Omron G9SA-301 AC-DC24 — Safety Relay, 3NO/1NC, 24 V AC/DC
SKU: G9SA-301 AC-DC24USD 75.00
G9SA-series safety relay unit, 3 NO safety contacts + 1 NC aux, auto-reset, 24 V AC/DC supply, 45 mm DIN-rail housing, PLe/SIL 3.
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Product Overview
The Omron G9SA-301 AC/DC24 is a compact safety relay unit from the G9SA family — 3 NO safety contacts plus 1 NC auxiliary contact, 24 V AC/DC supply, automatic reset, and a 45 mm-wide DIN-rail housing. It monitors a dual-channel safety input from devices like E-stop buttons, guard-door switches, safety light curtains, or two-hand controls, and switches its safety outputs to a Category 4 / PL e / SIL 3 level when the safety circuit is intact.
The G9SA family is Omron's mid-size safety-relay line: narrower than the G9SA-TH301 two-hand module, and simpler than the G9SE programmable safety controllers. The 301 suffix means "3 safety contacts, no OFF-delay" — the most common configuration for E-stop and guard-door circuits that need a single stop category without time-delayed release.
Where the G9SA-301 fits on a safety circuit
Typical wiring pairs a dual-channel E-stop button or a D4NS / D4NL guard switch as the input device. When both channels close (button released, guard closed), the G9SA energises the 3 NO safety outputs to the contactors or drives downstream. Pressing the E-stop or opening the guard opens the safety loop, the G9SA drops the NO outputs within its 100 ms response window, and the downstream contactors drop the motor power. The 1 NC auxiliary contact is used for monitoring or for the reset-feedback loop.
Selecting this variant vs other G9SA units
In the same 45 mm body, the G9SA-321 adds two OFF-delay contacts for controlled-stop categories (1–15 s in 15 steps). The G9SA-501 has 5 NO safety contacts for circuits that need to drive more contactors. The G9SA-TH301 has the two-hand-control logic for press applications. For broader monitoring with diagnostics, the G9SE-201 or G9SP safety controllers offer configurable logic in a similarly compact body.
Before ordering
Wire the input as dual-channel (two NC contacts in series, cross-monitored) for any Cat 4 / PL e application — a single-channel wiring caps out at lower categories. Check that the panel supply is genuinely 24 V AC or 24 V DC; there are also 100–240 VAC supply variants of the G9SA family that look similar on the front label. The 3 NO contacts are rated 5 A at 250 VAC and 5 A at 30 VDC for resistive loads — derate to about 1.5 A for inductive AC-15 use. Always wire a fuse on the contactor side (10 A gG / gI).
Key Features
- G9SA family, compact 45 mm DIN-rail housing
- 3 NO safety outputs + 1 NC aux output (3PST-NO + SPST-NC)
- 24 V AC/DC supply (50/60 Hz)
- Auto-reset / manual-reset switchable on the front
- Cross-monitoring dual-channel safety input
- Up to Category 4 / PL e (ISO 13849-1), SIL 3 (IEC 61508) with proper wiring
- Compatible with E-stop, guard-door, safety-curtain, and two-hand devices
- Approvals: UL, CSA, TÜV (BG), CE
- SKU: G9SA-301 AC-DC24
- Series: G9SA compact safety relay (45 mm DIN-rail)
- Voltage: 24 V
Best-Fit Applications
- Single-stop E-stop and sliding-guard monitoring on a packaging, assembly, or transfer machine
- Dual-channel guard-door switch (D4NS, D4NL) interface for a mid-size machine cell
- Backup safety relay for a safety light curtain output (F3S, MS4800)
- Drives contactors or servo drive STO inputs in a Category 4 / PL e stop circuit
- Refit of an older G7SA / G9S-series safety relay on an existing machine
Buying Checklist
- Confirm the panel supply really is 24 V AC or 24 V DC — the G9SA-301 AC/DC24 is not interchangeable with the 100–240 VAC variants.
- Wire the input as dual-channel NC with cross-monitoring for any Cat 4 / PL e application; single-channel wiring caps out below the headline safety level.
- Use the front reset switch to choose auto or manual reset — manual is the safer default for E-stop circuits that must be deliberately reset.
- Derate the 5 A NO contact rating for inductive loads (AC-15): about 1.5 A at 250 VAC — pull from the load's contactor coil through the G9SA, not from a big motor directly.
- Add the front-mounted TÜV / UL marking sticker to the safety file — the G9SA is approved to EN 954-1 / ISO 13849-1 PL e and SIL 3 with the correct wiring.
Technical Specifications
| Model | G9SA-301 AC/DC24 |
|---|---|
| Series | G9SA compact safety relay (45 mm DIN-rail) |
| Contact Form | 3 NO safety contacts + 1 NC aux |
| Supply Voltage | 24 V AC/DC (50/60 Hz) |
| Reset Mode | Auto / Manual (front switch) |
| Response Time | ≤100 ms |
| Rated Load (NO) | 5 A at 250 VAC / 30 VDC resistive |
| Safety Category | Up to Cat 4 / PL e (ISO 13849-1), SIL 3 |
| Operating Temperature | -25 to +55 °C |
| Mounting | DIN rail (35 mm) or M4 screw |
| Dimensions | 45 × 90 × 76 mm (W × H × D) |
| Approvals | UL, CSA, TÜV (BG), CE |
Resources & Downloads
FAQ for G9SA-301 AC-DC24
What is the difference between G9SA-301, G9SA-321, and G9SA-501?
G9SA-301 has 3 NO safety contacts with no time delay. G9SA-321 replaces two of those with OFF-delay contacts (1–15 s in 15 steps) for controlled-stop circuits. G9SA-501 has 5 NO safety contacts for circuits that need to drop more contactors in one stop event. Pick the 301 for the common E-stop / guard-door wiring.
What safety level does the G9SA-301 reach?
Up to Category 4 / PL e under ISO 13849-1 and SIL 3 under IEC 61508, but only when wired with a dual-channel input from a monitored device such as an E-stop button or a D4NS / D4NL guard switch. A single-channel wiring tops out at a lower safety category — check the safety function in the machine's risk assessment.
Can I use the G9SA-301 with a safety light curtain?
Yes. Wire the light curtain's two OSSD outputs to the G9SA dual-channel input — most safety curtains with PNP OSSD outputs (Omron F3S, SICK, Keyence) are plug-compatible. The G9SA switches its 3 NO contacts when the curtain is clear; the curtain is detected as a "fault" if the OSSE/OSSD pair ever short to each other (cross-monitoring).
Does the G9SA-301 need a reset button?
It depends on the safety function. The front switch selects auto-reset (contacts close when the input recovers) or manual reset (an external NO button must pulse T31/T32 to close the outputs again). Manual reset is the standard for E-stop circuits to force a deliberate reset action before the machine restarts.
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