Sensata Technologies’s line of automatic and manual reset protectors phenolic protectors are intended for ½ hp to 15 hp general purpose, commercial and industrial motors. These single–phase and three–phase protectors can be used in single and dual voltage type motors.

Overheating of motor insulation causes a reduction in dielectric strength. This can result in motor insulation damage or failure.

Klixon phenolic motor protectors are equipped with a bimetallic snap–acting disc, on which the contacts are mounted, and through which the current flows. If overheating conditions occur, the heating effect of the current flow through the Klixon disc and the influence of motor heat will cause the disc temperature to rise.

When the disc reaches the calibrated setpoint, the Klixon protector automatically opens and shuts down the motor, limiting the winding and shell temperature.

When the motor has cooled to an acceptable operating level — allowing the protector to cool to its reset temperature — the Klixon protector resets automatically to a closed contact position. This allows the motor to restart.

This chart is used to determine protector size needed when making an application. For reference only.

This chart is used to determine the protector size needed when making an application. To be used for reference only.

Maximum Current V=120

Maximum Current V=240

0.75"

High capacity

Low capacity

32

25

0.75"

High capacity

High capacity

50

37

1.00"

Low capacity

Low capacity

40

30

1.00"

High capacity

Low capacity

40

30

1.00"

Low capacity

High capacity

40

30

1.00"

High capacity

High capacity

80

60

1.25"

Standard

Standard

135

100

1.50"

Standard

Standard

175

130