Siemens / ITE K3B225 Molded Case Circuit Breaker
- 225A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE K3B225 - 225A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy-duty applications, this three-pole 225-amp breaker offers robust overcurrent defense for aging electrical systems. It mounts seamlessly into legacy ITE and Siemens switchboards, eliminating the need for complex retrofits or JXD63B225 upgrade kits. The unit features an interchangeable thermal-magnetic trip mechanism with adjustable instantaneous settings. Rated for 600VAC maximum, it provides a 25kA interrupting capacity at 240V for dependable commercial performance.Specifications
| Brand | Siemens / ITE |
|---|---|
| Series | K |
| Amperage | 225A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 14kA @ 600VAC |
| Frame Type | K |
|---|---|
| Terminal Type | Lugs |
| For Use With | ITE / Siemens Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 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, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip |
Product FAQs
5 answersWhat type of enclosures or panels is the K3B225 compatible with?
The K3B225 is a legacy K-frame breaker designed specifically for older ITE and Siemens panelboards and switchboards. Verify your panel's compatibility with legacy K-frame bolt-on breakers before installation.
What wire sizes and materials are supported by the K3B225 terminals?
The included lugs are rated for both aluminum and copper (Al/Cu) conductors, accepting wire sizes from 4 AWG up to 350 kcmil. Always verify local codes and apply the manufacturer's recommended torque during installation.
How does the thermal-magnetic trip unit operate on the K3B225?
It utilizes a fixed thermal element to provide long-time overload protection, combined with an adjustable magnetic element that allows you to fine-tune the instantaneous short-circuit trip response for your specific application.
Is the K3B225 suitable for 480V systems with high fault currents?
It can be safely used in 480VAC systems where the available fault current does not exceed its 22kAIC rating. For 240VAC systems, it is rated up to 25kAIC, and at 600VAC, it is rated for 14kAIC.
What does the LI trip function code mean for this breaker?
The LI designation indicates that the breaker provides Long-Time (L) protection against sustained overloads and Instantaneous (I) protection for immediate tripping during severe short circuits.
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