This British Standard specifies the requirements for single and three-pole electromagnetically operated contactors, in the range 25 A to 600 A for use in nominal 28 V d.c. and 115/200 V three-phase 400 Hz a.c. systems in aircraft.
Two environmental classes and two enclosure categories are specified as follows.
Environmental classes
Class 1. Contactors suitable for high altitude and wide temperature conditions.
Class 2. Contactors suitable for lower altitudes and narrower temperature conditions.
Enclosure categories
Category A. Hermetically sealed contactors.
Category B. Non-hermetically sealed contactors.
BS 2G 132:1981 history
0000 BS 2G 132:1981(1999)
1981BS 2G 132:1981 Specification for general requirements for electromagnetically operated contactors for aircraft