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Eaton / Cutler-Hammer HLB3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
HLB3125
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
HLB3125
Quantity
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Eaton / Cutler-Hammer HLB3125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Description
Engineered for commercial and industrial applications, this 125-amp molded case circuit breaker delivers reliable overcurrent protection. It is part of the Mark 75 family and utilizes an L-frame design. The unit installs into legacy Westinghouse panelboards, switchboards, and motor control centers via a standard bolt-on connection. For modern upgrades, this hardware is replaced by the newer HKD3125 model. Rated for 35 kAIC at 480VAC and 25 kAIC at 600VAC, it handles demanding fault currents.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HLB3125-R |
| Series | HLB |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | HLB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | 4 AWG - 4/0 AWG |
| Max Wire | 4/0 AWG |
| 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, Lug Kits, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | IEC 157-1, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
5 answersWhat types of equipment are compatible with the HLB3125 breaker?
This bolt-on breaker is designed for use in legacy Westinghouse panelboards, motor control centers, and switchboards that accept L-frame breakers.
Is the Eaton HLB3125 the same as the Westinghouse or Cutler-Hammer HLB3125?
Yes. Eaton acquired the Westinghouse and Cutler-Hammer distribution equipment lines. An HLB3125 breaker labeled under any of these three brands is the exact same physical and electrical unit.
What does the Mark 75 family designation mean for this breaker?
The Mark 75 designation indicates that this is a high-interrupting capacity breaker. It provides a higher short-circuit rating than standard LB frame breakers, offering up to 65kA at 240VAC and 35kA at 480VAC.
How do I adjust the trip settings on the HLB3125?
This breaker features a fixed thermal and adjustable magnetic trip unit. The instantaneous magnetic trip threshold can be adjusted using the dial located on the front face of the breaker to coordinate with downstream loads.
Can I replace a standard LB3125 with an HLB3125?
Yes. The HLB3125 shares the exact same physical dimensions and mounting footprint as the standard LB3125. Upgrading to the HLB version simply provides a higher short-circuit interrupting rating for your panel.
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