Overview
The 3RK3131-1AC10 is a Siemens 3RK31 central unit, a compact safety-oriented control module with 4/8 fail-safe digital inputs, 1 fail-safe relay output, and 1 fail-safe digital output. It draws 4.5 W and is rated IP20 for in-cabinet mounting via DIN-rail snap-fit or screw-mount with the push-in lug.
Function & operation
The unit supports 64-bit cyclical data when paired with a DP interface module, enabling PROFIBUS DP integration for safety-related I/O in distributed architectures. The 2-channel structure (has_2_channel: True) aligns with SIL 3 / PL e redundancy requirements.
Installation & environment
Snap-mounted to DIN rail or screw-mounted with the push-in lug; screw-type terminals accept 20–14 AWG wire. Pollution degree 3 means the module tolerates conductive pollution typical in industrial enclosures without conformal coating. Altitude limit is 2000 m; above that, derate creepage distances. The EMC classification is Class A only — not for residential use without mitigation measures. Finger-safe touch protection is provided on the terminals. Dimensions are 133.00 x 52.5 x 133.00 mm; the 45 mm width fits standard 45 mm DIN-rail terminal blocks for neat panel layout.
Lifecycle & compliance
RoHS compliance is documented since 28-05-09. No lifecycle status (active / phase-out / obsolete) is listed in the evidence; confirm current availability with a quote. The unit carries no UL or IEC certification in the evidence — request documentation from the supplier for site acceptance.