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Functions
7.3 Short-circuit protection function
SIRIUS 3RA6 Compact Starter
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System Manual, 02/2008, GWA 4NEB 560 0601-02 DS 02
7.3 Short-circuit protection function
Function
The SIRIUS 3RA6 compact starter's short-circuit releases are designed to isolate the faulty
load feeder from the supply system in the event of a short circuit in order to prevent any
further damage. The short-circuit release is factory set to 14 times the maximum rated
current I
n
of the compact starter.
The compact starter has a short-circuit switching capacity of 53 kA at a voltage of 400 VAC.
Overload trips and short-circuit trips are signaled via two separate signaling switches so that
both signals can be evaluated in their own right. For additional information on terminal
assignment, please refer to "Connecting the compact starter without optional AS-i mounting
module (Page 75)".
Display concept
The "Short circuit tripped" status is indicated by the following elements:
Table 7-7 Short circuit trip display elements (direct starter/reversing starter)
Actuator Mech. display
RLT 0% Compact starter status
TRIPPED
No display
Short circuit tripped
Resetting the short circuit trip
WARNING
Short-circuit hazard!
If the short circuit trip is reset on the compact starter before the cause of the short circuit
has been eliminated, a new short circuit will occur when the compact starter commences
operation.
Eliminate the cause of the short circuit before resetting the short circuit trip on the compact
starter and putting the compact starter back into operation.
To reset a short circuit trip, turn the actuator to the OFF position.
Function test
To test the short-circuit protection function, press the "TEST I>>" button ("Short-circuit
protection" test button).