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Siemens / ITE CJ3B250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Bolt-On
Siemens / ITE
CJ3B250
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CJ3B250
Quantity
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Siemens / ITE CJ3B250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for aging infrastructure, this 250A MCCB utilizes integrally fused Amp-Trap limiters to provide superior current-limiting performance. It installs into legacy ITE and Siemens switchboards or motor control centers. For modern upgrades, it is replaced by the CJD63B250, which requires a retrofit kit for proper installation. Equipped with thermal-magnetic protection, it handles 600VAC systems while maintaining a 100kA short-circuit current rating.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJ3B250-R |
| Series | CJ |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 100kA @ 480VAC, 100kA @ 600VAC, 100kA @ 250VDC |
| Frame Type | CJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | ITE / Siemens Switchboards, Motor Control Centers, CDP Panelboards |
| Wire Gauge | 250 kcmil - 500 kcmil (Cu), 350 kcmil - 500 kcmil (Al) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Amp-Trap Current Limiters |
| Standards | UL 489, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Interchangeable Trip Unit, High Interrupting Capacity |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhich Siemens and ITE distribution equipment accepts the CJ3B250 breaker?
This C-frame bolt-on breaker is specifically designed for integration into legacy ITE and Siemens switchboards, motor control centers (MCCs), and CDP series panelboards.
What wire sizes and materials are supported by the CJ3B250 lugs?
The factory lugs accommodate 250 to 500 kcmil copper (Cu) conductors or 350 to 500 kcmil aluminum (Al) conductors. Always verify that the wire material matches the specific lug rating and apply the manufacturer-specified torque during installation.
How is the trip unit configured on the CJ3B250?
It utilizes a thermal-magnetic trip unit with an LI (Long-Time, Instantaneous) function code. The thermal element is fixed for standard overload protection, while the magnetic instantaneous trip is adjustable, allowing installers to tune the short-circuit response based on specific load or coordination requirements.
Can the CJ3B250 be utilized in DC circuit applications?
Yes, this breaker is fully rated for DC applications up to 250VDC, providing a high interrupting capacity of 100kAIC at that voltage.
What does the current-limiting designation mean for the CJ3B250?
As a current-limiting breaker, it is engineered to clear high-magnitude short circuits extremely fast, typically within a half-cycle. This rapid action significantly reduces the peak let-through current and let-through energy, minimizing thermal and mechanical stress on downstream equipment.
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