Abstract: The inventive locking-releasing head is designed for pumped powder fire extinguishers which eject a fire extinguishing powder at a positive pressure and can be used as primary fire extinguishing means for fighting fires of class A (solid substances), class B (liquid substances) and class C (gaseous substances), fires of electrical installations when at voltage of up to 1000 V as well as fires at road, railway and river transport. Said locking-releasing head for a powder fire extinguisher comprises a body (1) provided with elements for fixing to the container of said fire extinguisher, a handle connected to the body (1), a locking unit provided with a rod (16) carrying a valve fixed thereto, a control lever (13), a siphon tube (21), a pressure indicator (2) and a spraying nozzle (19). Said pressure indicator (2) is arranged on the valve rod (16) in which rod (16) a hole is provided to communicate the under-membrane cavity of the indicator with the under-valve cavity of the head.