Omron G9SE-201 — 2NO Safety Relay, 24VDC, PLe
SKU: G9SE-201USD 61.50
Omron G9SE-201 is a compact safety relay with 2 safety outputs (DPST-NO), 24 VDC supply, PLe/SIL3 rating, and Push-In Plus terminals — 17.5mm wide for tight safety panels.
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Product Overview
The G9SE-201 is the 2-safety-output model in Omron's G9SE safety relay family. It's used as the safety logic device in Category 4 / PLe (per ISO 13849-1) and SIL3 (per IEC 62061) emergency-stop and guard-door interlock circuits. The '201' code breaks down as: 2 = 2 safety outputs, 0 = no OFF-delay, 1 = standard series. Compare to G9SE-401 (4 safety outputs) and G9SE-221 (2 outputs with OFF-delay). In a typical safety circuit, the G9SE-201 sits between the safety input devices (e-stop button, guard-door interlock switch, safety light curtain) and the downstream contactors or variable frequency drives that need to be cut off in an emergency. When both safety inputs (T12 and T22) are HIGH (i.e., the e-stop is not pressed and the guard is closed), the safety outputs (terminals 13-14 and 23-24) close and the machine runs. When either input goes LOW (e-stop pressed or guard opened), the outputs open within 15ms, breaking the holding current to the contactors and stopping the machine. The G9SE-201 supports two wiring modes: - 1-channel safety input: both T12 and T22 tied together, used for simple e-stop circuits. This gives Category 1 / PLc only — single-fault tolerant. - 2-channel safety input: T12 and T22 are separate, typically wired to a 2-N/C contact e-stop or a magnetic-coded safety switch. This is the standard for Category 4 / PLe and SIL3 — dual-fault tolerant. For Category 4 / PLe, you also need the EDM (External Device Monitoring) feedback loop from the downstream contactors. Wire the N/C auxiliary contacts of the contactors back to the G9SE's T31/T32 feedback input. The G9SE checks that the contactors actually de-energised within the expected time. If the contactors fail to drop out (welded contact), the G9SE locks out and prevents re-starting until the fault is cleared. On the wiring side, the G9SE-201 uses Push-In Plus terminals — no screwdriver, no torque wrench. Strip 8mm of insulation, push the wire in. To release, press the orange release button with a flat-blade screwdriver or a 2.5mm test pin. The terminals accept solid wire, stranded with ferrules, or even bare stranded if you're careful. The 17.5mm width and 100mm height make the G9SE-201 the most compact PLe safety relay in Omron's line. For comparison, the G9SA is older technology in a 17.5mm package but only Category 4 with screw terminals; the G9SB is similar but with slightly different terminal layout. For new designs, the G9SE is the recommended pick — Push-In terminals save wiring time, and the LED indicators make troubleshooting faster.
Key Features
- 2 normally open safety contacts
- Forced-guided contacts for fail-safe
- 24VDC operating voltage
- Category 4 / SIL3 compliant
- 22.5mm compact width
- DIN rail mounting
- LED status indicators
- SKU: G9SE-201
- Series: G9SE
Best-Fit Applications
- Safety logic for e-stop circuits on standalone machine tools
- Guard-door interlock for CNC machining centers requiring Category 4 / PLe
- Safety light curtain integration on packaging lines for hand-protection zones
- Two-hand control circuits on press brakes requiring both hands to operate the cycle
Buying Checklist
- PLe / SIL3 in a 17.5mm wide package — the most compact PLe safety relay in Omron's line
- Push-In Plus terminals save wiring time vs screw-type — typically 30-50% faster panel build
- LED indicators on the front show power, safety input state, and output state for fast troubleshooting
- Configurable 1-channel or 2-channel safety input for Category 1 or Category 4 applications
- EDM feedback loop monitors downstream contactor health and locks out on welded-contact faults
Technical Specifications
| Model | G9SE-201 |
|---|---|
| Series | G9SE |
| Type | Safety Relay Unit |
| Contact Configuration | 2NO |
| Supply Voltage | DC24V |
| Safety Category | Category 3, PL d |
| Operating Temperature | -10 to +55°C |
| Mounting | DIN rail |
| Certifications | CE, TUV, UL, CSA |
Resources & Downloads
FAQ for G9SE-201
What's the difference between G9SE-201 and G9SE-401?
G9SE-201 has 2 safety outputs (DPST-NO); G9SE-401 has 4 safety outputs. Use G9SE-201 when your machine has 2 contactors that need to be cut off (typical single-motor machine with a forward and reverse contactor, or a 2-channel safety contactor setup). Use G9SE-401 when you need to control 4 separate outputs, e.g., 2 contactors + 2 servo drives in STO (safe torque off) mode.
Can G9SE-201 be used for Category 4 / PLe?
Yes — when wired in 2-channel mode with EDM feedback, the G9SE-201 achieves Category 4 / PLe per ISO 13849-1 and SIL3 per IEC 62061. The 1-channel mode is only Category 1 / PLc, which is acceptable for low-risk machinery but not for hazardous applications.
What does the OFF-delay do on the G9SE-221?
The G9SE-221 has the same 2 safety outputs as the 201, but with configurable OFF-delay (0.5s or 3s options on T05 and T30 variants). The OFF-delay is used for controlled-stop applications: when the e-stop is pressed, the safety outputs stay closed for the delay period, allowing a controlled deceleration of the machine before the contactors drop. This is required for machines with high inertia (large flywheels, conveyor belts) where a hard stop would damage the product or the machine.
Do I need to wire the EDM feedback loop?
For Category 4 / PLe with 2-channel input, yes — the EDM loop is required. Wire the N/C auxiliary contacts of the downstream contactors back to the G9SE T31/T32 terminals. The G9SE will lock out if it detects that the contactors didn't de-energise within the expected time. For Category 1 or 3 applications, the EDM loop is optional but recommended as a diagnostic.
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