1-channel isolated barrier, 24 V DC supply (Power Rail), Input for approved dry contacts or SN/S1N sensors, Active output, 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: 20 mm, Number of channels: 1-channel, Safety Integrity Level (SIL): SIL 3, Rated voltage: 20 ... 30 V DC, Field device: SN/S1N sensor, Field device [2]: volt-free contact, Line fault detectionpa