Vacuum interrupters are used in electrical switchgear. Electrification incorporates an "Electrification Solutions" unit manufacturing low voltage switchgear and motor control centers. Floors may be reinforced to support heavy transformers and switchgear. A circuit breaker (within a switchgear enclosure) is the primary component that interrupts fault currents. A major remaining application is in high voltage switchgear for high-voltage transmission networks. Other common types are oil or vacuum insulated switchgear. Oil insulated switchgear presents an oil spill hazard. These circuits are used for control of switchgear, and for protection of transmission lines. Temperature sensors fitted to cables to the switchgear can permanently monitor temperature build-up. The MA line was a competitor of the ITE "HK" line of horizontal-racking medium-voltage switchgear. The controls also include the switchgear required to control the electric motor. The interior featured a new wrap around style dash with new switchgear, instrumentation and trim. In 1973, HS acquired the industrial electronics firm South Wales Switchgear. Brown interiors got colour-matching switchgear, carpets and trim. Investigations homed in on a newly installed switchgear.