Square D PowerPact J-Frame JJA Series (High Interrupting) Circuit Breakers
The Square D PowerPact JJA series is a high-interrupting J-Frame molded case circuit breaker rated for a 250A frame size and 600VAC operation. The JJA series delivers significantly higher interrupting capacity than the standard JDA — 65kA at 480VAC versus 18kA — making it the correct choice for installations near large transformers or utility service entrances where available fault current is high. JJA breakers use I-Line plug-in mounting and thermal-magnetic LI trip protection. The JJA series is 80% rated for continuous loading and features dual-break rotating contacts that reduce peak let-through current during fault conditions. The AllBreakerSales.com catalog includes the complete JJA lineup from 70A to 250A in 3-pole configurations. Request a written quote to confirm the required catalog number and current availability.
Series Specifications
| Frame | J-Frame — 250A Frame |
|---|---|
| Amperage Range | 70A – 250A |
| Voltage | 600VAC / 250VDC |
| Poles | 3-Pole |
| Interrupting Rating | 100kA @ 240V / 65kA @ 480V / 25kA @ 600V / 20kA @ 250VDC |
| Mounting | I-Line Plug-In |
| Trip Type | Thermal Magnetic |
History and Replacement Context
The Square D PowerPact JJA series was introduced by Schneider Electric as the high-interrupting variant of the J-Frame line. The JJA designation indicates the high-interrupting thermal-magnetic trip unit with I-Line plug-in mounting. The JJA series is specified when the available fault current at the installation point exceeds the standard JDA series 18kA rating at 480VAC.
Typical Applications
- Commercial buildings near large transformers with high available fault current
- Industrial power distribution panels requiring 65kA @ 480V interrupting
- Manufacturing facility main and sub-feeder protection in high-fault environments
- Data center power distribution units (PDUs) with high fault current
- Motor control center (MCC) feeder protection — high fault current locations
- Utility service entrance equipment requiring maximum interrupting capacity
Available Catalog Numbers
- JJA36070 — 70A, 3 pole, 600VAC / 250VDC
- JJA36100 — 100A, 3 pole, 600VAC / 250VDC
- JJA36125 — 125A, 3 pole, 600VAC / 250VDC
- JJA36150 — 150A, 3 pole, 600VAC / 250VDC
- JJA36175 — 175A, 3 pole, 600VAC / 250VDC
- JJA36200 — 200A, 3 pole, 600VAC / 250VDC
- JJA36225 — 225A, 3 pole, 600VAC / 250VDC
- JJA36250 — 250A, 3 pole, 600VAC / 250VDC