Eaton / Westinghouse HKA3090 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Quantity
Eaton / Westinghouse HKA3090 - 90A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for legacy systems, the Eaton HKA3090 is a 3-pole, 90A molded case circuit breaker from the Mark 75 family. This K-Frame breaker installs into existing Westinghouse panelboards, switchboards, and motor control centers. It serves as an exact substitute for obsolete units, avoiding the mounting modifications required by the newer JD3090 replacement. Rated at 65kAIC at 240V, it features thermal-magnetic LI protection and an interchangeable trip unit.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | HKA3090 |
| Series | HKA |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | #4 AWG - 350 kcmil |
| Max Wire | 350 kcmil |
| 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, Undervoltage Release, Auxiliary Switch, 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, HACR Rated, Reverse Feed, Trip-Free Mechanism, Quick-Make/Quick-Break |
Product FAQs
6 answersWhat equipment is compatible with the HKA3090 circuit breaker?
This bolt-on K-frame breaker is engineered to fit classic Westinghouse panelboards, switchboards, and motor control centers (MCCs).
Why is the HKA3090 listed under both Eaton and Westinghouse?
Eaton acquired the Westinghouse electrical distribution business in 1994. Legacy Westinghouse frames like the HKA3090 are now supported by Eaton and Cutler-Hammer, maintaining the exact physical footprint and backward compatibility for older panels.
What does the H in the HKA3090 part number indicate?
The H designates a high interrupting capacity version of the standard KA frame. This model provides a 35kAIC rating at 480VAC, which is higher than the standard KA frame rating, allowing it to safely clear larger fault currents.
How does the trip unit on the HKA3090 operate?
It utilizes a thermal magnetic trip mechanism with LI functions. This includes a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit response.
Can I replace an HKA3090 with a modern Eaton Series C breaker?
Eaton Series C K-frame breakers, such as the KD or HKD, serve as modern equivalents. However, mounting a modern Series C breaker into a vintage Westinghouse chassis often requires a specific retrofit hardware kit or bus modification.
What does the Mark 75 family designation mean?
Mark 75 is a legacy Westinghouse trade name for their AB De-ion line of high interrupting capacity molded case circuit breakers. Breakers in this family were engineered to safely clear larger fault currents in industrial applications.
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