Page 456 - Motor_protection_and_control_Manual_motor_starters_ contactors

AF09 ... AF96 contactors

DC circuit switching

General
The arc switching on DC is more difficult than on AC.
– For selecting a contactor it is essential to determine the current, the voltage and the L/R time constant of the controlled load
– For information, typical time constant values are quoted hereafter: non inductive loads such as resistance furnaces (L/R ≈ 1 ms), inductive loads
such as shunt motors (L/R ≈ 2 ms) or series motors (L/R ≈ 7.5 ms)
– The addition of a resistor in parallel with an inductive winding helps in the elimination of the arcs
– All the poles required for breaking must be connected in series between the load and the source polarity not linked to earth (or chassis).
Technical data
– The tables indicate for the standard contactors the Ie max. operating currents depending on: the utilization category (i.e. L/R) DC-1, DC-3, DC-5
as defined in the IEC 60947-4-1 publication, the operating voltage Ue and the pole coupling details.
Ampere values quoted in these tables are valid for a -25…+70 °C temperature close to the contactors, as long as these values do not exceed
the AC-1 Ampere values for the corresponding ambient temperature
– Max. switching frequency: 300 cycles/h.
5
Selection table
Contactor types AF09 AF12 AF16 AF26 AF30 AF38 AF40 AF52 AF65 AF80 AF96
3 or 4-pole 3-pole 4-pole 3-pole 3-pole 4-pole 3-pole 3-pole 3-pole 3-pole 3-pole
Utilization category DC-1, L/R ≤ 1 ms
≤ 72 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
110 V 10 A 15 A 20 A - - - - - - - - - -
220 V - - - - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
110 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
220 V 10 A 15 A 20 A - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
110 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
220 V 25 A 27 A 30 A 45 A 45 A 50 A 50 A 55 A 70 A 100 A 105 A 125 A 130 A
≤ 72 V 25 A - 30 A - 45 A - - 55 A - - - - -
110 V 25 A - 30 A - 45 A - - 55 A - - - - -
220 V 25 A - 30 A - 45 A - - 55 A - - - - -
440 V 10 A - 20 A - - - - - - - - - -
Utilization category DC-3, L/R ≤ 2 ms
≤ 72 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
110 V 6 A 7 A 8 A - - - - - - - - - -
220 V - - - - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
110 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
220 V 6 A 7 A 8 A - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
110 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
220 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
≤ 72 V 25 A - 30 A - - - - - - - - - -
110 V 25 A - 30 A - - - - - - - - - -
220 V 25 A - 30 A - - - - - - - - - -
440 V 6 A - 8 A - - - - - - - - - -

Utilization category DC-5, L/R ≤ 7.5 ms
≤ 72 V 9 A 12 A 16 A 20 A - 25 A 25 A - 70 A 100 A 105 A 125 A 130 A
110 V 4 A 4 A 4 A - - - - - - - - - -
220 V - - - - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
110 V 10 A 15 A 20 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
220 V 4 A 4 A 4 A - - - - - - - - - -
≤ 72 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
110 V 25 A 27 A 30 A 45 A - 50 A 50 A - 70 A 100 A 105 A 125 A 130 A
220 V 9 A 12 A 16 A 20 A - 25 A 25 A - 70 A 100 A 105 A 125 A 130 A
≤ 72 V 25 A - 30 A - - - - - - - - - -
110 V 25 A - 30 A - - - - - - - - - -
220 V 10 A - 20 A - - - - - - - - - -
440 V 4 A - 4 A - - - - - - - - - -
For additional ratings ≥ 440 V, please consult us.
1SBC101911S0201

5/256 | ABB