1-channel isolated barrier, 24 V DC supply (Power Rail), Input for approved dry contacts or SN/S1N sensors, Relay contact output, Fault indication output, Line fault detection (LFD), Up to SIL 3 acc. to IEC/EN 61508, Up to PL d acc. to EN/ISO 13849, Housing width: 40 mm, Number of channels: 1-channel, Safety Integrity Level (SIL): SIL 3, Rated voltage: 20 ... 35 V DC, Field device: SN/S1N sensor, Field device [2]: volt-free contact, Line fault detection, Type: 2 x relay (NO contact)