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Eaton / Westinghouse JK3175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- Unit Mount
Eaton / Westinghouse
JK3175
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
JK3175
Quantity
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Eaton / Westinghouse JK3175 - 175A 3 Pole Molded Case Circuit Breaker
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Description
Delivering 175 amps of reliable power distribution, this Eaton Series C molded case circuit breaker is built for commercial applications. The 3-pole J-Frame device utilizes thermal-magnetic technology to safeguard circuits against overloads. Designed specifically for legacy infrastructure, it mounts into Westinghouse panelboards and motor control centers. Facility managers can use it to replace hard-to-find JDB3175 or HJD3175 components. It offers a 65kAIC rating at 240V and is HACR rated.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | JK3175-R |
| Series | JK |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 30kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers, Eaton Series C Panelboards |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| 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, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity |
Product FAQs
7 answersWhich panelboards and enclosures are compatible with the JK3175 breaker?
The JK3175 is designed for use in legacy Westinghouse and current Eaton Series C panelboards, switchboards, and motor control centers that accept J-frame unit mount breakers.
What is the physical frame size of the JK3175?
The JK3175 is built on the Eaton Series C J-frame platform. All J-frame breakers share identical physical dimensions, allowing for easy interchangeability within compatible enclosures regardless of the specific ampere rating.
What is the adjustable magnetic trip range for the 175A JK3175 breaker?
The instantaneous magnetic trip on Eaton Series C J-frame breakers is adjustable from 5 to 10 times the continuous current rating. For this 175A breaker, the short-circuit trip range can be set between 875A and 1750A.
What protection does the LI thermal-magnetic trip unit provide?
The LI designation indicates that the breaker provides Long-Time (L) thermal protection against sustained overloads and Instantaneous (I) magnetic protection against short circuits. The thermal element is fixed at 175A, while the magnetic element is adjustable.
Can the modern JD3175 be used to replace a legacy JK3175?
Yes. The Eaton JD3175 is the current Series C replacement for the legacy Westinghouse JK3175. Both share the exact same J-frame mounting footprint and dimensions, though the JD3175 features a slightly higher interrupting rating of 35kA at 480V compared to the 30kA rating of the JK3175.
What wire sizes are accepted by the standard lugs on the JK3175?
The standard load side lugs accommodate 4 AWG to 350 kcmil aluminum or copper conductors. Ensure all connections are tightened to the torque specifications listed on the breaker faceplate before energizing.
Can I field-install internal accessories like shunt trips or auxiliary switches in the JK3175?
Yes. Because the JK3175 is not a factory-sealed breaker, it can accept standard Eaton Series C J-frame field-installable internal accessories. This includes shunt trips, auxiliary switches, and undervoltage releases.
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