Will this work with 110v vac run off transformer or will current draw from transformer stop it switching off automatically

The power tool controls the switching of the Vac/Transformer, so I don't see how the transformer will effect switching. The unit does however have a maximum current load limit, for the Vac. In your case Vac/Transformer. This is a maximum load of 1500W. So you must ensure that the current draw of your Vac/Transformer combination does not exceed 1500W.

My table saw is power is controlled by a NVR switch and doesn’t work with this unit?why? & is there a way around this?

The type of switch on your table saw should not matter, once the motor in your table saw is running the iVAC switch will detect the current flow and then turn your extractor on. Try operating your iVAC switch with another power tool(s) to confirm that it is working correctly. IVAC include a troubleshooting guide in the box - this will assist you in diagnosing the problem. NOTE: the iVAC switch will not work with an extractor fitted with an NVR or DOL switch. iVAC offer other products for NVR and DOL protected extractors - the iVAC Pro System.

Under what circumstances would I need to use an earthing connection with this unit ?

The earth terminal on the iVAC Switch Box is for grounding accessories only - e.g. Cyclones, caddies and ducting. This helps to manage static. The iVAC Switch Box itself is earthed through the mains lead and plug. Use of the earth terminal is optional.

I have a 1500W vacuum and an 1800W saw - will this overload the switch?

I use it with a 1800w table saw and a 650w shop vac and have not had any issues. I think it is fused at 13 amps so at 3000w (1800 + 1200) you are right on the border line and may well blow the fuse.

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🛠️ Clean smarter, not harder — never miss a dust-up again!

SAFETY CONVENIENCE - 13A circuit breaker with manual override ensures safe, reliable operation every time.
FLEXIBLE INSTALLATION - Includes 4 fixing tabs and earth terminal for secure wall, bench, or vacuum mounting.
SMART DELAY OVERRUN - 1-second start delay prevents overload; 6-second overrun clears residual dust efficiently.
POWERFUL COMPATIBILITY - Supports vacuums up to 1500W and total load up to 2900W—built for serious workshops.
EFFORTLESS AUTO CONTROL - Automatically powers your vacuum with your tool for seamless dust management.

The iVAC Vacuum Auto Switch Box (13A UK model) intelligently automates your vacuum’s power based on your tool’s activity, supporting up to 1500W vacuum power and 2900W total load. Featuring a 1-second ON delay and 6-second overrun, it optimizes dust collection while protecting your circuit with a resettable 13A breaker. Designed for easy mounting and manual override, it’s the ultimate upgrade for a cleaner, safer workshop environment.

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Manufacturer	iVAC
Part number	SB24013-UK
Item Weight	600 g
Product Dimensions	12.8 x 5.6 x 17.7 cm; 600 g
Manufacturer reference	SB24013-UK
Colour	yellow
Voltage	230 Volts
Wattage	1.5E+3
Amperage Capacity	13 Amps
Maximum power	2900 Watts
Capacity name	combined
Cord length	900 Millimetres
Switch Type	3-way
Plug format	BS1363 13A
Special Features	1 second ON delay, 13A circuit breaker, 6 second over-run, manual ON and OFF override
Included components	Instructions - English, Welsh, Polish. FAQ information
Batteries included?	No
Batteries Required?	No

iVAC Vacuum Auto Switch Box - 13A UK Model, Push Button, ON-OFF, Yellow

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