When you're shopping for electrical distribution switchgear protection, the first decision isn't just trip rating. It's which fault the breaker is designed to interrupt-high current on a 600V distribution line, DC from a solar array, or a ground fault on a 120V piece of equipment. The four breakers here span that range, with the listed price spread from $4.80 to $799.90.
Quick Take
If your circuit is a large three-phase or high-current feed, the Square D 12-718012-38 900A 600V 3-Pole unit is the one with the headroom-it's listed as used, but it is the only 900A/600V 3-pole unit in this group. For solar PV DC circuits, the DC Circuit Breaker 1000V 2-Pole Double MCB is the least expensive option, while the GEYA Solar DC Mini Circuit Breaker 1P MCB offers a PV isolator/disconnect switch configuration for a little more. If you need ground-fault equipment protection at 120V, the Eaton QCGFEP1020 is the dedicated new breaker.
Listed Price Comparison
| Product | Listed Price | Price Bar | Role |
|---|---|---|---|
| Square D 12-718012-38 900A 600V 3 Pole | USD 799.90 | Used 3-pole high-capacity switchgear breaker | |
| DC Circuit Breaker 1000V 2 Pole Double MCB Solar PV | USD 4.80 | 2-pole DC solar PV miniature breaker | |
| GEYA Solar DC Mini Circuit Breaker 1P MCB 6-125A PV Isolator | USD 13.28 | 1-pole solar DC isolator/disconnect | |
| Eaton QCGFEP1020 Ground Fault Equipment Protection | USD 175.00 | New 1-pole 20A ground-fault equipment breaker |
Decision Matrix
| If your priority is... | Unit to consider | Why |
|---|---|---|
| 900A capacity at 600V, three-pole switching | Square D 12-718012-38 | Only 900A/600V/3P unit here, with Square D MPN identification |
| Basic 2-pole DC PV protection | DC Circuit Breaker 1000V 2 Pole | 2-pole DC solar MCB with multiple amp ratings in the title |
| A compact solar PV isolator/disconnect switch | GEYA Solar DC MCB 1P | 1-pole DC MCB with PV isolator role and 6-125A span in title |
| Ground-fault equipment protection at 120V | Eaton QCGFEP1020 | New 1-pole 20A breaker with 30mA ground-fault sensitivity |
Product Notes
Square D 12-718012-38 900A 600V 3 Pole Circuit Breaker
If the circuit is a high-capacity three-pole distribution feed, this Square D unit is the one that belongs in the comparison. The title states 900A, 600V, and 3 poles, and the MPN matches the model number, which makes it straightforward to identify on a switchgear spec sheet. It is listed as used at the highest price in the group. The main limitation is the same used condition: "removed from a working environment" and "may show minor cosmetic wear" appear in the listing, so budget for an inspection before it goes into a critical panel. It is not a new unit, and the price reflects the high capacity rather than a fresh box. Choose it when you need the amperage and pole count, not a budget breaker.
DC Circuit Breaker 1000V 2 Pole Double MCB Solar PV
The strongest reason to choose this one is the price: it's the lowest listed price in the group while still providing a 2-pole DC circuit breaker rated for 1000V. The title lists several amp ratings (10, 16, 20, 32, 40, 50, 63), so you can select the one that matches your solar PV circuit. That makes it an attractive option for combiner boxes or solar panel protection where you want minimal cost. The trade-off is that it's a miniature breaker for DC PV duty, not a high-current switchgear frame. It can't handle the 900A loads the Square D is built for. For a simple, inexpensive solar DC disconnect, this fits.
GEYA Solar DC Mini Circuit Breaker 1P MCB 6-125A PV Isolator Disconnect Switch
Reach for the GEYA when the job is a single-pole solar DC disconnection. The title describes it as both a mini circuit breaker and a PV isolator/disconnect switch, with a 6-125A span and a 1P configuration at a listed price in the middle of the group. Because it is sold as a disconnect switch as well as a breaker, it can serve dual duty at a solar panel or inverter. The limitation is the pole and current type: it's a 1-pole DC breaker for PV, not a 3-pole AC distribution breaker. If your system needs two-pole DC interruption or a high-current 600V AC feed, this unit won't cover it. It's a clean choice for a modest solar PV branch on a tight panel.
Eaton QCGFEP1020 Ground Fault Equipment Protection Circuit Breaker
This one is the specialist. The product name says ground fault equipment protection, and the description adds a 20-amp, 1-pole, 120V rating with 30mA sensitivity and a 10kAIC interrupt rating. That makes it the unit to consider when your need is ground-fault protection on the load side of a 120V circuit, not a main distribution breaker. It's listed as new, which is a solid edge in this group where the high-capacity option is used. The limitation is exactly that specialty: 20A and 120V keep it far below the 900A/600V ceiling of the Square D breaker. If you need to protect a large switchboard feed, this Eaton is the wrong tool; if you need ground-fault equipment protection, it's the one.
Final Recommendation by Use Case
- High-capacity 600V switchgear: Square D 12-718012-38. It's the only 900A 3-pole unit here, and the used condition is the trade-off.
- For solar PV DC circuits where cost matters most: DC Circuit Breaker 1000V 2 Pole. Lowest listed price in the group and 2-pole DC interruption for PV.
- Compact single-pole solar PV disconnect: GEYA Solar DC MCB 1P. Combines MCB and isolator/disconnect in one 1-pole unit.
- Ground-fault equipment protection at 120V: Eaton QCGFEP1020. New 20A 1-pole breaker with 30mA ground-fault sensitivity.
