Part of the Omron Safety Relays series — see the full model table, lifecycle status and replacement parts.
Omron G7SA-3A1B — 4 Pole Safety Relay, 3 NO + 1 NC
SKU: G7SA-3A1BUSD 8.25
G7SA safety relay with forced-guided 3PST-NO + SPST-NC contacts, 6 A at 250 VAC, 24 VDC coil, for P7SA-10F socket.
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Product Overview
The Omron G7SA-3A1B is the 4-pole (3PST-NO + SPST-NC) version of the G7SA safety relay family. manufactured by Omron Corporation. Hengyixin Automation stocks this relay in Xiamen and ships within 3-5 business days; safety-rated components ship with a batch-trace certificate.
The forced-guided contact mechanism per EN 50205 / Class A VDE means the NO and NC contacts are mechanically linked -- a welded NO contact cannot leave the NC contact in a wrong state. That is the certification that lets the relay contribute to a Cat 1 / PL c up to Cat 3 / PL d interlock when paired with the right safety controller and dual-channel wiring.
For the upstream safety controller, the G9SA-301 handles up to Cat 4 / PL e dual-channel with one G7SA-3A1B downstream; the G9SP-N20S is the standalone safety PLC option.
Key Features
- 6 A at 250 VAC / 6 A at 30 VDC resistive contact rating
- 2 A at 240 VAC AC-15, 1 A at 24 VDC DC-13 inductive rating
- G7SA-series 4-pole plug-in safety relay with forced-guided contacts per EN 50205 / Class A VDE
- -40 to +85 C operating, 5 to 85 % RH, ~17 g, EN 50205 / VDE certified
- SKU: G7SA-3A1B
- Series: G7SA-3A1B
- Voltage: 24 VDC
Best-Fit Applications
- Two-hand control output relay on a press or punch machine
- Guard-door interlock output relay downstream of a G9SA-301 or G9SP-N20S safety controller
- Light curtain output relay where the controller has no spare output channels
Buying Checklist
- Pick the P7SA-10F-ND-PU DC24 for the Push-In Plus terminal version (faster wiring, no screwdriver).
- Pick G7SA-2A2B DC24 instead when the application needs 2 NO + 2 NC contacts in the same 4-pole body.
- Pick G7SA-5A1B DC24 when a 6-pole (5 NO + 1 NC) safety relay is required -- needs the P7SA-14F 14-pin socket.
Technical Specifications
| Contact Form | 3PST-NO (3a) + SPST-NC (1b) -- 4 poles, forced-guided |
|---|---|
| Contact Rating | 6 A at 250 VAC / 6 A at 30 VDC resistive |
| Inductive Rating | 2 A at 240 VAC AC-15 / 1 A at 24 VDC DC-13 (IEC 60947-5-1) |
| Coil Voltage | 24 VDC (also 12 / 18 / 21 / 48 / 110 VDC) |
| Coil Current | 15 mA at 24 VDC, 1,600 ohm coil resistance |
| Operate / Release | Operate 75% of rated or less / release 10% of rated or more |
| Operate Time | 20 ms or less |
| Response Time | 10 ms or less |
| Release Time | 20 ms or less |
| Mechanical Life | 10,000,000 operations minimum at 36,000 ops/h |
| Electrical Life | 100,000 operations minimum at rated load, 1,800 ops/h |
| Operating Temperature / Weight | -40 to +85 C (12-48 VDC), 5-85% RH, ~17 g |
FAQ for G7SA-3A1B
Does the G7SA-3A1B need a socket?
Yes. The G7SA-3A1B is the bare 4-pole relay with ten pins -- it needs the P7SA-10F socket (M3 screw terminal) or the P7SA-10F-ND (with action indicator LED) for DIN-rail or panel mounting. The P7SA-10F-ND-PU DC24 is the Push-In Plus terminal version for faster wiring. The PCB back-mount socket is the P7SA-10P. Without a socket, the bare relay cannot be wired into a control cabinet. Order the socket and the relay together.
What is the difference between G7SA-3A1B and G7SA-2A2B?
Contact arrangement. The G7SA-3A1B is 3PST-NO + SPST-NC (three normally-open and one normally-closed contact, four poles total). The G7SA-2A2B is 2DPST-NO + 2DPST-NC (two normally-open and two normally-closed, also four poles). Both use the same P7SA-10F socket, the same 6 A contact rating, and the same forced-guided EN 50205 certification. Pick the 3A1B when the safety output needs more NO contacts; pick the 2A2B when the application needs equal NO and NC contacts for mirror-contact monitoring.
Can the G7SA-3A1B reach Cat 4 / PL e by itself?
No. The G7SA-3A1B is a single 4-pole relay with forced-guided contacts. The safety category is set by the wiring, the input device, and the contactor monitoring -- not by the relay alone. For a Cat 1 / PL c interlock, wire the G7SA-3A1B's NC contact in series with the contactor coil. For a Cat 3 / PL d interlock, use two channels of input with cross-monitoring and a G9SA-301 or G9SP-N20S safety controller upstream of the G7SA-3A1B. The G7SA-3A1B provides the certified direct-opening contacts needed to support a Cat 1 / PL c or Cat 3 / PL d circuit, but it does not claim those categories on its own.
Is the G7SA-3A1B the same as a G7S-3A1B?
No. The G7SA is the slim plug-in safety relay family with forced-guided contacts per EN 50205 / Class A VDE, 6 A contact rating, 10 million mechanical operations. The G7S is the older safety relay family with a larger case and lower contact rating. The G7SA is the current pick for new builds; the G7S is typically encountered as a like-for-like replacement on existing panels. The P7SA socket is the G7SA socket; the G7S uses a different P7S socket. Verify the model code on the existing relay before ordering the replacement.
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