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Eaton / Westinghouse HLB3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
HLB3350
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
HLB3350
Quantity
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Eaton / Westinghouse HLB3350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Restoring legacy electrical systems is straightforward with the Eaton HLB3350, a 350A, 3-pole molded case circuit breaker. Belonging to the Mark 75 family, it provides essential long-time and instantaneous protection. This specific model is engineered to mount perfectly into older Westinghouse and Cutler-Hammer panelboards. Choosing this exact replacement prevents the extra labor of installing a TAD3 spacer kit, which is required if using the newer Series C KD3350 cross-reference.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | HLB3350-R |
| Series | HLB |
| Amperage | 350A |
| 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 | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
6 answersWhat is the modern Eaton replacement for the Westinghouse HLB3350?
The current Eaton Series C equivalent is the KD3350. Both breakers share the same physical footprint, but the top terminal tangs on the KD frame sit at a different height. Upgrading to the KD3350 requires a TAD3 spacer kit to fit properly in legacy LB-frame panelboards.
What does the H stand for in the HLB3350 part number?
The H indicates High Interrupting Capacity. As part of the Mark 75 family, the HLB3350 offers higher fault current protection than a standard LB frame, providing 35kAIC at 480VAC and 65kAIC at 240VAC.
What equipment is the HLB3350 designed to fit?
This bolt-on L-frame breaker is engineered for legacy Westinghouse and Cutler-Hammer panelboards, switchboards, and motor control centers. It mounts directly into enclosures designed for Mark 75 or LB-frame breakers without requiring adapter kits.
Can the trip settings on the HLB3350 be adjusted in the field?
The thermal element for long-time overload protection is fixed, but the magnetic instantaneous trip function is adjustable. This allows electricians to fine-tune the short-circuit response based on the specific load requirements.
Does the HLB3350 support parallel conductor installations?
Yes. The standard lugs can accommodate either a single 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors per phase, accepting both aluminum and copper wire.
Is the HLB3350 suitable for DC power systems?
Yes, this thermal-magnetic breaker is rated for use in DC circuits up to 250VDC, where it provides an interrupting capacity of 22kAIC.
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