Square D HJA Series Circuit Breakers
The Square D HJA series is a PowerPact H-Frame molded case circuit breaker rated for 250A frame size and 600VAC operation. HJA breakers use I-Line plug-in mounting and feature field-interchangeable trip units. Covering 15A to 250A, the HJA is widely used in commercial distribution panels, industrial branch circuits, and motor feeder protection.
Series Specifications
| Frame | H-Frame (PowerPact) — 250A Frame |
|---|---|
| Amperage Range | 15A – 250A |
| Voltage | 600VAC |
| Poles | 2-Pole & 3-Pole |
| Interrupting Rating | 25kA @ 600V / 65kA @ 480V / 100kA @ 240V |
| Mounting | I-Line Plug-In |
| Trip Type | Thermal Magnetic |
History and Replacement Context
The Square D PowerPact H-Frame (HJA series) was introduced as part of the PowerPact product family in the 1990s, replacing the legacy I-Line H-Frame. The PowerPact design features field-interchangeable trip units.
Typical Applications
- Commercial distribution panels
- Industrial branch circuits
- Motor feeder protection
- HVAC equipment protection
- Lighting and appliance panelboards
Available Catalog Numbers
- HJA36020 — 20A, 3 pole, 240/480/600VAC, 250VDC
- HJA36100 — 100A, 3 pole, 240/480/600VAC, 250VDC
- HJA36015 — 15A, 3 pole, 600VAC
- HJA36025 — 25A, 3 pole, 600VAC
- HJA36030 — 30A, 3 pole, 600VAC
- HJA36035 — 35A, 3 pole, 600VAC
- HJA36040 — 40A, 3 pole, 600VAC
- HJA36045 — 45A, 3 pole, 600VAC
- HJA36050 — 50A, 3 pole, 600VAC
- HJA36060 — 60A, 3 pole, 600VAC
- HJA36070 — 70A, 3 pole, 600VAC
- HJA36080 — 80A, 3 pole, 600VAC
- HJA36090 — 90A, 3 pole, 600VAC
- HJA36110 — 110A, 3 pole, 600VAC
- HJA36125 — 125A, 3 pole, 600VAC
- HJA36150 — 150A, 3 pole, 600VAC
- HJA36175 — 175A, 3 pole, 600VAC
- HJA36200 — 200A, 3 pole, 600VAC
- HJA36225 — 225A, 3 pole, 600VAC
- HJA36250 — 250A, 3 pole, 600VAC