Eaton / Cutler-Hammer HKB3250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Panel Mount
Quantity
Eaton / Cutler-Hammer HKB3250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for robust industrial applications, the Eaton HKB3250 is a 3-pole, 250A molded case circuit breaker. It provides dependable long-time and instantaneous (LI) trip functions for commercial facilities. This K-Frame device installs into Eaton Series C panelboards and compatible switchboards. It is eventually replaced by the newer HKD3250 model. Rated for 65kAIC at 240VAC, it features fixed thermal and adjustable magnetic trip settings. The breaker is HACR rated and includes lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKB3250-R |
| Series | HKB |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Mark 75 Panelboards, Switchboards |
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| 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 | Mark 75, High Interrupting Capacity, HACR Rated, Reverse Feed |
Product FAQs
6 answersWhat panelboards are compatible with the HKB3250 circuit breaker?
This breaker is designed for use in Eaton Series C panelboards, legacy Mark 75 panelboards, and standard switchboards.
Can the Eaton HKB3250 replace an older Westinghouse HKB3250?
Yes. Eaton acquired the Westinghouse distribution equipment line, making the Eaton or Cutler-Hammer HKB3250 a direct replacement for the legacy Westinghouse HKB3250.
What is the difference between the HKB3250 and the standard KB3250?
The HKB3250 is part of the Mark 75 family and features a higher interrupting capacity compared to the standard KB3250 breaker, while sharing the same physical K-frame dimensions.
What wire sizes do the standard lugs on the HKB3250 accept?
The standard lugs accept aluminum or copper wire ranging from 3 AWG to 350 kcmil. When using aluminum conductors, joint compound is required.
How does the trip unit on the HKB3250 operate?
It features a thermal magnetic trip unit with fixed thermal protection for overloads and an adjustable magnetic trip for short circuit protection.
How is the HKB3250 installed in a panelboard?
It is a panel mount, bolt-on circuit breaker. It requires the appropriate mounting hardware specific to your panelboard or switchboard chassis to secure the bus connections.
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