Siemens / ITE KL3B300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE KL3B300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to maintain aging electrical infrastructure, the Siemens KL3B300 is a 300A, 3-pole molded case circuit breaker. It features an interchangeable trip unit with fixed thermal and adjustable magnetic functions. This bolt-on breaker fits legacy ITE enclosures, including CDP-6, CDP-7, FC-I, and SB-1 panelboards. It offers a seamless replacement option without the need for adapter kits used with the JXD63B300. This K-Frame unit delivers a 30kAIC rating at 480VAC and is HACR rated.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | KL3B300-R |
| Series | KL |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Legacy ITE Panelboards (e.g., CDP-6, CDP-7, FC-I, SB-1) |
| Wire Gauge | 1 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 1 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 |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
5 answersWhich panelboards are compatible with the KL3B300 circuit breaker?
This bolt-on breaker is designed for installation in legacy ITE and Siemens panelboards and switchboards, including the CDP-6, CDP-7, FC-I, and SB-1 series.
What wire sizes do the standard lugs on the KL3B300 accept?
The standard mechanical lugs accommodate aluminum or copper conductors ranging from 1 AWG to 500 kcmil. Always verify the specific torque requirements printed on the lug or breaker faceplate during installation to ensure a secure connection.
Can the trip settings on the KL3B300 be adjusted?
The thermal overload protection is fixed at 300 amps, but the magnetic instantaneous trip is adjustable. This allows panel builders and electricians to adjust the short-circuit response to properly coordinate with other protective devices in the electrical system.
Is the KL3B300 suitable for direct current (DC) applications?
Yes, this breaker carries a DC rating of 10kA at 250VDC. When applying a three-pole AC/DC breaker in a DC system, ensure the wiring configuration follows Siemens guidelines for proper pole connections.
Is the KL frame series considered obsolete?
Yes, the KL frame is a legacy product line originally produced by ITE and later Siemens. Sourcing this specific frame allows you to service existing infrastructure without the need for costly panel retrofits or upgrades.
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