil input, connect the two NO contacts to the two contactor coils that need to drop out on safety stop, and wire the NC contact back to the safety controller's EDM input.
Key Features
- 4-pole slim PCB-mount safety relay, 2 NO + 2 NC forcibly-guided contacts
- 6 A at 240 VAC / 6 A at 30 VDC rated contact
- 24 VDC coil, 20.8 mA, 500 mW power consumption
- EN 61810-3, VDE certified — suitable for Cat 4 / PL e / SIL 3 safety circuits
- Forcibly-guided contact structure
- Operating time 30 ms max, response time 10 ms max
- 4,000 VAC dielectric strength coil-to-contact for 1 min
- 50 million mechanical operations minimum, 100,000 electrical
- SKU: G7SA-2A2B DC24
- Series: G7SA (Forcibly-Guided Safety Relay)
- Voltage: 24 VDC
Best-Fit Applications
- Two-channel safety output stage in a Cat 4 / PL e E-stop circuit driving two contactors
- Forcibly-guided safety relay in a guard-door interlock with EDM feedback to safety controller
- Light-curtain monitoring with redundant outputs and a diagnostic NC for EDM
- Two-hand control circuit on a small press
Buying Checklist
- Pick G7SA-2A2B DC24 for 2 NO + 2 NC forcibly-guided safety relay with 24 VDC coil
- Pick G7SA-3A1B for 3 NO + 1 NC, G7SA-4A2B for 4 NO + 2 NC, G7SA-5A1B for 5 NO + 1 NC
- Pick G7SA-2A2B DC12 if your safety controller outputs 12 VDC instead of 24 VDC
- Order P7SA-14F-ND-PU DC24 socket for DIN-rail mount with screw terminals
- For surface-mount with screw terminals use the P7SA-14F-ND DC24 for screw terminals
- Verify the safety category required by your risk assessment before selecting
Technical Specifications
| Model | G7SA-2A2B DC24 |
|---|---|
| Series | G7SA (Forcibly-Guided Safety Relay) |
| Type | Slim PCB-mount safety relay |
| Contact Configuration | DPST-NO + DPST-NC (2 NO + 2 NC) |
| Poles | 4 poles |
| Rated Load (Resistive) | 6 A at 240 VAC / 6 A at 30 VDC |
| Rated Load (Inductive) | 2 A at 240 VAC (cosφ=0.4) |
| Rated Load (DC Inductive L/R=7ms) | 1 A at 30 VDC |
| Coil Rated Voltage | 24 VDC |
| Coil Current | 20.8 mA |
| Must-Operate Voltage | 70 % of rated (16.8 VDC min) |
| Must-Release Voltage | 15 % of rated (3.6 VDC min) |
| Terminal Type | PCB through-hole |
| Mounting Option | PCB or P7SA-14F-ND-PU DC24 socket |
| Operating Temperature | -25 to +70 °C |
Resources & Downloads
FAQ for G7SA-2A2B DC24
What does forcibly-guided contact mean?
Forcibly-guided contacts (per EN 61810-3) are mechanically linked so that if one contact welds closed due to overcurrent or end-of-life, the opposite contact cannot close on its own. This is a critical safety feature — a normal relay with both NO and NC contacts could have a welded NO contact while the NC contact continues to operate, falsely indicating that the NO has dropped out when it has not.
What is the difference between G7SA-2A2B and G7SA-3A1B?
Both are 4-pole forcibly-guided safety relays. The 2A2B has 2 NO + 2 NC contacts (the most common configuration for dual-channel output with EDM feedback). The 3A1B has 3 NO + 1 NC — more safety outputs but only one diagnostic NC. Pick 2A2B for typical Cat 4 dual-channel output with EDM; pick 3A1B if you need three independent safety outputs and one diagnostic.
What socket should I use for the G7SA-2A2B?
Use the P7SA-14F-ND-PU DC24 socket (Push-In Plus screwless terminals) or the P7SA-14F-ND DC24 socket (Phillips screw terminals). Both accept the G7SA-2A2B relay module and provide DIN-rail mounting plus LED indicator. The -PU (Push-In Plus) variant reduces wiring time by about 60 % compared to the screw-terminal version.
What safety category does the G7SA-2A2B achieve?
Up to Category 4 per EN 954-1, Performance Level e per ISO 13849-1, and SIL 3 per IEC 61508, provided the surrounding circuit is wired correctly with two independent channels feeding the inputs and the two NO contacts driving two independent contactors or valves. The force-guided contact construction is what makes the high rating possible — if one contact welds, the other cannot close, and the diagnostic circuit detects the fault.
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