Automatic Transfer Switch ATS 2P

[Size: 2P 220V, Size: 2P 220V]
I use this to improvise an uninterruptible power supply that switches to a battery backup from a low-voltage power supply on utility power. The switch meets all its specification for DIN rail mounting, automatic transfer action, number of poles, and amp capacity. The screw terminals are entirely adequate for the job. I could not follow the logic of when the switch automatically activates. The transfer switch did activate, but not as I expected, when the utility source shut off. Reversing the connections also did not result in the operation I expected. My expectations or understanding are likely at fault, not the device itself.

[Size: 2P 220V, Size: 2P 220V]
This Pjerjzn 2P 63A 220 ATS Volt features the same quality, durable, nylon case build as the other Pjerjzn hardware I have used for other projects. They haven’t let me down so far and there is no indication that they will anytime soon! The terminals are identified and clearly marked, and the openings are large enough for heavier gauge wire. The manual front switch gives you control, and the indicator bars show you the status immediately. It is mounted easily with the included Din rail, and its compact size takes up minimum box space. I will be using it in manual mode along with a small inverter generator to power my propane boiler and well pump in case the grid and my other two backups fail for any reason. Those are two things you cannot be without where I am, as temps and winter wind chills can be -20 or more for several days, and an extended power outage can be seriously bad news!

[Size: 2P 220V]
I am upgrading my generator station. So I got this automatic transfer switch for a backup power project where I wanted a cleaner way to switch between the normal utility source and a secondary power source. For the price, this is a surprisingly useful little device and offers a lot more flexibility than manually moving connections around whenever backup power is needed.The unit feels reasonably solid, and the DIN-rail style design makes it convenient to integrate into an appropriately sized electrical enclosure. I also like that it is available in configurations intended for switching multiple conductors, which can be important depending on how the electrical system and backup source are designed.Once properly installed, the biggest benefit is convenience. When the primary power source is unavailable, the switch can transfer the connected load to the alternate source and then return it when normal power is restored. For a generator, inverter, or other properly configured backup source, that can make a backup-power installation much easier to use.The 63A rating also gives it enough capacity for a variety of applications, although I would definitely recommend sizing the actual connected load conservatively rather than simply assuming everything can be run at the maximum advertised rating.I used this as part of a dedicated backup-power setup rather than trying to transfer an entire house. For applications such as a selected-load subpanel, networking equipment, refrigeration, lighting, cameras, or other important circuits, an automatic transfer arrangement can be very convenient.Installation is where I would emphasize caution. This is not really a plug-and-play product. There are multiple power sources involved, and correct wiring, overcurrent protection, grounding, neutral handling, generator configuration, and conductor sizing all matter. If you're not completely comfortable working with mains-voltage electrical systems, this is something I would have installed by a qualified electrician.Pros:Automatically switches between primary and backup power sources63A rated capacity provides flexibility for larger loadsCompact DIN-rail style designCan eliminate the inconvenience of manually changing power sourcesUseful with properly configured generator or inverter backup systems

[Size: 2P 220V, Size: 2P 220V]
The VerdictIf you need an automatic transfer switch to manage backup generator integration or dual-source power distribution for an auxiliary panel without relay chatter or dangerous source-overlapping, this 63A dual-power selector switch is a stoutly engineered piece of electrical hardware. Excellent terminal block spacing, clean logic response, and heavy-duty contact ratings make it a top-tier asset for reliable off-grid or emergency power setups.Build Quality & Technical SpecsEnclosure & DIN-Rail Mounting: Flame-retardant, high-impact thermoplastic housing engineered for standard modular DIN-rail mounting inside electrical distribution panels or custom sub-enclosures.Current & Voltage Rating: Robust 63-amp switching capacity supporting multi-pole (2P/4P) configurations for handling heavy residential or workshop single-phase and multi-phase AC loads.Switching Mechanism & Response: Rapid electronic solenoid or motorized changeover logic designed to transition between primary (utility) and secondary (generator/inverter) power sources with minimal dropout delay.Terminal Blocks: Oversized tunnel-type screw terminals with high-torque clamping capacity to securely anchor heavy-gauge copper building wire or stranded feeder cables without strand shearing.Real-World Performance & Practical ApplicationInstalling an automatic transfer switch introduces critical safety demands—if contacts weld shut or transition too slowly, you risk feeding back into grid lines or dropping sensitive loads mid-transfer.I tested this dual-power transfer switch integrating a backup inverter generator into a sub-panel layout. The unit monitors input source availability precisely, throwing the mechanical contactors cleanly into position the moment utility power drops out, and switching back seamlessly once grid stability returns. The internal terminals accept thick wire sizes without binding, and the housing stays cool under sustained high-wattage loads.Bang for Your BuckIndustrial brand-name transfer switches often carry massive commercial markups that break the budget for DIY solar sheds, backup outbuildings, or shop installations. This unit delivers commercial-grade current ratings, reliable logic timing, and rugged physical build quality at a very fair price point.Highly Recommended. Stout high-amp contact retention, rapid switching speed, and built for safe, reliable dual-source power management.

[Size: 2P 220V]
This automatic transfer switch is a well built solution for anyone who wants a reliable way to switch between utility power and a backup generator. The automatic and manual operating modes work as expected, and the indicator lights make it easy to see which power source is active. Installation is straightforward thanks to the clearly labeled terminals and DIN rail mounting design, although I recommend having it installed by a qualified electrician. The flame retardant nylon housing feels sturdy and durable, giving confidence that it will hold up well over time. I also like its versatility since it can be used for residential backup systems, small offices, workshops, and other compatible power applications. The built in over voltage and under voltage protection adds an extra level of safety by helping protect connected equipment from unstable power. The overall build quality is impressive, and the compact design saves space inside the electrical panel while still providing dependable performance. Overall, this is a durable, versatile, and easy to install transfer switch that offers excellent value for anyone setting up a dependable backup power system.