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Siemens / ITE CJ3B175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Bolt-On
Siemens / ITE
CJ3B175
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CJ3B175
Quantity
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Siemens / ITE CJ3B175 - 175A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial facilities, this 175A molded case circuit breaker utilizes thermal-magnetic trip technology with adjustable magnetic settings. It provides reliable long-time and instantaneous protection. This unit bolts into existing ITE or Siemens motor control centers and switchboards. It serves as a drop-in solution, bypassing the complex retrofit kits required when upgrading to the newer CFD63B175 model. The integrated design achieves a 100kA interrupting rating at 600VAC.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJ3B175 |
| Series | CJ |
| Amperage | 175A |
| 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 | 4 AWG - 300 kcmil (Cu), 2 AWG - 300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| 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, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Interchangeable Trip Unit, High Interrupting Capacity |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
6 answersWhich panelboards and enclosures are compatible with the CJ3B175 breaker?
This bolt-on MCCB is designed for use in legacy ITE and Siemens switchboards, motor control centers, and CDP panelboards. Verify the specific enclosure accepts CJ frame or C-frame breakers before installation.
What wire sizes and materials are supported by the terminals on this breaker?
The standard lugs accept 4 AWG to 300 kcmil copper (Cu) wire, or 2 AWG to 300 kcmil aluminum (Al) wire. Always apply the manufacturer specified torque when terminating conductors to prevent thermal issues.
How does the adjustable magnetic trip function operate on this model?
While the thermal overload protection is fixed at 175 amps, the magnetic instantaneous trip is adjustable. This allows electricians to tune the short-circuit response to accommodate motor inrush currents or coordinate with downstream devices.
Can the CJ3B175 be utilized in direct current (DC) systems?
Yes, this breaker is rated for up to 250VDC with a 100kA interrupting capacity. This makes it suitable for specific DC applications like battery backups or industrial DC drives.
What does the current limiting designation mean for the CJ3B175?
As a current limiting breaker, it is engineered to clear faults rapidly within the first half-cycle. This significantly reduces the peak let-through current and thermal energy, providing enhanced protection for sensitive downstream equipment.
What are the primary safety requirements when installing this bolt-on breaker?
Installation should only be performed by qualified personnel. Ensure the switchboard or CDP panelboard is fully de-energized, follow lockout/tagout procedures, and wear appropriate PPE in accordance with NFPA 70E guidelines.
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