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Siemens / ITE CJ3B150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Siemens / ITE
CJ3B150
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CJ3B150
Quantity
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Siemens / ITE CJ3B150 - 150A 3 Pole Molded Case Circuit Breaker
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Description
Built to handle severe electrical faults, the Siemens CJ3B150 is a 150A, 3-pole current-limiting breaker from the legacy Cordon series. It employs thermal-magnetic trip technology with fixed thermal and adjustable magnetic settings. This bolt-on unit installs into older ITE and Siemens motor control centers, switchboards, and CDP panelboards, eliminating the need for a CFD63B150 retrofit kit. With a 100kAIC rating at 480VAC, its built-in Amp-Trap limiters rapidly clear massive short circuits.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CJ3B150 |
| Series | CJ |
| Amperage | 150A |
| 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
8 answersWhat types of enclosures or panels accept the Siemens CJ3B150?
This bolt-on breaker is designed for use in legacy ITE and Siemens switchboards, motor control centers, and CDP panelboards.
Can I use this breaker in a standard residential load center?
No. The CJ3B150 is a bolt-on molded case circuit breaker intended for commercial and industrial switchboards or CDP panelboards, not standard plug-on residential load centers.
What wire sizes are compatible with the lugs on the CJ3B150?
The included 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.
Is the trip unit on this breaker fully adjustable?
The CJ3B150 features a thermal magnetic trip unit with a fixed thermal setting for long-time protection and an adjustable magnetic setting for instantaneous short-circuit protection.
What does the current limiting designation mean for the CJ3B150?
As a current limiting breaker, it is designed to clear a fault in less than half a cycle. This rapid response reduces the let-through energy, protecting downstream equipment from severe electrical and mechanical stress.
Can this breaker be used in DC applications?
Yes, the CJ3B150 is rated for up to 250VDC with an interrupting capacity of 100kA, making it suitable for specific direct current systems.
Is the CJ3B150 a direct replacement for older ITE breakers?
Yes, Siemens acquired ITE, and this CJ frame breaker serves as a direct replacement for legacy ITE CJ3B150 models used in existing CDP panels and switchboards.
What safety precautions are required when adjusting the magnetic trip setting?
Adjustments should only be made by a qualified electrician while the breaker is de-energized. The settings must align with a proper coordination study to ensure safe and reliable fault clearing.
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