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Müller SC28.21 Pro4 2 Channel DIN Rail Time Switch - Bluetooth Programmable

£13199
The RRP is the manufacturer's recommended retail price of the item.
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Description

The Müller SC28.21 Pro4 is a 2-channel DIN rail time switch with Bluetooth programming via iOS and Android smartphones. Each channel switches up to 16A at 230V AC, providing independent control for two separate circuits from a single DIN rail module. The switch uses zero-crossing technology to reduce electrical noise and extend the life of connected LED loads up to 600W per channel.

Designed for distribution boards in residential, commercial and light industrial installations, the SC28.21 Pro4 controls lighting, heating, pumps, ventilation and appliances on daily or weekly schedules without requiring a fixed central controller. The Bluetooth connection allows programming from the Müller app without opening the distribution board enclosure, and the switch retains its program during mains power loss with a 10-year battery reserve.

The module occupies 2 DIN rail spaces (36mm width) and measures 108mm height by 65mm depth, fitting standard UK consumer units and distribution boards. The LCD display shows the current time, next switching event and channel status at a glance. The orange catch at the base indicates Bluetooth connectivity and the unit carries the Made in Germany mark with model number SC28.21 Pro4 on the front face.

Specification
Product Net Weight (KG) 0.16
Product Gross Weight (KG) 0.18
Outer Gross Weight (KG) 0.18
Product Length (mm) 41
Product Width (mm) 108
Product Height (mm) 65
Outer Length (mm) 41
Outer Width (mm) 108
Outer Height (mm) 65
Downloads

Product Specification Sheet

Product Manual

Frequently Asked

How is the time switch programmed?

The SC28.21 Pro4 is programmed via Bluetooth using the Müller app available for iOS and Android. The app connects to the switch when you are within range of the distribution board, allowing you to set daily or weekly on/off schedules for each channel without opening the enclosure or touching the unit.

How many DIN rail spaces does it occupy?

The module occupies 2 standard DIN rail spaces (36mm width). It fits standard UK consumer units and distribution boards with 35mm DIN rail mounting.

What happens during a power cut?

The SC28.21 Pro4 has a 10-year battery reserve that maintains the clock and stored programs during mains power loss. When mains power returns, the switch resumes normal operation without needing to be reprogrammed.

What loads can each channel control?

Each channel is rated at 16A on 230V AC mains, handling resistive loads like heating and incandescent lighting up to 3,680W. For LED loads, the zero-crossing switching supports up to 600W per channel. Inductive loads such as motors may require derating.

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. Refunds are made in line with our returns policy, which has the full details.

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

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    Description

    The Müller SC28.21 Pro4 is a 2-channel DIN rail time switch with Bluetooth programming via iOS and Android smartphones. Each channel switches up to 16A at 230V AC, providing independent control for two separate circuits from a single DIN rail module. The switch uses zero-crossing technology to reduce electrical noise and extend the life of connected LED loads up to 600W per channel.

    Designed for distribution boards in residential, commercial and light industrial installations, the SC28.21 Pro4 controls lighting, heating, pumps, ventilation and appliances on daily or weekly schedules without requiring a fixed central controller. The Bluetooth connection allows programming from the Müller app without opening the distribution board enclosure, and the switch retains its program during mains power loss with a 10-year battery reserve.

    The module occupies 2 DIN rail spaces (36mm width) and measures 108mm height by 65mm depth, fitting standard UK consumer units and distribution boards. The LCD display shows the current time, next switching event and channel status at a glance. The orange catch at the base indicates Bluetooth connectivity and the unit carries the Made in Germany mark with model number SC28.21 Pro4 on the front face.

    Specification
    Product Net Weight (KG) 0.16
    Product Gross Weight (KG) 0.18
    Outer Gross Weight (KG) 0.18
    Product Length (mm) 41
    Product Width (mm) 108
    Product Height (mm) 65
    Outer Length (mm) 41
    Outer Width (mm) 108
    Outer Height (mm) 65
    Downloads

    Product Specification Sheet

    Product Manual

    Frequently Asked

    How is the time switch programmed?

    The SC28.21 Pro4 is programmed via Bluetooth using the Müller app available for iOS and Android. The app connects to the switch when you are within range of the distribution board, allowing you to set daily or weekly on/off schedules for each channel without opening the enclosure or touching the unit.

    How many DIN rail spaces does it occupy?

    The module occupies 2 standard DIN rail spaces (36mm width). It fits standard UK consumer units and distribution boards with 35mm DIN rail mounting.

    What happens during a power cut?

    The SC28.21 Pro4 has a 10-year battery reserve that maintains the clock and stored programs during mains power loss. When mains power returns, the switch resumes normal operation without needing to be reprogrammed.

    What loads can each channel control?

    Each channel is rated at 16A on 230V AC mains, handling resistive loads like heating and incandescent lighting up to 3,680W. For LED loads, the zero-crossing switching supports up to 600W per channel. Inductive loads such as motors may require derating.

    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. Refunds are made in line with our returns policy, which has the full details.

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