Page 507 - Motor_protection_and_control_Manual_motor_starters_ contactors

Three-phase transformer switching

Contactor selection
AC-6a Utilization category according to IEC 60947-4-1

General
Switching the primary of 3-phase transformers, on energization of the transformer, is characterized by high current peaks due to the
magnetization phenomena.

Selection Table
The tables below show the operational ratings for:
– current peaks up to 20 to 30 times the transformer nominal current
– maximum switching frequency of 60 operating cycles per hour
– air ambient temperature ≤ 40 °C.
AC / DC operated contactors AF09 AF12 AF16 AF26 AF30 AF38 AF40 AF52 AF65 AF80 AF96
Operational power at Ue: 50/60 Hz - according to AC-6a
220 / 240 V kVA 4 5 6 10 13 14 15 19 21 23 25
380 / 400 V kVA 7 8 10 17 22 25 26 33 36 39 44 5
415 / 440 V kVA 8 9 11 18 24 27 28.5 36 40 43 48
500 V kVA 9 11 13 22 28 32 34.5 43 48 52 57
660 / 690 V kVA 12.5 14 18 29 37 43 45.5 57 64 68 75
Max. permissible Îpeak A 350 400 500 800 1000 1200 1250 1550 1750 1900 2100

AC / DC operated contactors AF116 AF140 AF190 AF205 AF265 AF305 AF370 AF400 AF460 AF580 AF750 AF1350 AF1650
Operational power at Ue: 50/60 Hz - according to AC-6a
220 / 240 V kVA 26 30 42 45 55 63 76 95 100 110 130 160 190
380 / 400 V kVA 46 52 73 75 94 108 132 165 170 190 240 275 350
415 / 440 V kVA 50 57 80 80 103 118 144 180 190 210 270 325 390
500 V kVA 60 68 96 100 124 143 173 220 230 250 320 – –
660 / 690 V kVA 80 90 127 130 164 188 228 290 300 310 410 – –
Max. permissible Îpeak A 2100 2400 3300 3500 4300 4900 6000 7700 8400 9300 12000 – –

1SBC101970S0201 - Rev. A

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