Fault Thrower 38kV 25kA Single Phase to earth fault making switch0 pages

Key Features
» Superior, proven Fit & Forget 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
» Manual release of the switch is available within the control
cubicle housed under the tank
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.
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.
Fault Thrower
38kV 25kA Single Phase to earth fault making switch
» 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
Rated Voltage kV 38
Short Circuit Making Current kA 25
Impulse Voltage Withstand kV 170
Power Frequency Withstand (Wet & Dry) kV 80
Control Voltage V dc 110 (48 & 220 Optional)
Rated Frequency Hz 50/60
Rated 3 sec Short-Time Current kA 25
Peak Short Circuit Making Current kA 63
Peak Withstand Current kA 63
Internal Arc (EATS 41-36) kA 1sec 31.5
Fault Making Time 190ms
Endurance at 25kA 50 makes
Temperature Range ¢ªC -50 to +50
Weight Kg 500
RATINGS
your power in safe hands
HAWKER SIDDELEY SWITCHGEAR