1-channel isolated barrier, 24 V DC supply (Power Rail), Dry contact or NAMUR inputs, Input frequency 1 mHz ... 5 kHz, 2 relay contact outputs, Start-up override, Configurable by keypad, Line fault detection (LFD), Up to SIL 2 acc. to IEC/EN 61508 / IEC/EN 61511, Housing width: 40 mm, Number of channels: 1-channel, Trip relay, Start-up override, Rotation speed monitoring, Safety Integrity Level (SIL): SIL 2, Rated voltage: 20 ... 30 V DC, Field device: NAMUR sensor, Field device [2]: volt-free contact