AL Standard Power Supply for Sita 405AL to 412AL & 440AL - up to 40w Lamps - LED Indicator

AL Standard Power Supply: For Sita 405AL to 440AL Systems (up to 40W)

This is the genuine replacement power supply for Sita's AL domestic UV range — 405AL, 412AL and 440AL systems up to 40W — supplied complete with the lamp lead. It uses the standard AL control: a simple green/red LED indicator, with no digital display.

Specifications

Important: check your sleeve bolt design before ordering

Older Sita AL systems have a smooth lamp connection that simply slides on. Newer systems use a locking sleeve bolt design, which this replacement power supply is built for — if your system has the older smooth connection, you'll also need to fit the newer locking sleeve bolt for this power supply to connect correctly. Check your existing connection before ordering, or see our additional product photos for a visual comparison.

Signs you need this part

• Neither LED lights up when the system is powered
• The red fault LED stays lit even after checking the lamp
• The power supply casing is cracked, damaged, or has visible signs of a previous water leak

Why it matters

The power supply is what actually drives the lamp — without it working correctly, your UV system isn't disinfecting your water even if everything else looks fine. Isolate power and water before replacing it, and confirm your sleeve bolt design matches before fitting.

How to fit it

1. Isolate power to the UV system before starting.
2. Confirm your sleeve bolt design matches this power supply (see note above).
3. Disconnect the lamp lead and remove the old power supply.
4. Fit the new power supply and reconnect the lamp lead.
5. Restore power and confirm the green LED lights to show the system is working.