Square D - JJA36250U44X 250A 3-Pole 600V I-Line Solid State Circuit Breaker
Square D - JJA36250U44X 250A 3-Pole 600V I-Line Solid State Circuit Breaker
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The Square D JJA36250U44X is a 3-pole, 250-amp solid-state molded case circuit breaker (MCCB) rated for 600VAC with I-Line plug-in mounting. Manufactured by Schneider Electric, the JJ-frame solid-state trip unit delivers precise, adjustable overcurrent protection for large industrial feeder circuits. Engineered for high-performance three-phase systems where accurate trip coordination and fault current management are critical.
Specifications
| Attribute | Value |
|---|---|
| Part Number | JJA36250U44X |
| Manufacturer | Square D / Schneider Electric |
| Amperage Rating | 250A |
| Voltage Rating | 600VAC |
| Number of Poles | 3 |
| Trip Type | Solid State (Electronic) |
| Mount Type | I-Line Plug-In |
| Interrupting Rating | 65kA @ 600V |
| Standard | UL 489 Listed |
| Frame Series | JJ |
Key Features
- Solid-state electronic trip unit with adjustable long-time, short-time, and instantaneous settings
- I-Line plug-in mounting for quick installation in compatible Square D switchboards
- 250-amp capacity for medium-to-large industrial feeder circuits
- 3-pole configuration for three-phase 600V power systems
- High 65kA interrupting rating at 600V
- UL 489 Listed for NEC compliance
Common Applications
- Industrial feeder circuit protection in switchboards and MCCs
- Large motor control center (MCC) incoming feeds
- Manufacturing facility sub-panel main protection
- Data center and critical infrastructure power distribution
- Process control and heavy industrial equipment
Frequently Asked Questions
What is the Square D JJA36250U44X?
The JJA36250U44X is a 250-amp, 3-pole, 600V solid-state I-Line plug-in MCCB from Square D used to protect large feeder and branch circuits in three-phase industrial and commercial electrical distribution systems.
How does the solid-state trip unit differ from thermal magnetic on the JJA36250U44X?
Unlike a fixed thermal magnetic trip, the solid-state electronic trip unit on the JJA36250U44X allows engineers to adjust long-time delay, short-time pickup, and instantaneous trip thresholds, enabling precise system coordination and reducing nuisance tripping.
What is the interrupting capacity of the JJA36250U44X?
The JJA36250U44X is rated at 65kA interrupting capacity at 600V, qualifying it for use in high fault-current industrial environments where large available short-circuit current is present.