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Sangamo Q551 Round Pattern Astro Zone 4 Time Switch - 3 Pin 20A

£21899
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Sangamo Q551 is a round pattern astro time switch calibrated for Zone 4, delivering automatic dawn-to-dusk switching for exterior lighting, security lighting and commercial perimeter installations. The unit programs 24-hour on/off operations based on calculated sunrise and sunset times for the geographic zone, eliminating manual seasonal adjustment of switching times.

Designed for wall-mounting in plant rooms, service cupboards and consumer units, the time switch operates on 230V mains with a 20A contact rating, handling loads up to 4,600W. The 3-pin terminal configuration accepts live, neutral and load connections, with the round housing fitting standard enclosures used in commercial and light industrial installations. The 100-hour battery reserve maintains programming and real-time clock operation through mains outages without requiring reprogramming.

The white dial face shows 24-hour time markings in red, with brass-finished programming clips that set the on/off switching points by rotating around the dial. The 'Made in UK' marking appears on the face along with the Zone 4 designation, which covers geographic areas requiring specific dawn/dusk calculations. The clear polycarbonate cover protects the dial and clips during operation while allowing visual confirmation of programming status.

Specification
Product Net Weight (KG) 0.427
Product Gross Weight (KG) 0.471
Outer Gross Weight (KG) 0.43
Product Length (mm) 104
Product Width (mm) 83
Product Height (mm) 134
Outer Length (mm) 104
Outer Width (mm) 83
Outer Height (mm) 134
Downloads

Product Specification Sheet

Product Manual

Frequently Asked

What is Zone 4 and does it cover my location?

Zone 4 is a geographic calibration used by Sangamo for calculating sunrise and sunset times. Zone 4 typically covers parts of the UK and northern Europe. Check the product manual or contact us to confirm whether Zone 4 matches your installation location — installing a time switch calibrated for the wrong zone results in switching that occurs too early or too late relative to actual dawn and dusk.

How is the time switch programmed?

Programming uses the brass clips visible on the dial face. Rotate the clips to the desired on/off times on the 24-hour scale. The dial rotates continuously as the internal clock tracks real time, triggering the switching action when the dial position matches a clip position. The product manual includes detailed programming instructions.

What happens during a power cut?

The 100-hour battery reserve maintains the real-time clock and programming through mains outages. When mains power is restored, the time switch resumes normal operation without requiring reprogramming. If the battery depletes during an extended outage, the unit will need to be reprogrammed once mains power returns.

What load can it switch?

The 20A contact rating handles resistive loads up to 4,600W on 230V mains. For inductive loads such as fluorescent ballasts or motor-driven equipment, consult the specification sheet for derated capacity.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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Installation

Fits standard UK back boxes

Designed to fit standard UK back boxes for a straightforward swap of your existing fittings.

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Free delivery on orders over £99, in the UK and worldwide. Easy returns within 14 days, subject to our returns policy. Full manufacturer warranty included.

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    Description

    The Sangamo Q551 is a round pattern astro time switch calibrated for Zone 4, delivering automatic dawn-to-dusk switching for exterior lighting, security lighting and commercial perimeter installations. The unit programs 24-hour on/off operations based on calculated sunrise and sunset times for the geographic zone, eliminating manual seasonal adjustment of switching times.

    Designed for wall-mounting in plant rooms, service cupboards and consumer units, the time switch operates on 230V mains with a 20A contact rating, handling loads up to 4,600W. The 3-pin terminal configuration accepts live, neutral and load connections, with the round housing fitting standard enclosures used in commercial and light industrial installations. The 100-hour battery reserve maintains programming and real-time clock operation through mains outages without requiring reprogramming.

    The white dial face shows 24-hour time markings in red, with brass-finished programming clips that set the on/off switching points by rotating around the dial. The 'Made in UK' marking appears on the face along with the Zone 4 designation, which covers geographic areas requiring specific dawn/dusk calculations. The clear polycarbonate cover protects the dial and clips during operation while allowing visual confirmation of programming status.

    Specification
    Product Net Weight (KG) 0.427
    Product Gross Weight (KG) 0.471
    Outer Gross Weight (KG) 0.43
    Product Length (mm) 104
    Product Width (mm) 83
    Product Height (mm) 134
    Outer Length (mm) 104
    Outer Width (mm) 83
    Outer Height (mm) 134
    Downloads

    Product Specification Sheet

    Product Manual

    Frequently Asked

    What is Zone 4 and does it cover my location?

    Zone 4 is a geographic calibration used by Sangamo for calculating sunrise and sunset times. Zone 4 typically covers parts of the UK and northern Europe. Check the product manual or contact us to confirm whether Zone 4 matches your installation location — installing a time switch calibrated for the wrong zone results in switching that occurs too early or too late relative to actual dawn and dusk.

    How is the time switch programmed?

    Programming uses the brass clips visible on the dial face. Rotate the clips to the desired on/off times on the 24-hour scale. The dial rotates continuously as the internal clock tracks real time, triggering the switching action when the dial position matches a clip position. The product manual includes detailed programming instructions.

    What happens during a power cut?

    The 100-hour battery reserve maintains the real-time clock and programming through mains outages. When mains power is restored, the time switch resumes normal operation without requiring reprogramming. If the battery depletes during an extended outage, the unit will need to be reprogrammed once mains power returns.

    What load can it switch?

    The 20A contact rating handles resistive loads up to 4,600W on 230V mains. For inductive loads such as fluorescent ballasts or motor-driven equipment, consult the specification sheet for derated capacity.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.