BGU is a short name for access control break glass unit. Theses where designed to have a break glass in but the new ones are made of plastic that can be reset as required by the use of a special standard key . These are used to take the access control of a door if there is a reason like a fire in building not to slow people exit from the building . This the fire officers are always pleased to see in place.
They are also useful to have if other emergency services are needed to keep the door open. Haveing the plastic insert is easy to reset as the first ones was glass across the pin and ment that you need to keep glass filaments in stock as well which would always get lost as they are small and thin . its also hard to replace .

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