When the power goes out, an automatic transfer switch is what keeps the backup feed alive without you pulling a lever. These two dual-power switches solve the same problem but take different paths: one aims for low-cost, mid-capacity backup, and the other prioritizes near-instant changeover and a higher current rating. The right pick depends on the loads you feed and how long they can tolerate an interruption.
Quick verdict
If you need backup power to kick in almost instantly and your circuit demands more current, the Automatic Transfer Switch 3P 100A Transfer Switch Dual-Power Transfer Switch is the stronger candidate. The Double Power Switch, Dual Power Automatic Transfer Switch is the straightforward pick for a more modest setup. Match the switch to your load and interruption tolerance.
Comparison table
| Feature | Double Power Switch | 3P 100A ATS |
|---|---|---|
| Listed price | USD 43.96 | USD 53.81 |
| Rated current | 63A | 3P 100A |
| Conversion time | About 2 seconds | Less than 0.1 second |
| Frequency range | 50/60Hz | 50/60Hz |
| Insulation voltage | 690V | 690V AC |
| Surge rating | 6kA | 8KV |
| Mounting | Screw mounting | Wall-mounted |
| Material | Plastic and red copper | Cold-rolled sheet |
Where each product wins
The Double Power Switch is the pick when your loads tolerate a short pause and you like having an English manual on hand. It is the simpler, lower-cost way to add automatic backup to a modest circuit.
The 3P 100A ATS comes into its own when you need more current and a near-instant handoff. It also offers automatic/manual switching, so you can step in and control the feed directly when you want to.
Product notes
Double Power Switch, Dual Power Automatic Transfer Switch
This is the lower-priced dual power switch, designed for installations where a brief handoff is tolerable. It is rated at 63A and switches at a slower pace than its rival, so it handles standard home and light commercial circuits, but the pause during transfer means you should keep sensitive electronics off this path. The listed features include an insulation voltage of 690V and 50/60Hz operation, and the package includes an English manual. The main limitations are the slower changeover and the 63A ceiling; it will not feed a larger sub-panel. If your loads are modest and your budget is the deciding factor, this switch gives you automatic backup without a big outlay.
Automatic Transfer Switch 3P 100A Transfer Switch Dual-Power Transfer Switch
This is the higher-priced three-pole transfer switch, and the extra money buys two things: current headroom and speed. The 100A rating covers heavier loads, while the less-than-0.1-second conversion time keeps backup power close to seamless. It is a wall-mounted unit with a cold-rolled sheet body finished in a plastic spraying process that helps resist rust, making it a strong fit for long-term fixed installations. It also offers automatic/manual switching, which gives you a way to step in and change the feed by hand if you prefer. The tradeoff is the higher price. For a 100A-class circuit or equipment that cannot handle a multi-second drop, this is the switch to choose.
Final choice by use case
If your installation is a modest feed and a brief interruption is acceptable, the Double Power Switch, Dual Power Automatic Transfer Switch is the option that fits. If you need higher current capability and a near-instant changeover, the Automatic Transfer Switch 3P 100A Transfer Switch Dual-Power Transfer Switch is the better match. Match the switch to the current your gear draws and the interruption time it tolerates, and you get the right backup without paying for capability you do not need.
