OMRON G9SA — Safety Relays
Omron G9SA: expandable safety relay unit; 3 or 5 safety contacts, OFF-delay up to 30 s, two-hand controller, 24 V AC/DC or 100–240 V AC.
Status: In production
Brand: Omron
Product: Expandable safety relay unit (45 mm, PL e / Category 4)
Safety level: PL e / Category 4 (EN ISO 13849-1), except some models
Master units: 3PST-NO, 5PST-NO, 3PST-NO + DPST-NO OFF-delayed, two-hand controller
Supply voltage: 24 V AC/DC or 100 to 240 V AC
Contact rating: 250 V AC 5 A, 30 V DC 5 A (resistive)
Width: Master unit 45 mm, expansion unit 17.5 mm
The Omron G9SA family consists of compact and expandable safety relay units. There are four 45 mm wide master units: the 3-pole G9SA-301, the 5-pole G9SA-501, the G9SA-321-T with 3 instantaneous and 2 OFF-delayed poles, and the G9SA-TH301 two-hand controller. The 17.5 mm wide G9SA-EX301 and OFF-delayed G9SA-EX031-T expansion units connect via the front connector, so safety contacts can be multiplied easily. Master units accept 1-channel or 2-channel input; the two-hand controller uses 2 channels. The units conform to EN ISO 13849-1 PL e / Category 4 (except some models).
Contacts are rated 250 V AC 5 A and 30 V DC 5 A resistive, with a rated carry current of 5 A. The operating time is 30 ms max. and the response time 10 ms max. On OFF-delay models the delay is set in 15 steps, with a maximum of 7.5 s on T075, 15 s on T15 and 30 s on T30. Mechanical durability is 5,000,000 operations min. and electrical durability 100,000 operations min. The supply is 24 V AC/DC or 100 to 240 V AC and must be specified when ordering. DIN track or screw mounting is possible; the operating temperature is −25 to 55 °C.
Omron G9SA technical specifications
| General | |
|---|---|
| Input channels | 1 or 2 channels (two-hand controller: 2 channels) |
| Reset mode | Manual or automatic (selected with terminals A – B) |
| Mounting | DIN track or screw mounting |
| Safety ratings | |
| Performance level / category | PL e / Category 4 (EN ISO 13849-1), except some models |
| OFF-delay settings | 15 steps; T075: 0.5 to 7.5 s, T15: 1 to 15 s, T30: 2 to 30 s |
| Electrical characteristics | |
| Power supply voltage | 24 V AC/DC (24 V AC 50/60 Hz or 24 V DC); 100 to 240 V AC 50/60 Hz |
| Operating voltage range | 85% to 110% of rated supply voltage |
| Input current | 40 mA max. (301 / 321-T / TH301); 60 mA max. (501) |
| Rated load (resistive) | 250 V AC 5 A; 30 V DC 5 A |
| Rated carry current | 5 A |
| Contact resistance | 100 mΩ |
| Isolation voltage (Ui) / impulse withstand voltage (Uimp) | 250 V AC / 4 kV |
| Outputs and indicators | |
| Operating time | 30 ms max. (not including bounce time) |
| Response time | 10 ms max. |
| Mechanical durability | 5,000,000 operations min. (approx. 7,200 operations/h) |
| Electrical durability | 100,000 operations min. (approx. 1,800 operations/h) |
| Minimum permissible load (reference) | 5 V DC, 1 mA |
| Environmental | |
| Ambient operating temperature | −25 to 55 °C (no icing or condensation) |
| Storage temperature | −25 to 85 °C |
| Ambient operating humidity | 35% to 85% |
| Vibration / shock resistance | 10 to 55 to 10 Hz, 0.375 mm single amplitude / destruction 300 m/s², malfunction 100 m/s² |
| Mechanical and connection | |
| Terminal tightening torque | 0.6 N·m |
Omron G9SA models
| Code | Main contacts | OFF-delay contacts | Auxiliary contact | Max. OFF-delay | Width | Power consumption (24 V AC/DC) | Weight |
|---|---|---|---|---|---|---|---|
| G9SA-301 | 3PST-NO | — | SPST-NC | — | 45 mm | 5.7 VA / 1.7 W max. | Approx. 210 g |
| G9SA-501 | 5PST-NO | — | SPST-NC | — | 45 mm | 7.4 VA / 2.6 W max. | Approx. 270 g |
| G9SA-321-T075 | 3PST-NO | DPST-NO | SPST-NC | 7.5 s | 45 mm | 8.6 VA / 3.3 W max. | Approx. 270 g |
| G9SA-321-T15 | 3PST-NO | DPST-NO | SPST-NC | 15 s | 45 mm | 8.6 VA / 3.3 W max. | Approx. 270 g |
| G9SA-321-T30 | 3PST-NO | DPST-NO | SPST-NC | 30 s | 45 mm | 8.6 VA / 3.3 W max. | Approx. 270 g |
| G9SA-TH301 | 3PST-NO | — | SPST-NC | — | 45 mm | 5.7 VA / 1.7 W max. | Approx. 210 g |
| G9SA-EX301 | 3PST-NO | — | SPST-NC | — | 17.5 mm | Adds 2 VA / 2 W max. to master unit | Approx. 130 g |
| G9SA-EX031-T075 | — | 3PST-NO | SPST-NC | 7.5 s | 17.5 mm | Adds 2 VA / 2 W max. to master unit | Approx. 130 g |
| G9SA-EX031-T15 | — | 3PST-NO | SPST-NC | 15 s | 17.5 mm | Adds 2 VA / 2 W max. to master unit | Approx. 130 g |
| G9SA-EX031-T30 | — | 3PST-NO | SPST-NC | 30 s | 17.5 mm | Adds 2 VA / 2 W max. to master unit | Approx. 130 g |
Key features
- 45 mm master units, 17.5 mm expansion units
- Safe OFF-delay timer (15 steps)
- Simple expansion connection on the front
- Two-hand controller option
- 24 V AC/DC and 100 to 240 V AC supply options
- DIN track and screw mounting
G9SA ordering codes
| Part number | Description |
|---|---|
| G9SA-301 | Emergency-stop unit, 3PST-NO + SPST-NC, 1 or 2 channels, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-501 | Emergency-stop unit, 5PST-NO + SPST-NC, 1 or 2 channels, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-321-T075 | Emergency-stop OFF-delay unit, 3PST-NO + DPST-NO OFF-delayed (7.5 s) + SPST-NC, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-321-T15 | Emergency-stop OFF-delay unit, 3PST-NO + DPST-NO OFF-delayed (15 s) + SPST-NC, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-321-T30 | Emergency-stop OFF-delay unit, 3PST-NO + DPST-NO OFF-delayed (30 s) + SPST-NC, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-TH301 | Two-hand controller, 3PST-NO + SPST-NC, 2 channels, 24 V AC/DC or 100 to 240 V AC (specify when ordering) |
| G9SA-EX301 | Expansion unit, 3PST-NO + SPST-NC; connects to G9SA-301 / 501 / 321 / TH301 |
| G9SA-EX031-T075 | Expansion unit with OFF-delay outputs, 3PST-NO (7.5 s) + SPST-NC |
| G9SA-EX031-T15 | Expansion unit with OFF-delay outputs, 3PST-NO (15 s) + SPST-NC |
| G9SA-EX031-T30 | Expansion unit with OFF-delay outputs, 3PST-NO (30 s) + SPST-NC |
Other Omron Safety Relays
- OMRON G9SE — Slim safety relay unit (17.5 / 22.5 mm, PL e)
- OMRON G9SB — Slim safety relay unit (17.5 / 22.5 mm)
- OMRON G9SR — Compact safety relay unit (modular, PL e / SIL 3)
- OMRON G9SX — Scalable hardwired safety controller (flexible safety unit, PL e / SIL 3)
- OMRON G7SA — Relay with forcibly guided contacts (4 / 6 poles, 6 A)
Models from other brands: Safety Relays
Is this safety relay right for your application?
Share the safety inputs to be connected (emergency stop, door switch, light curtain), the number of output contacts, the need for off-delayed outputs, the supply voltage and the required performance level (PL); let’s select the right unit together.
All product specifications are subject to change without notice. Validation of the safety function and the risk assessment remain the responsibility of the machine builder. Source: Omron industrial.omron.eu/en/products/g9sa; G9SA Safety Relay Unit datasheet, CSM_G9SA_DS_E_11_15 (accessed 25 September 2026).