Medium-Voltage Circuit Breakers

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LiveWire Supply specializes in superior quality medium voltage circuit breakers for reliability, protection and advanced performance, whether they are reliable older oil-filled units, more recent air-break models, or medium voltage vacuum circuit breakers. These circuit breakers are rated 1 - 72 kV and can be used indoor or outdoor.

All medium voltage circuit breakers offered, are designed to improve uptime and are tested in accordance with IEEE standards. Each unit is categorized depending on the medium which extinguishes the arc, such as vacuum, air, and SF6.

Vacuum circuit breakers allow centralized control and are rated up to 6,300 A and higher. They are applied for voltages up to about 40,500 V. Vacuum circuit breakers are also known for long-lasting performance between overhaul in comparison with other types of circuit breakers. Air circuit breakers are rated up to 6,300 A and higher. Their trip characteristics are adjustable and can be configured based on the trip thresholds and delays. These breakers provide high functionality and ease of operation, to meet the strictest demands for most applications. SF6 circuit breakers use sulfur hexafluoride gas to extinguish the arc.

Top suppliers include: Square D, GE, Siemens, ABB, Eaton / Cutler-Hammer / Westinghouse, HHI (Hyundai Heavy Industry), S&C Electric Company, Jyoti, BHEL. LiveWire Supply stocks a wide range of these circuit breakers, available nationwide. Whether you need power protection for a utility/power plant, industrial transportation, mining, or marine services, our team has vast experience in supporting new construction, overhaul, maintenance, and emergencies no matter what the challenge.

LiveWire Supply is truly your one stop shop for completing that medium voltage project. Give us a chance to provide you a comprehensive quote on your total medium voltage needs around 3M splicer kits, Arc Flash Personal Protection Equipment (PPE), knit skull caps, tooling, sensors, and transformers.

Count on us and get in touch with our expert team of medium voltage specialists by calling 1-800-390-3299 or email us at