Electrical Standards For Contactors AC1, AC2, AC3, AC4, DC1, DC2 DC3

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Electrical Standards For Contactors
Electrical Standards For Contactors

Electrical Standards For Contactors AC1, AC2, AC3, AC4, DC1, DC2 DC3

Electrical Contactors are categorized according to the current making and breaking values for contactors.
This will depend on the following:

  1. The type of load to be controlled (Inductive load, Lighting load, Motor load, Resistive load, Capacitive load)

  2. The operating cycle conditions.

For any applications there are different contactors available depending upon load application which every electrical engineer you must know before designing any systems.

You may have often seen the ratings described on contactor name plate depicting various parameters. One of most important to be considered are as described in this article.

AC duty (Alternating Current) for Contactors:

AC-1

Non-inductive or slightly inductive loads, example: resistive furnaces, heaters

AC-2

Slip-ring motors: switching off

AC-3

Squirrel-cage motors: starting, switches off motors during running time

AC-4

Squirrel-cage motors: starting, plugging, inching

AC-5a

Switching of discharge lamps

AC-5b

Switching of incandescent lamps

AC-6a

Switching of transformers

AC-6b

Switching of capacitor banks

AC-7a

Slightly inductive loads in household appliances: examples: mixers, blenders

AC-7b

Motor-loads for household appliances: examples: fans, central vacuum

AC-8a

Hermetic refrigerant compressor motor control with manual resetting overloads

AC-8b

Hermetic refrigerant compressor motor control with automatic resetting overloads

AC-12

Control of resistive loads and solid state loads with opto-coupler isolation

AC-13

Control of solid state loads with transformer isolation

AC-14

Control of small electromagnetic loads

AC-15

Control of A.C. electromagnetic loads

AC-20

Connecting and disconnecting under no-load conditions

AC-21

Switching of resistive loads, including moderate overloads

AC-22

Switching of mixed resistive and inductive loads, including moderate overloads

AC-23

Switching of motor loads or other highly inductive loads

Direct Current Duties DC1, DC3, DC5:

DC-1

Non Inductive or slightly inductive loads, resistance furnaces, heaters

DC-3

Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors

DC-5

Series-motors, starting, plugging(1), inching(2), dynamic braking of motors

DC-6

Switching of incandescent lamps

DC-12

Control of resistive loads and solid state loads with opto-coupler isolation

DC-13

Control of D.C. electromagnetics

DC-14

Control of D.C. electromagnetic loads having economy resistors in the circuit

DC-20

Connecting and disconnecting under no-load conditions

DC-21

Switching of resistive loads, including moderate overloads

DC-22

Switching of mixed resistive and inductive loads, including moderate overloads (i.e. shunt motors)

DC-23

Switching of highly inductive loads (i.e. series motors)

 

READ HERE  NO-LOAD EQUIVALENT CIRCUIT OF A TRANSFORMER

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