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Siemens / ITE CJ3B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Siemens / ITE
CJ3B350
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CJ3B350
Quantity
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Siemens / ITE CJ3B350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
A drop-in replacement for discontinued ITE and Siemens panels, the CJ3B350 restores power without requiring extensive retrofits. This 3-pole, 350A molded case circuit breaker is designed for commercial and industrial switchboards, motor control centers, and CDP panelboards. Featuring integrally fused Amp-Trap limiters, it delivers an exceptional 100kAIC interrupting capacity at 480VAC. The thermal-magnetic trip unit provides reliable long-time and instantaneous protection for critical circuits.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJ3B350-R |
| Series | CJ |
| Amperage | 350A |
| 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 | Lugs Not Included |
| Standards | UL 489, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Integrally Fused, Amp-Trap Limiters |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhich Siemens and ITE enclosures are compatible with the CJ3B350?
This bolt-on breaker is designed for use in legacy ITE and Siemens switchboards, motor control centers, and CDP panelboards.
What are the acceptable wire sizes for the standard lugs on this breaker?
The standard terminals accept 250 to 500 kcmil copper wire, or 350 to 500 kcmil aluminum wire. Ensure proper torque specifications are followed during installation.
Can the trip settings on the CJ3B350 be adjusted in the field?
The thermal element for long-time overload protection is fixed. However, the magnetic instantaneous trip is adjustable, allowing installers to fine-tune short-circuit protection based on the specific load requirements.
Is this molded case circuit breaker suitable for direct current systems?
Yes, it is rated for DC applications up to 250VDC, providing a maximum interrupting capacity of 100kAIC in those environments.
How does the current limiting feature of the CJ frame benefit the electrical system?
As a current limiting breaker, it clears high-level faults extremely fast. This significantly reduces the peak let-through current and energy, which helps protect downstream components from severe mechanical and thermal stress during a short circuit.
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