The 857-090 is a 2A 12V dc power supply that is supplied without housing.
This unit is part of a range of 12V dc power supplies for use with Paxton systems. All are designed to connect to a standard UK mains supply via a switched fused spur connection.
Paxton 998-241
2A 12V dc
Supplied in plastic enclosure
Connects to standard UK mains supply
100-240V AC main