Free Delivery on all orders over £99*

Sangamo Q551 Astro Zone 3 Time Switch - 24 Hour 20A 3 Pin

£21299
The RRP is the manufacturer's recommended retail price of the item.
600 In Stock - Ready to Ship
We are an Independent UK Company
Price match. Found it cheaper? Contact us
Trade Discount Available
Description

The Sangamo Q551 is a Zone 3 astro time switch with a circular dial, 24-hour programming, 20A switching capacity and a 3-pin output. The unit automatically adjusts switching times throughout the year based on sunset and sunrise calculations for UK Zone 3 geographical areas, removing the need for manual seasonal reprogramming.

Designed for controlling outdoor lighting, signage and heating systems in commercial and residential installations across central England and Wales (Zone 3 coverage), the Q551 mounts on standard DIN rail or surface-fixes via screw terminals on the rear casing. The 20A rating handles total loads up to 4,600W on 230V mains, allowing control of multiple circuits through a single switch. The optional early-off function allows loads to be switched off before sunset when daylight levels remain adequate.

The 100-hour battery reserve maintains programmed settings and continues switching operations during short-term power outages without requiring reprogramming. The round dial provides a visual reference for current time position and programmed on/off points, marked in red on the white face. The clear polycarbonate cover protects the dial from dust and accidental adjustment once settings are confirmed.

Specification
Product Net Weight (KG) 0.419
Product Gross Weight (KG) 0.463
Outer Gross Weight (KG) 0.42
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 3 coverage?

Zone 3 covers central England and Wales in the UK astro time switch zoning system. The Q551 uses sunrise and sunset times calculated for this geographical area. If your installation is in a different zone, a corresponding Zone 1, 2, 4 or 5 variant is required for accurate seasonal adjustment.

How does the optional early-off function work?

The early-off setting allows the switch to turn off controlled loads before the calculated sunset time, useful when daylight levels remain adequate for longer than astronomical sunset during summer months. This reduces energy consumption while maintaining adequate light levels.

What happens during a power cut?

The 100-hour battery reserve maintains programmed settings and continues switching operations during mains power failure. If power is restored within 100 hours, the switch resumes normal operation without requiring reprogramming.

What is the maximum load?

The 20A rating handles total loads up to 4,600W on 230V mains. For LED lighting this translates to significantly higher fixture counts than with older halogen or incandescent systems due to lower per-fixture wattage.

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.

See it lit, in person

Lighting looks different in a real room. Come and see our range at our showrooms in Birmingham, Hong Kong and Dubai, or talk to our design team wherever you are.

Niori lighting showroom trailer video with closeups of alabaster lighting

Why Niori

Over 20 years lighting homes worldwide

We are a specialist lighting and mirror retailer with showrooms in Birmingham, Hong Kong and Dubai, shipping to customers around the world. Our own design team is here to help, from first idea to final fitting.

Genuine products

An authorised stockist

Every product arrives brand new with the full manufacturer warranty. Found it cheaper elsewhere? Ask us about a price match.

Installation

Fits standard UK back boxes

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

Ordering with us

Free delivery over £99

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.

You Might Also Like

Recommended For You

    Our Reviews

    From first click to final installation, our customers share how Niori lights up their spaces. Read their words and envision what’s possible for yours.

    Featured Projects

    Step into our portfolio and see how we transform homes, restaurants, and commercial spaces and more, worldwide. Click here for a closer look at our latest projects.

    Description

    The Sangamo Q551 is a Zone 3 astro time switch with a circular dial, 24-hour programming, 20A switching capacity and a 3-pin output. The unit automatically adjusts switching times throughout the year based on sunset and sunrise calculations for UK Zone 3 geographical areas, removing the need for manual seasonal reprogramming.

    Designed for controlling outdoor lighting, signage and heating systems in commercial and residential installations across central England and Wales (Zone 3 coverage), the Q551 mounts on standard DIN rail or surface-fixes via screw terminals on the rear casing. The 20A rating handles total loads up to 4,600W on 230V mains, allowing control of multiple circuits through a single switch. The optional early-off function allows loads to be switched off before sunset when daylight levels remain adequate.

    The 100-hour battery reserve maintains programmed settings and continues switching operations during short-term power outages without requiring reprogramming. The round dial provides a visual reference for current time position and programmed on/off points, marked in red on the white face. The clear polycarbonate cover protects the dial from dust and accidental adjustment once settings are confirmed.

    Specification
    Product Net Weight (KG) 0.419
    Product Gross Weight (KG) 0.463
    Outer Gross Weight (KG) 0.42
    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 3 coverage?

    Zone 3 covers central England and Wales in the UK astro time switch zoning system. The Q551 uses sunrise and sunset times calculated for this geographical area. If your installation is in a different zone, a corresponding Zone 1, 2, 4 or 5 variant is required for accurate seasonal adjustment.

    How does the optional early-off function work?

    The early-off setting allows the switch to turn off controlled loads before the calculated sunset time, useful when daylight levels remain adequate for longer than astronomical sunset during summer months. This reduces energy consumption while maintaining adequate light levels.

    What happens during a power cut?

    The 100-hour battery reserve maintains programmed settings and continues switching operations during mains power failure. If power is restored within 100 hours, the switch resumes normal operation without requiring reprogramming.

    What is the maximum load?

    The 20A rating handles total loads up to 4,600W on 230V mains. For LED lighting this translates to significantly higher fixture counts than with older halogen or incandescent systems due to lower per-fixture wattage.

    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.