Motor Protection - Siemens SIRIUS 3RW55 Manual

Functions

7.4 Motor protection

7.4 Motor protection
The 3RW55 soft starter has 2 functions for protecting the motor:
● Motor overload protection
● Thermistor motor protection with temperature sensor
Use a combination of both of these functions to implement full motor protection.
NOTICE
Deactivated motor protection can cause material damage.
If the motor is not monitored by a temperature sensor and if the trip class is set to
"CLASS OFF", there will be no motor protection.
Note
Reset after cooling time.
If the 3RW55 soft starter is switched off via a motor protection or intrinsic device protection
tripping operation, the action cannot be acknowledged using the "Reset" function until the
displayed cooling time has expired.
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SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002