eBay

The Fuji Electric BU-ESB3100 is a 3-pole, 100 Amp molded case circuit breaker (MCCB) designed for 600 VAC industrial electrical distribution and motor protection systems. Part of the discontinued BU series, it provides reliable protection against both overloads and short circuits through a thermal-magnetic trip mechanism.
Key Technical Specifications
According to documentation from Industrial Parts R Us and IQElectro, the standard specifications for this unit are:
Current Rating: 100 Amps continuous.
Voltage Rating: 600 VAC.
Interrupting Capacity: 14kA at 480V.
Poles: 3-pole configuration for three-phase systems.
Trip Type: Thermal-magnetic.
Frame Size: 100AF.
Mounting: Panel mount design with a thermoplastic enclosure.
Weight: Approximately 4.5 to 6 lbs.
Special Features & Compatibility
Auxiliary Options: Some versions of this breaker are equipped with a WFH auxiliary switch or a shunt trip for remote signaling or control.
Undervoltage Release: Certain configurations include an undervoltage release mechanism rated at 120 VAC, 50/60 Hz to improve operational safety.
Applications: It is primarily used for branch circuit protection in industrial and commercial environments.

Warranty:

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Condition:

* “An item that has been used previously. The item may show some cosmetic wear, but it is fully operational and functions as intended. See the seller’s listing for full details and description of any imperfections.

* Out of his original package.

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