BRUSH TRUST. WELL EARNED. Fault Thrower 38kV 25kA Single Phase to Earth Fault Making Switch Part of our Horizon family of products, the Fault Thrower provides a means of deliberately introducing a phase to earth fault in order to ensure remote end tripping of a circuit breaker, assuming pilot wires are not available for intertripping. The need to operate the remote circuit breaker can be due to equipment faults, such as thermal protection or low level fault currents that cannot be detected by the remote protection. Key Benefits to Retrofit • Superior, proven technology using a single phase vacuum interrupter driven by a magnetic actuator for fault initiation • The switch is housed in an aluminium tank, dielectric insulation is provided by SF6 gas • Connection to the system is achieved by either a separable connector or open terminal bushing A typical application is with transformer feeders to enable the remote feeder breaker to respond to the transformer local fault detecting relays, such as Buchholz protection, local earth fault protection etc. • Manual release of the switch is available within the control cubicle housed under the tank • The fault is 'thrown' through the aluminium tank, two earth points are provided for safely earthing the equipment steel work and to provide a fault path BRUSH Switchgear Division: Unit 3, Blackwood Business Park, Newport Road, Blackwood, South Wales NP12 2XH United Kingdom T: +44 (0) 1495 223 001