HMB Operating Mechanism

Hydro-mechanical spring operating mechanisms of type HMB are an ideal partner for the entire portfolio of circuit breakers in high voltage engineering.

Today, they can be found in live tank breakers (LTB), circuit breaker modules (dead tank breakers, DTB), generator circuit breakers (GCB) and gas-insulated switchgear (GIS).

Features and advantages:

• Highest power density in the market
• Modular design
• Easy and fast adaptation on new circuit breaker applications
• Maintenance free
• High operating time consistency
• Long term stability
• Low noise level
• Low reaction forces

Short "time-to-market"
Each of the operating mechanisms of the entire HMB family consists of only a few pre-mounted modules or functional components.

They are combined as a function of the requirements and submitted to the most stringent quality and functional testing prior to their delivery. Owing to the well devised adaptation program, it takes only a few steps and little time to provide the user with a type-tested solution for the circuit breaker and operating mechanism.