KM3B300 - 300Amp Circuit Breaker
- 300 Amp
- 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
- 3 Pole
Purchase Options:
KM3B300 - 300Amp Circuit Breaker Description
KM3B300 - 300Amp Circuit Breaker
With the KM3B300, the 300-amp rating is only part of what identifies the breaker. Put the KM3B300 specifications alongside the breaker being removed and the equipment requirements, paying attention to the frame, breaker type, pole count, dimensions, amperage, and the AIC rating for your system voltage. When the complete electrical and physical configuration lines up, the KM3B300 may provide the required form, fit, and function for the installation.
Key Features and Benefits
- 300-amp rating for equipment designed around this current rating.
- 3-pole configuration provides a clearly defined characteristic for matching the breaker to the application.
- Type KM4 molded case circuit breaker construction.
- Specified with a Type ET 800 Ampere "KM" Frame, an important detail when identifying the correct breaker configuration.
- 40°C temperature specification gives maintenance personnel another characteristic to compare with existing equipment requirements.
- Well-suited to legacy equipment maintenance when the KM3B300's complete specifications align with the existing system.
Technical Specifications
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Part Number: KM3B300
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Product Type: Molded Case Circuit Breaker
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Type: KM4
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Frame: Type ET 800 Ampere “KM” Frame
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Amperage: 300A
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Poles: 3
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AIC at 600VAC: 22k
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AIC at 480VAC: 30k
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AIC at 240VAC: 42k
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Temperature Specification: 40°C
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Width: 9.00 in.
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Length/Height: 15.50 in.
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Depth: 4.00 in.
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Overall Dimensions: 9.00"W x 15.50"L x 4.00"D
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Approximate Shipping Weight: 40.00 lbs.
Material Compliance and Certifications
No specific certification or material compliance information was provided for the KM3B300, so listings or standards such as UL, RoHS, REACH, or similar designations should not be assumed.
Where It Works Best
The KM3B300 is best suited for existing and legacy electrical systems that require a 300A, 3-pole Type KM4 molded-case circuit breaker with the specified Type ET 800 Ampere "KM" Frame. In these applications, preserving the correct form, fit, and function starts with matching the breaker as a complete component rather than choosing by amperage alone.
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Siemens®, I-T-E®, and Murray® are registered trademarks of Siemens AG. Products sold are surplus, used, or refurbished and are NOT supplied by Siemens AG or its affiliates.
Specifications
- Width:9.0
- Height:15.5
- Depth:4.0
- Poles:3
- Amperes:300
- A.I.C. Rating & Volts:22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
- Type:KM4
- Approx Dimensions:9.00"W x 15.50"L x 4.00"D
- Additional Notes:40°C, Type ET 800 Ampere "KM" Frame, Molded Case Circuit Breaker - discontinued by the Manufacturer
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE ground shipping on breaker orders over $100 and all other items with orders over $500.
Shipping charges are Prepaid and Allowed on UPS Ground orders for all other products on orders over $500.00, again only when shipping within the lower 48 continental United States, provided the product(s) can safely ship UPS Ground.
If the product cannot safely ship via UPS Ground, or is too heavy to ship UPS Ground, then the product will be shipped via freightliner at buyer's expense.
CIRCUIT BREAKER SUPERSTORE® offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).
Same Day Shipping
We strive to ship out your items within one business day.
In rare circumstances, CIRCUIT BREAKER SUPERSTORE® may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.
CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).