Series 1492 & 1493 are glass break key boxes for accessing operating keys of external command blocks in emergencies.
The key is protected by glass that must be broken using the specific hammer (supplied). The glass breaking is signaled by an internal changeover micro switch. The robust aluminum frame makes this key box suited to any type of indoor environment.
The model 1493-1512 is equipped with an integrated key assembly with dual changeover contact (overall 6 terminals) and three supplied keys (keys are all identical). For the connection a threaded 3/8 gas cableway is available.