Short answer: For an AC panel with a generator as backup, choose by current and poles. The GEYA G2R (from $57.27) covers 63 A in 2P or 4P at 110 V or 220 V. The EARU dual power ATS (from $83.93) and the DIN-rail ATS (from $93.94) go up to 100 A, and the DIN-rail ATS is also offered in 3P. For a DC system (12–60 V, for example a battery and an adapter), the Autoro AB18 ($49.82) is the only DC option here. All data below comes from the product listings.
Side-by-side specs
| GEYA G2R | EARU dual power ATS | DIN-rail dual power ATS | Autoro AB18 | |
|---|---|---|---|---|
| Store SKU | ABX-0043 | ABX-0044 | ABX-0046 | ABX-0042 |
| Power type | AC | AC | AC | DC 12–60 V |
| Rated current | 63 A | 100 A | 63 A or 100 A | 18 A max |
| Poles offered | 2P or 4P | 2P or 4P | 2P, 3P or 4P | n/a (DC) |
| Voltage versions | 110 V or 220 V | 110 V or 220 V | 220 VAC | 12–60 VDC |
| Switching | Main (A) has priority; switches to backup (B) in under 50 ms per the listing | Main/standby with automatic and manual operation; versions for grid–generator, grid–PV and grid–grid | Main/backup automatic transfer; arc extinguishing chamber | Main/backup with user-set voltage thresholds; 0 s delay per the listing |
| Display | No | No | No | Yes, real-time voltage |
| Mounting | DIN rail | DIN rail | 35 mm DIN rail | Screw terminals |
| Other listed data | With an inverter as source, the listing asks for a pure sine inverter above 3000 W | Insulation voltage 690 VAC, impulse withstand 8 kV, PC class | No certificate documents included | Over-voltage and reverse-current protection |
| Price (USD) | $57.27–$76.84 | $83.93–$92.35 | $93.94–$102.35 | $49.82 |
Prices as listed on 5 November 2026; the product page always shows the current price for each variant.
Questions and answers
2P, 3P or 4P: which one do I need?
Match the poles to the circuit you switch. A single-phase circuit (line and neutral) uses 2P. A three-phase circuit switched together with the neutral uses 4P, and without the neutral uses 3P. Of these four, only the DIN-rail ATS is offered in 3P.
Can I use these with a generator at a well site or a pump station?
The three AC models are listed for a main supply plus a standby source such as a generator. Size the ATS above the full-load current of the circuit, and check the generator’s output voltage against the version you order (110 V or 220 V).
Can I switch DC battery backup with the AC models?
No. The GEYA, EARU and DIN-rail models are AC devices. For DC systems between 12 and 60 V up to 18 A, use the Autoro AB18.
Are they certified for hazardous areas?
No hazardous-area certificate is included with any of these listings. Install them in a safe-area panel, and confirm any certification your site requires before you order.
Buy
- GEYA G2R mini ATS, 63 A, from $57.27
- EARU dual power ATS, 100 A, from $83.93
- DIN-rail dual power ATS, 2P/3P/4P, from $93.94
- Autoro AB18 DC ATS, 12–60 V, $49.82
Free US shipping on every order. Specs above come from the product listings; if a value you need is not listed, it is not stated by the supplier.