SMC pneumatic tank SMC pneumatic tank is a new generation of ... spring mechanism of vacuum circuit breaker, FCL by air insulated compartment with the sulfur hexafluoride gas, the ... house The use of environmental conditions a, ambient air temperature: up to 40 ℃, (24h average does not ... than 3000m in coordination with the manufacturer); c, air humidity: daily average relative humidity less than 95%, ...