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| ACMP SERIES

Single–Phase and Three–Phase Aircraft Motor Protectors

Introduction

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.

Features

• Single– and three–phase protection

• Locked rotor protection

• Thermal protection

• Neutral tap

• Meets thermal protection requirements of MIL-M-7969, direct acting

PERFORMANCE CHARACTERISTICS

Maximum Current Ratings

28 VDC

120 VAC

SKA

16 amps

16 amps

MKA

50 amps

50 amps

SJE

30 amps

30 amps

MJE

60 amps

60 amps

BJE

120 amps

120 amps

Standard ratings are available in approximately 5% current steps at ultimate trip for motors with maximum allowable temperatures of 120°C, 150°C,

175°C, and 200°C.

Ratings are for device series. Specific devices may vary.