An automatic transfer switch, or ATS, moves your load from one power source to another without anyone flipping a lever, so the lights, the pump or the fridge keep running when KPLC drops. It is the piece that makes a generator, an inverter or solar actually useful in a blackout. This guide explains what an ATS does, how to read the numbers that matter, and which of four models suits a home, a workshop or an off-grid system.
What an ATS actually does
An ATS watches your supply and, when the main source fails, switches the load to a backup source such as a generator, an inverter or solar. When the main supply returns it switches back. You choose the model by the sources it can handle and the current it can carry.
Two numbers then decide how well it works for you, and the first is how fast it changes over.
Transfer time: the number that matters
Transfer time is how long the load is without power during the switch. The Moes Katko 11kW switches in 16 milliseconds or less, the Tomzn TOQ7-100 in under 50 milliseconds, and the TOMZN 63A to 125A and the TOQ3-125 in under 4 seconds. A faster changeover suits equipment that dislikes a gap, while 4 seconds is usually fine for lights and pumps.
For solar and battery systems: Moes Katko 11kW
The Moes Katko watches your solar battery voltage and switches to KPLC when it drops too low, then back to solar once it recovers. It suits 12V, 24V and 48V DC systems, is rated 50A single-phase, has an LCD status display, and handles solar, grid and battery or UPS inputs. That makes it the choice where protecting the battery from running flat matters more than simply detecting a blackout.
For three-phase and workshops: Tomzn TOQ7-100
The TOQ7-100 is a 100A switch for three-phase power. It switches all 3 phases plus neutral between your generator and KPLC in under 50 milliseconds, with an automatic or manual mode, for workshops and small industry.
For homes, pumps and offices: TOQ3-125
The TOMZN TOQ3-125 is a 125A, 4-pole switch for grid, generator and inverter supply. It is rated for 230V single-phase and 400V three-phase systems, with copper contacts and LED source indicators, so it suits homes, water pumps and office buildings.
| Feature | TOMZN Automatic Transfer Switch | Tomzn TOQ7-100 4P 100A 3-Phase ATS | TOMZN TOQ3-125 125 Amp Automatic Transfer Switch | Moes Katko 11KW ATS |
|---|---|---|---|---|
| Product | ||||
| Price | KSh 4,800 | KSh 6,000 | KSh 7,800 | KSh 17,500 Sold out |
| Rated Current (A) | 63 | 100 | 125 | 50 |
| Switching Time | Under 4 seconds | <50ms | Under 4 seconds | ≤16ms |
| Input Sources | Solar, Generator, Grid | Generator, Grid | Generator, Grid | Solar, Grid, Battery/UPS |
| Phases | 2P | 4P | 4P | 1P (Single-phase) |
| Suits | Homes and businesses needing seamless backup power switching between solar, generator and grid | Workshops or small factories running 3-phase machinery that needs to keep running through a grid outage | Homes, water pumps, or office buildings running on either single or three-phase supply | Off-grid and hybrid solar setups where protecting the battery from running flat matters more than just… |
| Link | View & Buy | View & Buy | View & Buy | View & Buy |
Sizing: amps, phase and source
- Amps: choose a rating above the largest load you will run.
- Phase: single-phase or three-phase, matched to your supply.
- Sources: solar, generator, grid, inverter or battery, as your setup needs.
Choosing quickly
For a hybrid solar system, take the Moes Katko. For a workshop on three-phase, the TOQ7-100. For a home or office that can use a 4-second changeover, the TOMZN range fits.
Match the sources and amps to your installation, then open the card to check current price and stock.
Check the TOMZN ATSKSh 4,800 · In stock
Where you would use it
- Home backup Lights and the fridge come back on by themselves when KPLC drops and a generator or inverter takes over.
- Solar and grid A hybrid system switches to KPLC before the battery runs flat, then back to solar.
- Workshops Three-phase machinery keeps running through a grid outage on a generator.
Frequently asked questions
It moves your load between supplies such as KPLC, a generator, an inverter or solar without anyone operating a switch.
The Moes Katko 11kW switches in 16 milliseconds or less, ahead of under 50 milliseconds for the TOQ7-100 and under 4 seconds for the TOMZN and TOQ3-125.
The Moes Katko 11kW. It watches the battery voltage and switches to KPLC when it drops too low, for 12V, 24V and 48V DC systems.
Yes. The TOQ7-100 and the TOQ3-125 are 4-pole switches for three-phase supply.
