|
Protection of the motor under the following conditions
|
|
|
|
|
|
Using bimetal and thermistor
|
|
Overload in continuous operation
|
|
+
|
|
+
|
|
+
|
|
Extended starting and stopping
|
(+)
|
+
|
+
|
|
Switching to stalled rotor (stator-critical motor)
|
+
|
+
|
+
|
|
Switching on stalled rotor (rotor-critical motor)
|
(+)
|
(+)
|
(+)
|
|
Single-phasing
|
+
|
+
|
+
|
|
Intermittent operation
|
–
|
+
|
+
|
|
Excessive frequency of operation
|
–
|
+
|
+
|
|
Voltage and frequency fluctuations
|
+
|
+
|
+
|
|
Increased coolant temperature
|
–
|
+
|
+
|
|
Impaired cooling
|
–
|
+
|
+
|
