Klixon® motor protection for aircraft prevents hazards beyond the control of the manufacturer — hazards such as sustained overload and excessive temperatures. Since the aircraft motor protector (ACMP) is sensitive to both temperature and current, they inherently protect against a variety of abnormal conditions while allowing maximum motor output before shutdown.

Motor life is extended by limiting the damaging temperatures to a designed level. The ACMP is a bimetallic thermostat with a built–in heating element. It is installed in series with the motor winding. The actuating element is a Klixon ® snap–acting thermal disc. The built–in heaters simulate winding temperatures caused by increases in current.

The ACMP provides crisp, positive switching when the specified trip current is sustained for a specific duration at room temperature. The device will also actuate when an excessive ambient temperature condition occurs, providing protection against overheat conditions other than overload.
Separately, the disc protects against excessive ambient temperature and the heaters protect against excessive current increases (as experienced during locked motor conditions).
Together, the heaters and disc protect against any combination of overload and ambient conditions.

Applications

Inherent protection means that a protector is built into a motor and becomes an integral part of the system. For this reason, Klixon® protectors should only be applied by the motor manufacturer after detailed application tests to determine the heating characteristics of the motor under a full range of load and ambient conditions to verify the selected rating will meet the specific application requirements.