The Interrupters under the moniker Aimee Interrupter. Vacuum interrupters are used in electrical switchgear. Vacuum interrupters can be used for circuit-breakers and load switches. More recently, vacuum interrupters for power switchgear are made with ceramic envelopes. Power fault circuit interrupters are designed to prevent fires from low voltage across loads. The largest coils used either electrolytic or mercury turbine interrupters. Sub-assemblies of vacuum interrupters were initially assembled and brazed together in a hydrogen atmosphere furnace. Some old doorbells, for example, the Soviet ZM-1U4, use mercury switches as current interrupters. Vacuum interrupters may be classified by enclosure type, by application, and by voltage class. GK/RT0011 specifies the requirements for the provision of track circuit interrupters. The early coils had hand cranked interrupters, invented by Callan and Antoine Philibert Masson (1837). Experimental, radio-frequency, and early power-switching vacuum interrupters had glass enclosures. That led to the four forming The Interrupters. Kottage has since toured as a featured musician with The Interrupters. Due to their manufacturing process, vacuum interrupters are proved to be "sealed for lifetime".