ABB Outdoor circuit Breaker Type OHB

OHB medium voltage circuit-breakers for outdoor installation use sulphur hexafluoride gas (SF6) to extinguish the electric arc and as the insulating medium.

Breaking in SF6 gas takes place without current chopping or generation of overvoltages. These characteristics guarantee a long electrical life for the circuit-breaker and limited dynamic, di-electric and thermal stresses on the installation.
The stored energy and free release mechanical operating mechanism allows opening and closing operations through
local and remote control.
The operating mechanism, the activating kinematics of the moving contacts and the anti-condensation heater are located inside a tight metal enclosure which also acts as the support for the poles.
The above-mentioned structure is supported by a frame made of metal sections, to mount the circuit breaker on foundation.
The circuit-breaker is compact and ensures a high level of sturdiness and excellent mechanical reliability.
The enclosure is made out of a steel plate with adequate surface protection by a special metalising and painting
process. The support structures are hot dip galvanised. 

Technical Specification: