Siemens / ITE CJKL3B125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE CJKL3B125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for industrial applications, the Siemens CJKL3B125 is a 125A, 3-pole current-limiting MCCB protecting 600VAC systems. This legacy bolt-on breaker installs into older ITE and Siemens switchboards. It provides an exact fit for aging panels and is replaced by the CFD63B125 using a retrofit kit. Equipped with thermal-magnetic trip technology, it features integrally fused Amp-Trap limiters to achieve a 100kAIC rating, restricting let-through energy to safeguard equipment.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJKL3B125-R |
| Series | CJKL |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 100kA @ 480VAC, 100kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | ITE / Siemens Switchboards, Motor Control Centers |
| 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 | Load Side Lugs Included, Amp-Trap Current Limiters |
| Standards | UL 489, NEMA AB 1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Integrally Fused, Interchangeable Trip |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhat equipment is the CJKL3B125 compatible with?
This bolt-on breaker is designed for use in legacy ITE and Siemens switchboards, as well as compatible motor control centers. It belongs to the legacy C-Frame group.
What does the Cordon designation mean for this breaker?
The ITE Cordon designation indicates that this is a current limiting circuit breaker. It provides high interrupting capacity, rated up to 100kA at 600VAC, to protect downstream equipment from severe short circuits.
What are the acceptable wire sizes for the lugs on this breaker?
The standard lugs accept 4 AWG to 300 kcmil copper wire, or 2 AWG to 300 kcmil aluminum wire. Ensure proper torque specifications are followed during installation.
How does the trip unit function on the CJKL3B125?
It features a thermal magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal element is fixed, while the magnetic instantaneous trip is adjustable to coordinate with other protective devices.
Is the ITE CJKL3B125 still in active production?
No, this is a legacy molded case circuit breaker originally manufactured by ITE and later Siemens. It is typically sourced as a direct replacement for existing switchboard or motor control center applications.
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