Eaton / Westinghouse KL3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Panel Mount
Eaton / Westinghouse
KL3125
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
KL3125
Quantity
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Eaton / Westinghouse KL3125 - 125A 3 Pole Molded Case Circuit Breaker
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125A 3 Pole Molded Case Circuit Breaker
125A 3 Pole Molded Case Circuit Breaker
Description
The Eaton KL3125 is a 3-pole, 125A molded case circuit breaker for industrial facilities, serving as an exact match for aging K-frame infrastructure. It mounts into legacy Westinghouse Pow-R-Line panelboards and MCCs. It crosses to the modern Series C KD3125, ensuring a proper fit without retrofit adapters. Featuring fixed thermal-magnetic trip elements, it provides standard LI protection. Rated for 22kAIC at 480VAC, it reliably restores older electrical systems.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Series | KL |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Pow-R-Line Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 3 AWG - 350 kcmil |
| Max Wire | 350 kcmil |
| Min Wire | 3 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 | Load Side Lugs Included, Current Limiters |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhich panelboards are compatible with the KL3125?
This K-frame breaker is designed for use in Westinghouse Pow-R-Line panelboards, switchboards, and motor control centers. It serves as a direct drop-in replacement for aging infrastructure.
Is there a modern equivalent to the legacy KL3125?
Yes, the modern Eaton Series C KD3125 serves as a direct cross-reference. It shares the same K-frame footprint and mounting configuration, allowing for seamless integration without retrofit kits.
Do I need to purchase separate lugs for the KL3125?
The breaker comes standard with lugs that accept wire gauges from 3 AWG to 350 kcmil. If your application requires different terminations, specialized lugs must be sourced separately.
Is the trip unit on the KL3125 adjustable?
No, the KL3125 features a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous (LI) protection, but the trip thresholds cannot be adjusted in the field.
Can this breaker be DIN rail mounted?
No, the KL3125 requires a bolt-on connection. It must be bolted directly to the busbars of a compatible panelboard or switchboard and is not designed for DIN rail or plug-on applications.
What are the primary safety steps for installing a bolt-on K-frame breaker?
Installation must be performed by a qualified electrician. The main power to the panelboard or switchboard must be completely de-energized and verified with a voltage meter before bolting the breaker to the busbars.
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