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. Q555.2 - 20A 4 Pin 24 Hour Round Time Switch The Q555 time switches are robust, 20amp switches that are ideal for the switching of heating and lighting applications- up to three times a day. The Q555 has a 4-pin base which means it has independent motor switching connections which enable a different switching circuit voltage from the voltage powering the time switch. The Q555 has a 100 hour battery reserve which is useful should there be a power failure. The day omit feature means you can skip any day of the week if necessary. There is also a manual override button for your convenience. Programming: 24 hour Current Rating: 20A Connection Pins: 4 Battery Reserve: 100 hours Day Omit Dial: Yes (Omits the ‘ON’ operation) Fixing: Surface Mounting Ingress Protection: IP20 Operating Temperature: 0°C to 50°C Dimensions: 146.5mm x 105.7mm x 82mm Display: 24 Hourr Dial Timing Accuracy: 5 Minutes/Year Contact Type: SPST