Manual call point
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A manual call point, usually referred to as an MCP within the fire protection industry, and as a "break glass" in the UK, is used to allow building occupants to signal that a fire or other emergency exists within the building. They are usually connected to a central fire alarm panel which is in turn connected to an alarm system in the building, and often to a local fire brigade dispatcher as well.
The first MCP (as we know it) arrived in Europe in 1972 and was invented by KAC. [1]
MCP's would historically be printed with FIRE as a title above a glass element, where the element would be glass which would be covered with plastic. This element design would be the old British Standard. The new European Standard EN54 says that the title should be the House Flame symbol, and the glass would appear differently. The glass will still be covered with plastic on the printed side.
Previously, the old British standard did not allow hinged covers and plastic resettable elements. Plastic elements must have the same printing as the EN54 glass.