{"product_id":"sangamo-astro-zone-1-4-pin-time-switch-1-on-off-optional-early-off-20a","title":"Sangamo Astro Zone 1 4-Pin Time Switch 1 On\/Off Optional Early Off - 20A","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Sangamo Astro Zone 1 is a 4-pin astronomical time switch with a 20A rating, designed to control lighting and heating circuits based on sunrise and sunset times for Zone 1 geographical locations. The unit programmes one on\/off operation per 24-hour cycle, with an optional early-off function that allows the circuit to switch off before the scheduled sunset time if required.\u003c\/p\u003e\n\u003cp\u003eDesigned for installation in domestic and commercial consumer units, the time switch fits standard DIN rail mounting and automates control of outdoor lighting, security lighting, street lighting and heating circuits without requiring manual adjustment through the seasons. The astronomical function calculates sunrise and sunset times based on the Zone 1 latitude setting, which covers the UK and similar northern European latitudes. The 100-hour battery reserve maintains programming and timekeeping during mains power interruptions.\u003c\/p\u003e\n\u003cp\u003eThe mechanical dial face shows a 24-hour scale with red graduations, and the central nut adjusts the timing offset. Three brass terminal clips on the grey metal housing connect to the incoming supply and outgoing load circuit. The clear polycarbonate cover protects the mechanism and allows visual confirmation of the current programme position. The unit measures 104mm × 83mm × 134mm and weighs 425g, making it one of the larger electromechanical timers in the Sangamo range.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Net Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e0.425\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Gross Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e0.469\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Gross Weight (KG)\u003c\/td\u003e\n\u003ctd\u003e0.42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Length (mm)\u003c\/td\u003e\n\u003ctd\u003e104\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Width (mm)\u003c\/td\u003e\n\u003ctd\u003e83\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Height (mm)\u003c\/td\u003e\n\u003ctd\u003e134\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Length (mm)\u003c\/td\u003e\n\u003ctd\u003e104\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Width (mm)\u003c\/td\u003e\n\u003ctd\u003e83\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Height (mm)\u003c\/td\u003e\n\u003ctd\u003e134\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/products_Q553.13.11_datasheet.pdf\" target=\"_blank\"\u003eProduct Specification Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/manual_Q550.pdf\" target=\"_blank\"\u003eProduct Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is an astronomical time switch?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAn astronomical time switch calculates sunrise and sunset times based on latitude and date, then switches circuits on and off relative to those times. This means outdoor lighting automatically adjusts through the year without manual reprogramming as daylight hours change with the seasons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is Zone 1?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eZone 1 refers to a latitude band covering the UK, Ireland and similar northern European locations between approximately 50-58 degrees north. Sangamo astronomical timers are calibrated for specific zones to ensure accurate sunrise\/sunset calculation for the installation location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the early-off function do?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe optional early-off function allows the time switch to turn the circuit off before the calculated sunset time. This is useful for security lighting that only needs to operate during the darkest hours rather than from dusk to dawn, reducing energy consumption.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the 100-hour battery reserve?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe internal battery maintains the time switch's programming and timekeeping for up to 100 hours during mains power cuts. This prevents the programme resetting to factory defaults after brief power interruptions, which would otherwise require reprogramming.\u003c\/p\u003e","brand":"Sangamo","offers":[{"title":"Default Title","offer_id":45294042120459,"sku":"Q553.13.11","price":228.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/Q553.13.11_e7cabdbb-7f13-48c1-9d8e-2e10bbf0cf69.jpg?v=1714667562","url":"https:\/\/niori.co.uk\/products\/sangamo-astro-zone-1-4-pin-time-switch-1-on-off-optional-early-off-20a","provider":"Niori","version":"1.0","type":"link"}