Description

The Siemens 5 GMI 350.3000.78 from Siemens is a medium-voltage vacuum circuit breaker designed for dependable protection, control, and switching of power distribution systems in industrial plants, utilities, and commercial facilities. As part of the proven GMI breaker family, this model delivers high interrupting performance, long service life, and reduced maintenance requirements through advanced vacuum interrupter technology.

Rated at 3000A continuous current with a maximum voltage class of approximately 4.76–5 kV, the breaker is capable of handling heavy electrical loads while providing fast and reliable interruption of fault currents. The unit features a draw-out construction that allows easy installation, removal, and maintenance without disturbing primary bus connections, minimizing downtime during servicing operations. Electrically operated mechanisms with 100–140 VDC control voltage support remote operation, automation integration, and precise system coordination.

The robust mechanical design ensures consistent performance under demanding operating conditions, while high short-circuit interrupting capacity enhances system safety and equipment protection. This breaker is commonly used in metal-clad switchgear assemblies, retrofit projects, and modernization programs where reliable medium-voltage protection is critical.

Typical applications include power generation facilities, substations, petrochemical plants, mining operations, manufacturing environments, and large infrastructure installations requiring high-capacity switching and protection solutions.

Package Included
1x Siemens 5 GMI 350.3000.78 High Voltage Air Circuit Breaker
Rated current: 3000A
Voltage class: High Voltage (typically up to 24kV depending on configuration)
Air-insulated interruption mechanism
Integrated protection and control modules (if applicable)
Mounting hardware (if supplied)
User manual / Technical documentation
Manufacturer warranty card (if included)
Original Siemens packaging (if new)