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Eaton / Westinghouse HLB3300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
HLB3300
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
HLB3300
Quantity
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Eaton / Westinghouse HLB3300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial distribution, the Eaton HLB3300 is a 300A, 3-pole molded case circuit breaker from the classic Mark 75 family. It provides reliable thermal-magnetic protection for heavy-duty electrical systems. This L-Frame unit serves as an exact physical and electrical match for legacy Westinghouse panelboards. Using this original-spec breaker eliminates the need for the TAD3 spacer kit required when retrofitting with newer Series C KD3300 models. Rated for 65kAIC at 240V.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | HLB3300-R |
| Series | HLB |
| Amperage | 300A |
| 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 | LB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 1 AWG - 600 kcmil (Al/Cu) or (2) 1 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 600 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 | Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Mark 75 High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
7 answersWhat types of enclosures are compatible with the HLB3300?
The HLB3300 is an L-Frame circuit breaker designed for use in legacy Westinghouse and Eaton Cutler-Hammer panelboards, switchboards, and motor control centers. It is commonly used as a direct replacement in older distribution systems.
What is the difference between the LB3300 and the HLB3300?
Both are 300A, 3-pole L-Frame circuit breakers, but the HLB3300 is part of the Mark 75 family, which features a higher interrupting capacity. The HLB3300 is rated for 35kAIC at 480V, whereas the standard LB3300 has a lower short-circuit rating.
Are Eaton and Westinghouse HLB3300 breakers the same?
Yes. Eaton acquired the electrical distribution business from Westinghouse. An Eaton HLB3300 is the exact same physical and electrical L-Frame breaker as the original Westinghouse HLB3300.
What wire sizes are accepted by the lugs on this breaker?
The standard lugs for the HLB3300 accept either a single 1 AWG to 600 kcmil wire or dual 1 AWG to 250 kcmil wires. The terminals are compatible with both aluminum and copper conductors.
Can the HLB3300 be used in DC applications?
Yes, this thermal-magnetic breaker is rated for use on DC systems up to 250VDC, providing a direct current interrupting rating of 22kAIC.
How is the trip unit configured on the HLB3300?
This breaker features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
What does the Mark 75 designation mean on this breaker?
The Mark 75 label indicates that the breaker is a high-interrupting capacity model. For the HLB3300, this provides a maximum interrupting rating of 65kAIC at 240VAC and 35kAIC at 480VAC.
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