Phenolic Motor Protectors Three-Phase
Motor Protectors
KLIXON® three-phase phenolics motor protector consists of a molded phenolic base assembly containing three heaters and a KLIXON® snap-acting thermal disc with three contacts. The KLIXON® disc is the neutral point of the motor. Each heater is in series with one of the phase windings of the motor, as well as with one of the contacts on the thermal disc. When the disc snaps open because of overheating, the neutral of the motor is open circuited, thereby shutting down the motor. Dual voltage motors are protected with a single protector, as shown in the wiring diagrams below.
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Provides protection against overheating from running and stalled rotor conditions, including:
- Single-phasing
- Plugging duty
- Stalling or failure to start
- Heavy overloads
- High ambient
- Ventilation failures
Mounting
The degree of protection obtained depends to a large extent on the protector location and its manner of mounting. The protector should be located in the motor so that it will receive the maximum amount of heating from the windings, not only for running, but also for stalled rotor conditions. The best location depends upon the construction of the motor. The protector could be located in be the air shield, end bell or possibly the stator iron. Preferably, it should be in the discharge unit.