Omron G9SA-501 AC-DC24V — 5 NO + 1 NC Safety Relay
SKU: G9SA-501 AC-DC24VUSD 95.00
G9SA-series safety relay, 5 NO safety contacts + 1 NC aux, 1 or 2 channels, manual or auto reset, AC/DC 24 V supply, DIN-rail.
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Product Overview
The Omron G9SA-501 AC-DC24V is the 5 NO + 1 NC safety relay in the G9SA compact family. The five normally-open contacts switch the safety output -- main contactor coils, secondary contactor coils, an indicator lamp, a holding loop -- from a single e-stop or guard-door input. The one NC contact is a non-safety aux that follows the relay state for a host PLC or indicator panel. The 5 A at 250 VAC / 30 VDC contact rating drives AC contactor coils directly without an interposing relay.
What the channel and reset DIP switches do
The bottom of the unit carries two DIP switches. The channel switch picks 1-channel (single e-stop loop) or 2-channel (dual-wire e-stop / guard-door switch -- required for Cat 4 / PL e). The reset switch picks manual reset (operator must press a reset button after the safety input re-closes) or auto reset (relay re-closes as soon as the input re-closes). Manual reset is required for most Cat 3 / PL d and Cat 4 / PL e installations -- auto reset is only allowed when the operator cannot reach into the danger zone after a trip.
Choosing the 5 NO vs the 3 NO head
Pick the G9SA-501 (this SKU) when the safety circuit switches two or three contactor coils and one or two indicator lamps -- the 5 NO contacts cover a forward / reverse contactor pair, a third safety contactor, and a non-safety indicator. Pick the G9SA-301 (3 NO + 1 NC) instead when the circuit only needs one or two contactor coils -- the smaller 17.5 mm body saves DIN-rail space. Add a G9SA-EX301 expansion (3 NO + 1 NC) if a single G9SA-301 is not enough.
Before ordering
Confirm the supply is 24 V -- for 100-240 VAC cabinets, order the G9SA-501 AC100-240 instead. Pair the relay with a direct-opening input device (e-stop, guard-door switch, safety limit switch) and a monitored contactor. The safety category is set by the wiring, the input device, and the contactor monitoring -- not by the G9SA relay alone.
Key Features
- G9SA-series compact safety relay, 22.5 mm DIN-rail body
- 5 NO safety contacts (5PST-NO) + 1 NC aux contact (SPST-NC)
- 5 A at 250 VAC / 30 VDC resistive contact rating per NO
- 1-channel or 2-channel input selectable on the bottom DIP switch
- Manual or auto reset selectable on the bottom DIP switch
- AC/DC 24 V universal supply (the AC100-240 suffix is the 100-240 V sibling)
- 30 ms or less operate, 10 ms or less release response
- 5,000,000 mechanical operations / 100,000 electrical operations minimum
- Green PWR LED + red ERR LED on the front face
- M3.5 screw terminals at 0.98 N·m torque, -25 to +55 C operating, 35-85 % RH
- UL 508 / CSA / TÜV SÜD / CCC / EN 60947-5-1 / EN ISO 13849-1 approved
- SKU: G9SA-501 AC-DC24V
- Series: G9SA-501
- Voltage: 24 V
- I/O: 1 I/O
Best-Fit Applications
- E-stop circuit switching two contactor coils + one indicator on a small machine tool
- Guard-door interlock on a robot cell with forward / reverse contactor + indicator pair
- Safety light curtain output switching two safety contactor coils on a packaging line
- Two-hand control upgrade when the existing relay has more NO contacts than the new circuit needs
- Safety mat or safety edge monitoring on a hydraulic press guard with monitored contactor
Buying Checklist
- Pick G9SA-501 AC-DC24V for a 5 NO + 1 NC safety relay on AC/DC 24 V supply in the G9SA 22.5 mm DIN-rail body.
- Pick G9SA-301 AC-DC24 instead when the circuit only needs 3 NO + 1 NC -- the smaller 17.5 mm body saves DIN-rail space.
- Pick G9SA-EX301 to add 3 NO + 1 NC expansion to an existing G9SA-301 (same AC/DC 24 V supply).
- Pick G9SA-501 AC100-240 when the cabinet has 100-240 VAC supply (not AC/DC 24 V).
- Pick G9SA-321-T075 / T15 / T30 when the e-stop needs an OFF-delay (3 NO + 2 NO delayed + 1 NC).
- Set the channel DIP switch to 2-channel and the reset DIP switch to manual for typical Cat 3 / PL d or Cat 4 / PL e installations.
Technical Specifications
| Contact Form | 5 NO safety contacts + 1 NC aux (5PST-NO + SPST-NC) |
|---|---|
| Contact Rating | 5 A at 250 VAC / 30 VDC resistive |
| Input Channels | 1 or 2 channels, DIP-switchable |
| Reset Mode | Manual or auto reset, DIP-switchable |
| Supply Voltage | AC/DC 24 V universal |
| Operate / Release | 30 ms or less / 10 ms or less |
| Mechanical Life | 5,000,000 operations minimum |
| Electrical Life | 100,000 operations minimum at 1,800 ops/hour |
| Indicators | Green PWR LED + red ERR LED on the front face |
| Terminals | M3.5 screw, 0.98 N·m torque |
| Dimensions / Mounting | 45 W x 111 H x 94 D mm, DIN-rail, ~270 g |
| Operating Temperature | -25 to +55 C, 35-85 % RH |
Resources & Downloads
FAQ for G9SA-501 AC-DC24V
What is the difference between G9SA-501 and G9SA-301?
Contact count. The G9SA-501 is 5 NO + 1 NC in a 22.5 mm body. The G9SA-301 is 3 NO + 1 NC in a 17.5 mm body. The supply, response time, mechanical life, and approval list are identical. Pick the 501 when the circuit switches three or four contactor coils or indicator lamps; pick the 301 when the circuit only switches one or two contactor coils. For more than 5 NO, add a G9SA-EX301 expansion (3 NO + 1 NC) to the 301 or 501.
Does the G9SA-501 AC-DC24V reach Cat 4 / PL e by itself?
No. The safety category is set by the wiring, the input device, and the contactor monitoring -- not by the relay. For Cat 4 / PL e you need: (1) the G9SA set to 2-channel input, (2) an e-stop or guard switch with certified direct opening (D4NS / D4NL / D4SL), (3) two contactor coils each with a NC mirror contact fed back to the G9SA, and (4) manual reset. With single-channel wiring or single-contact input devices, the achievable category drops to Cat 1 / PL c at most.
What is the difference between AC/DC24 and AC100-240 supply?
Supply range. The AC/DC24 suffix accepts 24 VAC or 24 VDC on the same two terminals -- the common pick for a 24 VDC control cabinet. The AC100-240 suffix accepts 100-240 VAC on the same terminals -- the common pick for an AC control cabinet. The contact form, response time, and approvals are identical. Pick the AC/DC24 for a 24 VDC cabinet; pick the AC100-240 for a 100-240 VAC cabinet.
Does the G9SA-501 need a separate reset button?
Only when the DIP switch is set to manual reset. In manual reset mode, the relay waits for a momentary NO pushbutton between the reset terminal and 24 V before re-closing the safety contacts after the safety input re-closes. In auto reset mode, the relay re-closes as soon as the safety input re-closes. Manual reset is required for most Cat 3 / PL d and Cat 4 / PL e installations because it forces the operator to verify that the danger zone is clear before re-energising the machine.
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