Eaton / Cutler-Hammer KDB3250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Panel Mount
Eaton / Cutler-Hammer
KDB3250
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KDB3250
Quantity
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Eaton / Cutler-Hammer KDB3250 - 250A 3 Pole Molded Case Circuit Breaker
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Description
Designed for commercial and industrial power distribution, the KDB3250 provides non-interchangeable thermal-magnetic trip functionality. Built for Eaton Series C panelboards, switchboards, and motor control centers, it delivers robust fixed thermal and magnetic protection. Rated at 35 kAIC at 480VAC, this three-pole K-Frame unit includes line and load lugs for 250-500 kcmil wire and is HACR rated for HVAC applications.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | KDB3250 |
| Series | KDB |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | 250-500 kcmil (Al/Cu) |
| 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, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs Included (TA350K) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
8 answersWhat frame size and panelboards are compatible with the KDB3250?
The KDB3250 is a K-frame molded case circuit breaker from the Eaton / Cutler-Hammer Series C family. It is designed for use in Series C panelboards, switchboards, and motor control centers.
What are the standard lugs and wire range for this breaker?
The KDB3250 typically uses TA350K line and load lugs. These pressure-type terminals accept a wire range of 250 to 500 kcmil for both aluminum and copper conductors.
Can the thermal-magnetic trip settings be adjusted on the KDB3250?
No, the KDB3250 features a non-interchangeable thermal-magnetic trip unit with fixed long-time and fixed instantaneous (LI) trip functions. The trip curve cannot be adjusted in the field.
How is the KDB3250 applied in DC voltage systems?
The breaker is rated for up to 250VDC with a 10 kAIC interrupting capacity. When used in DC applications, multiple poles may need to be wired in series depending on whether the system is grounded or ungrounded.
How is the KDB3250 mounted?
It is natively a panel-mount, bolt-on circuit breaker. However, it can be converted to a plug-in mounting configuration by installing compatible Eaton Series C plug-in adapter blocks.
What is the difference between the KD3250 and the KDB3250?
Both are 250A, 3-pole, K-frame Series C breakers with identical dimensions and interrupting ratings. The key difference is that the KD3250 has an interchangeable trip unit, while the KDB3250 has a factory-sealed, non-interchangeable trip unit.
Can I field-install internal accessories like a shunt trip in the KDB3250?
No. Because the KDB3250 is a factory-sealed breaker, all internal accessories such as shunt trips, undervoltage releases, or auxiliary switches must be installed at the factory. They cannot be added in the field.
Is the KDB3250 suitable for reverse-feed applications?
Yes. Unlike breakers with interchangeable trip units, the KDB3250 features a factory-sealed, non-interchangeable trip unit, making it UL listed and safe for reverse-feed applications where power is supplied to the load terminals.
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