Choosing the right breaker for your distribution switchgear
When you need a molded case circuit breaker for electrical distribution switchgear protection, the first question is not just "Square D or GE?" It's about matching the breaker to the panel bus, the load size, and the trip characteristics. The four products here cover 100A to 400A and include two Square D PowerPacT/PowerPact units with I-Line mounting, one Square D PowerPact LJ, and one GE TJ with an adjustable trip. Listed prices range from USD 200.00 to USD 2,450.00, so the choice also depends on whether a hot-spare replacement or a full feeder upgrade matters more.
Quick take
- Need a 100A I-Line breaker for a commercial/industrial panel? The Square D PowerPacT BJA36100 is the starting point.
- Need a 225A industrial breaker with an adjustable magnetic trip? The GE TJ236225 is the only one in this set with that feature.
- Need a 250A I-Line feed? The Square D PowerPact J JJA36250U31X has that ampacity and mounting style.
- Need a 400A main or heavy feeder? The factory-sealed Square D PowerPact LJ LJA36400U31X is the heavy-duty option.
Listed price comparison
The listed price spread is straightforward: USD 200.00 at the low end and USD 2,450.00 at the high end, with two mid-priced options between them.
| Product | Listed Price | Price Bar |
|---|---|---|
| Square D PowerPacT BJA36100 (100A) | USD 200.00 | |
| GE TJ236225 (225A) | USD 749.99 | |
| Square D PowerPact J JJA36250U31X (250A) | USD 1,350.00 | |
| Square D PowerPact LJ LJA36400U31X (400A) | USD 2,450.00 |
Decision matrix
| Use case | Pick | Why it fits |
|---|---|---|
| Low-ampacity I-Line replacement | Square D PowerPacT BJA36100 | 100A, 3-pole, 600V AC, I-Line style, thermal overload protection |
| Adjustable trip for a 225A industrial load | GE TJ236225 | 225A, 3-pole, 600VAC, adjustable magnetic trip, bolt-on industrial style |
| Mid-size I-Line feeder with electronic trip | Square D PowerPact J JJA36250U31X | 3-pole, 600V AC, I-Line connection, electronic trip unit |
| Main or heavy feeder | Square D PowerPact LJ LJA36400U31X | 400A, 3-pole, 3PST configuration, factory-sealed surplus unit |
Product notes
Square D PowerPacT BJA36100 (100A, 3-Pole, 600V AC, I-Line)
If your switchgear uses I-Line mounting and you only need a 100A feed, this PowerPacT breaker is the most direct fit in the lineup. It is specified for commercial and industrial applications, with a 100A continuous rating, 3-pole/600V AC design, and thermal overload protection. The control style is listed as a switch. The main limitation is the small frame: at 100A it will not cover the higher-load circuits that the other three breakers handle, and this listing does not include a factory box.
GE TJ236225 (225A, 3-Pole, 600VAC, Adjustable Trip)
The GE TJ236225 is the only breaker in this group with an adjustable magnetic trip. The listing specifies a 600-2250A adjustable magnetic trip range, so you can tune overcurrent response for the load. It's a 225A, 3-pole, 600VAC unit built for industrial power distribution and described with a bolt-on/industrial style. It is also the only GE product here, and the used-surplus condition is the big limitation: the listing says the unit is untested, with normal cosmetic wear and terminals showing oxidation but no evidence of overheating.
Square D PowerPact J JJA36250U31X (250A, 3-Pole, 600V AC, I-Line)
The JJA36250U31X sits in the middle of the lineup with a 250A, 3-pole, 600V AC rating and an I-Line mounting connection, so it pairs naturally with Square D I-Line panels. The PowerPact J design is described with an electronic trip unit (MicroLogic 3.2), which can be useful for coordinating protection on industrial distribution. It's listed as surplus pre-owned. The main thing to weigh is whether 250A is the right size for your feeder: the breaker sits between the 225A GE and the 400A Square D in this group, so it's a logical pick only when your load needs more than the mid-size option but less than the heavy feeder.
Square D PowerPact LJ LJA36400U31X (400A, 3-Pole)
The 400A PowerPact LJ is the one to look at when you need a main or heavy-feeder breaker. Its 3PST contact configuration and 351-400A current rating put it above the other products in this comparison, and the factory-sealed pre-owned surplus packaging makes it a sealed option. It is listed for industrial applications and designed for switchboards, panelboards, and motor control centers. The trade-off is size: a 400A frame is more than you need if your panel is built around 100-250A feeds.
Final recommendation by use case
If you want a short answer for a specific install:
- For a replacement in a low-ampacity I-Line panel, choose the Square D PowerPacT BJA36100.
- For an adjustable trip in an industrial feed, go with the GE TJ236225.
- For a mid-size I-Line feeder, the Square D PowerPact J JJA36250U31X is the match.
- For a main or heavy feeder, the factory-sealed Square D PowerPact LJ LJA36400U31X is the top pick.
