โดย ผศ.ชลชัย ธรรมวิวัฒนุกูร

ตารางที่ 1 การแบ่งระดับของการใช้งานแมกเนติกคอนแทคเตอร์ตามมาตรฐาน IEC 947-4-1

 

Kind of current	Utilization categories	Typical applications
A.C.	AC-1 AC-2 AC-3 AC-4 AC-5a AC-5b AC-6a AC-6b AC-7a3) AC-7b3) AC-8a AC-8b	Non-inductive or slightly inductive loads, resistance furnaces Slip-ring motors: starting, switching off Squirrel-case motors: starting, switching off motors during running 1) Squirrel-cage motors: starting, plugging, inching Switching of electric discharge lamp controls Switching of incandescent lamps Switching of transformers Switching of capacitor banks Slightly inductive loads in household appliances and similar applications Motor-loads for household applications Hermetic refrigerant compressor motor2) control with manual resetting of overload releases Hermetic refrigerant compressor motor2) control with automatic resetting of overload releases
D.C.	DC-1 DC-3 DC-5 DC-6	Non-inductive or slightly inductive loads, resistance furnaces Shunt-motors: starting, plugging, inching Dynamic breaking of d.c. motors Series- motors: starting, plugging, inching Dynamic breaking of d.c. motors Switching of incandescent lamps
1) AC-3 category may be used for occasional inching (jogging) or plugging for limited time periods such as machine set-up; during such limited time periods the number of such operators should not exceed five per minute or more than ten in a 10-min period. 2) Hermetic refrigerant compressor motor is a combination consisting of a compressor and a motor, both of which are enclosed in the same housing with no external shaft or shaft seals, the motor operating in the refrigerant. 3.) For AC-7a and AC-7b,see IEC 1095

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ที่มา : นิตยสาร ไฟฟ้าและอุตสาหกรรม ปีที่ 11 ฉบับที่ 5 กันยายน - ตุลาคม 2547