Sangamo are a UK manufacturer of time clocks/heating controls, thermostats, immersion controllers & programmers. The brand is also recognised for their Round Pattern Time Switches. PSPBF - 13A Powersave Plus Boost Controller with Fuse Protection 30 Mins, 1 Hour and 2 Hour Boost Function Clear Indication LEDs Single Gang Surface (Mount Box Included) or Flush Mounting Supplied with Replaceable BS1362 13A Fuse 13A Switch Rating 240vAC Boosts: 30 Minutes, 1 Hour, 2 Hours Ingress Protection: IP20 Temperature Rating: T40 Fixing: Single Pattress - Surface and Flush Mounting Operating Temperature: -10°C to 40° Material: ABS Dimensions: 86mm x 86mm x 35mm (9mm D without Black Box)