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Eaton / Cutler-Hammer KS320300D Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Eaton / Cutler-Hammer
KS320300D
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KS320300D
Quantity
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Eaton / Cutler-Hammer KS320300D - 300A 3 Pole Molded Case Circuit Breaker
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Description
Part of the Eaton Series C family, the KS320300D is a K-frame, 3-pole, 300-amp molded case circuit breaker designed for commercial and industrial power distribution. It provides robust long-time and instantaneous (LI) protection for demanding electrical systems. This unit mount breaker installs into Eaton Series C panelboards, switchboards, and motor control centers. Rated at 65 kAIC at 240VAC, it features a non-interchangeable thermal-magnetic trip unit and includes line and load lugs.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | KS320300D |
| Series | KS |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 250-500 kcmil |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| 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 | HACR Rated, Non-Interchangeable Trip |
Product FAQs
4 answersCan the KS320300D replace older Westinghouse K-frame breakers?
Yes, Eaton Series C K-frame breakers are the direct manufacturer-supported replacements for obsolete Westinghouse and Cutler-Hammer K-frame models, such as the KA, KB, or KD series. When installing in vintage CDP panelboards, a specific retrofit mounting kit may be required to adapt the bus connections.
Which panelboards accept the KS320300D circuit breaker?
This K-frame breaker is designed to mount in Eaton Series C panelboards, switchboards, and motor control centers. It is a unit-mount breaker, meaning it bolts directly to the chassis or mounting pan rather than plugging onto a busbar.
How is the short-circuit protection adjusted on the KS320300D?
This breaker features a thermal-magnetic trip unit with an adjustable magnetic setting. You can modify the instantaneous short-circuit trip threshold using the adjustment dial located directly on the front of the breaker to suit your specific load characteristics.
What does the LI trip function code mean on this breaker?
The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) protection for continuous overloads and Instantaneous (I) protection for short circuits. The thermal element is fixed, while the magnetic element is adjustable.
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