Eaton / Cutler-Hammer HKB3100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Panel Mount
Quantity
Eaton / Cutler-Hammer HKB3100 - 100A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for commercial and industrial distribution, the Eaton HKB3100 is a 3-pole, 100A molded case circuit breaker from the classic Mark 75 lineup. This K-Frame device provides reliable overcurrent protection for heavy-duty applications, utilizing a standard thermal-magnetic trip unit with long-time and instantaneous (LI) functions. It installs into vintage Eaton Series C panelboards and Westinghouse switchboards. Rated for 65kAIC at 240VAC, it is replaced by the modern HKD3100.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKB3100-R |
| Series | HKB |
| Amperage | 100A |
| 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, Lug Kits |
|---|---|
| Accessories | Load Side 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
7 answersWhat panelboards and switchboards are compatible with the HKB3100?
The HKB3100 is designed to mount in Eaton Series C panelboards, legacy Mark 75 panelboards, and compatible switchboards that accept K-Frame breakers.
How is the magnetic trip adjusted on the HKB3100?
The HKB3100 features a fixed thermal and adjustable magnetic trip unit. The instantaneous magnetic trip can be adjusted using the dials on the front of the breaker, typically allowing settings between 5 and 10 times the continuous ampere rating.
What does the H in the HKB3100 catalog number indicate?
The H indicates that this is a High Interrupting capacity breaker within the Mark 75 family. It offers up to 65kAIC at 240VAC and 25kAIC at 480VAC, providing greater fault protection than standard KB frame breakers.
What wire sizes do the standard lugs on the HKB3100 accept?
The standard lugs for this K-Frame breaker accept wire ranging from 3 AWG to 350 kcmil.
Can the Eaton HKB3100 replace older Westinghouse or Cutler-Hammer models?
Yes. Eaton acquired the Cutler-Hammer and Westinghouse distribution equipment lines. The Eaton HKB3100 is a direct physical and electrical replacement for legacy Westinghouse and Cutler-Hammer HKB3100 breakers.
Is the HKB3100 suitable for DC applications?
Yes, this thermal-magnetic breaker is rated for use in DC systems up to 250VDC, providing a 20kAIC interrupting rating for direct current applications.
What does the LI trip function code mean on the HKB3100?
The LI designation means the breaker provides Long-Time (thermal) and Instantaneous (magnetic) trip functions. The long-time function protects against overloads, while the instantaneous function protects against short circuits.
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