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Siemens / ITE CJ3B125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Siemens / ITE
CJ3B125
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CJ3B125
Quantity
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Siemens / ITE CJ3B125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
A drop-in replacement for aging commercial systems, the Siemens CJ3B125 provides 125A of reliable thermal-magnetic overcurrent protection. This 3-pole, 600VAC molded case circuit breaker features fixed long-time and instantaneous trip functions. The bolt-on design installs into classic ITE and Siemens switchboards, motor control centers, and CDP panelboards, bypassing the need for a CFD63B125 retrofit kit. Boasting a 100kAIC rating at 480VAC, its integral Amp-Trap limiters reduce fault stress.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJ3B125-R |
| Series | CJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 100kA @ 480VAC, 100kA @ 600VAC, 100kA @ 250VDC |
| 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, Fixed 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 panelboards and enclosures are compatible with the CJ3B125?
This bolt-on breaker is designed for use in legacy ITE and Siemens switchboards, motor control centers, and CDP panelboards.
What wire sizes are accepted by the load side lugs on this breaker?
The included lugs accept 4 AWG to 300 kcmil copper wire, or 2 AWG to 300 kcmil aluminum wire.
How does the CJ3B125 achieve its current limiting rating?
This breaker includes a Cordon fuse pac, which provides high interrupting capacity and current limiting protection in a molded case footprint.
Why is this breaker listed as both ITE and Siemens?
Siemens acquired ITE, and many legacy C-frame breakers like the CJ3B125 carry both brand names or transitioned from ITE to Siemens branding over their production life. They are physically and electrically identical.
Does this breaker feature an interchangeable trip unit?
Yes, the CJ3B125 features an interchangeable thermal-magnetic trip unit with fixed long-time and instantaneous (LI) functions.
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