Twin outlet 110V site transformer with 3.3KVA capacity, IP44-rated weatherproof casing and resettable thermal overload protection. Supplied with BS-approved 13A plug. Two 16A sockets for running tools simultaneously on site.
The 3.3KVA dual outlet 110V transformer is a workhorse piece of kit for anyone running power tools on a construction site. It takes your standard 230V mains supply via a BS-approved 13A plug and steps it down to 110V, which is the required standard for site tools across the UK. Two 16A sockets mean you can run a couple of tools at the same time without swapping leads around or carrying two transformers to site.
The casing is a heavy-duty GPR (glass-reinforced polyester) construction, fully weatherproof and rated to IP44. That means it can sit out on a wet slab or in a damp outbuilding without you losing sleep over it. It is not designed for full submersion, but it handles the usual site conditions without complaint. There is a blue LED power indicator on the front so you can tell at a glance whether the unit is live. Simple idea, genuinely useful when you are working in poor light or across a busy site.
Thermal Protection on the 3.3KVA Dual Outlet 110V Transformer
One of the more practical features here is the resettable thermal overload protection. If the unit trips due to overloading or overheating, you do not need a replacement fuse or a call to the hire shop. Press the reset button and you are back up. This happens more often than people expect, particularly when running two heavy-draw tools at the same time.
The continuous rating is 1.8KVA, which covers a single mid-range tool comfortably. The 3.3KVA peak capacity gives you headroom for startup surges when running two tools. Worth bearing that in mind when choosing what you plug in. A large angle grinder and a heavy drill pulling simultaneously will push it harder than two smaller tools.
Priced at under £70, this transformer undercuts most hire costs over a few weeks. If you are on a longer job or buying for regular use, it pays for itself quickly. Supplied ready to use straight out of the box.
Pro Tip: Always uncoil the full cable length before connecting loads, and if you are running two tools simultaneously, check their combined wattage stays within the 1.8KVA continuous rating to avoid nuisance trips from the thermal overload.
Site transformers like this one are used daily by electricians, groundworkers, joiners, general builders and anyone else running 110V power tools on construction sites in the UK. The 110V standard is mandatory on most commercial and civil engineering sites, so having your own transformer avoids relying on site distribution boards that are already overloaded. The dual outlet makes it practical for smaller gangs where two people need power in the same area.
It is equally useful on renovation projects, loft conversions and extensions where a temporary power supply is set up from the house consumer unit. Skip hire yards, workshops and plant storage areas also use these to keep 110V tools powered without dedicated site electrical infrastructure.
Best For
Construction sites requiring 110V tool power
Running two 110V tools simultaneously
Renovation and extension work
Groundworks and civils sites
Electricians and general builders
Compatible With
Standard 230V UK mains supply (13A plug)
110V 16A site tools and equipment
Angle grinders, drills, saws and lights
Standard yellow 110V site leads
Key Specifications
Transformer capacity: 3.3KVA
Continuous rating: 1.8KVA
Output voltage: 110V
Output sockets: 2 x 16A
Input: BS-approved 13A plug (230V)
IP rating: IP44 weatherproof
Thermal overload: resettable
LED power indicator: blue
Not suitable for: Not suitable for powering 230V tools or appliances directly. The continuous 1.8KVA rating means it is not ideal for sustained simultaneous use of two high-draw tools such as large grinders or heavy-duty disc cutters.
Plug the 13A input lead into your mains supply. The blue LED will confirm the unit is live. Connect your 110V site tools to one or both of the 16A output sockets. Check that the combined load of any tools running at the same time does not exceed the 1.8KVA continuous rating for extended use.
If the thermal overload trips, disconnect the tools, allow the unit a few minutes to cool, then press the reset button before reconnecting. Keep the transformer on a flat, stable surface with adequate airflow around it. Do not cover it with materials or stack items on top while in use.
Place the transformer on a flat, stable surface with clear airflow around the casing
Connect the 13A input plug to a suitable 230V mains supply or site distribution outlet
Check the blue LED indicator confirms the unit is powered on
Connect your 110V 16A site tools to one or both output sockets
If running two tools simultaneously, ensure their combined draw stays within the 1.8KVA continuous rating
If the thermal overload trips, disconnect tools, wait a few minutes for the unit to cool, then press the reset button to restore power
Can I run two tools at the same time on this transformer?
Yes, it has two 16A output sockets so two tools can be connected simultaneously. The continuous rating is 1.8KVA though, so keep an eye on the combined load. Two lighter tools such as a drill and a site light will be fine. Two heavy-draw tools running flat out at the same time will push it and may trigger the thermal overload.
What does IP44 mean in practice on site?
IP44 means the casing is protected against solid objects over 1mm and against water splashing from any direction. In plain terms, it handles rain, wet concrete splashes and general damp site conditions without issue. It is not waterproof for puddles or heavy flooding, so keep it off the ground on wet days if you can manage it.
The transformer uses a glass-reinforced polyester (GPR) enclosure rated to IP44, providing solid protection against moisture and site debris without the weight of a metal casing. The core is wound to provide a 3.3KVA peak capacity with a 1.8KVA continuous output rating at 110V centre-tapped to earth (CTE), which is the UK site safety standard. Resettable thermal overload protection is built in, and the unit ships with a BS-approved 13A input plug fitted as standard.
Transformer Capacity
3.3KVA
Continuous Rating
1.8KVA
Input Voltage
230V
Input Connection
BS-approved 13A plug
Output Voltage
110V
Output Sockets
2 x 16A
IP Rating
IP44
Casing Material
GPR (glass-reinforced polyester)
Overload Protection
Resettable thermal overload
Power Indicator
Blue LED
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