When you're choosing a replacement for electrical distribution switchgear protection, the main decision comes down to matching the breaker to the existing slot. Two preowned options are easy to size against your panel: the ABB SACE S3 100A breaker listed at $149.90 and the Square D 12-718012-38 900A 600V 3-pole breaker listed at $799.90. They serve different load levels, so the right pick depends on the amperage and configuration your switchgear actually needs.
Quick Verdict
If your switchgear position is a 100A slot in the ABB SACE S3 family, the ABB SACE S3 100A breaker is the straightforward choice. If you need a heavy 900A, 600V, 3-pole breaker for a compatible Square D switchgear position, the Square D 12-718012-38 is the unit that provides the required capacity. Let your load requirement steer the decision.
At a Glance
| Product | Listed Price | Condition | Max Amperage | Details |
|---|---|---|---|---|
| ABB SACE S3 AG03018959 100A Circuit Breaker | $149.90 | Used | 100 A | SACE S3 model |
| Square D 12-718012-38 900A 600V 3 Pole Circuit Breaker | $799.90 | Used | 900 A | 600V, 3-pole |
Where Each Product Wins
- ABB SACE S3 100A wins for a 100A distribution position. Its SACE S3 molded-case design is made for compatible ABB SACE S3 switchgear, and its 100A rating is enough for branch or feeder protection at that level.
- Square D 12-718012-38 wins for high-capacity distribution. The 900A rating, 600V classification, and 3-pole configuration make it the only one of the two suited to that heavy-duty class of switchgear application.
Product Notes
ABB SACE S3 100A
The ABB SACE S3 AG03018959 is a used molded-case circuit breaker from the ABB SACE S3 series, rated for 100A. It suits the situation where your panel has a 100A feeder or branch position and you want a replacement from the SACE S3 family. Because it is rated at 100A, it cannot handle loads in the 900A class of the Square D unit, so it is only the right pick when the circuit is truly at that lower level. It is also a preowned unit, so some minor cosmetic wear from previous service is possible.
Square D 12-718012-38 900A 600V 3-Pole
The Square D 12-718012-38 is a used heavy-duty 600V 3-pole circuit breaker, listed at 900A. It is the choice for a high-capacity switchgear position where the original breaker is a compatible Square D A 600V 3-pole model, including associations with Square D MHL/MH-series equipment. The limitation is its scale: a 900A, 600V unit is intended for large distribution circuits, so it is oversized for a 100A load. Minor cosmetic wear from previous use is also possible.
Final Choice by Use Case
- Choose the ABB SACE S3 100A when you need a 100A replacement in ABB SACE S3 switchgear. The match on amperage and series is what makes it the practical pick.
- Choose the Square D 12-718012-38 when your distribution switchgear needs a 900A, 600V, 3-pole breaker and the original part is a compatible Square D model. The capacity and pole configuration are what make it suited to that job.
