In modern-days electrical installations which call for maintenance -free equipment , Vacuum Circuit Breakers (VCBs) and SF6 circuit breakers are being increasingly used VCBs for their minimal maintenance requirements with respect to the switching functions performed and SF6 circuit breakers on account of their immunity to the climatic and environmental conditions . Both of these advantageous features , in addition to compactness , can now be provided in a new generation of compact SF6 gas insulated switchgear based on a hybrid of VCB and SF6 circuit breaker technologies. Such switchgear, using well-proven vacuum interrupter and SF6 gas insulation, are being manufactured by BHEL for medium voltage application at 36KV and 11kV having panels of modular design and entailing minimum day width resulting in efficient utilization of space. It has been successfully tested and certified.