Variant AB40 | Advanced Safety Relay Basic Unit, 24V DC, 3 NO + 1 NC Outputs
The Siemens 3SK1121-2AB40 is an advanced safety relay basic unit from the SIRIUS 3SK1 Series, designed for complex machine safety applications such as emergency stop circuits, safety gate monitoring, light curtain evaluation, and multi-channel safety systems.
It belongs to the Advanced 3SK1 platform, which offers higher flexibility than standard units, supporting expanded safety functions, diagnostics, and modular system integration.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 Advanced |
| Model Number | 3SK1121-2AB40 |
| Variant | AB40 |
| Supply Voltage | 24V DC |
| Output Contacts | 3 NO safety outputs + 1 NC auxiliary output |
| Mounting Type | DIN rail |
| Width | 22.5 mm |
| Terminal Type | Spring / push-in terminals |
| Input Configuration | 1-channel / 2-channel safety devices |
| Safety Functions | E-stop, safety gate, light curtain monitoring |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Mechanical Life | ~10 million operations |
| Electrical Life | ~10 million cycles |
| Shock Resistance | 10 g / 11 ms |
| Vibration Resistance | Up to 0.75 mm (IEC 60068-2-6) |
| Compliance | IEC 61508, ISO 13849-1 |
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