Switch Amplifier HiC2821, 1-channel isolated barrier, 24 V DC supply (bus powered), Dry contact or NAMUR input, Usable as signal splitter (1 input and 2 outputs), 2 relay contact outputs, Fault relay contact output, Line fault detection (LFD), Reversible mode of operation, Up to SIL 2 acc. to IEC/EN 61508