| AUXILIARY
TRANSFORMERS FOR CONTACTOR CONTROL |
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| CONTACTORS | ||||||||||||
| Auxiliary
transformer rating The auxilary transformer must be chosen considering the heaviest load possible during running or starting. The following contribute to the evalutation:. A = in-rush consumption of the contactors being energised; B = steady state consumption; C = consumption of other utilities (pilot light, solenoid valves, etc) The exact calculation would require a separate evalutation of the active and reactive powers and the power factor. With an approximate calculation, the sum of these powers can be made with this formula below: [VA] Transformer = A+B+C. The following tables give therelative transformer power to control our contactors. The transformers are characterised by a maximum 5% voltage drop. |
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| Contactor | Electromagnet data | Transformer | voltage drop | |||||||||
| in-rush | holding | Power | Maximum | |||||||||
| Type | [VA] | cosj |
[VA] | cosj | [VA] | [%] | ||||||
| BG...06-BG...12 | 30 | 0.86 | 4 | 0.27 | 30 | 5 | ||||||
| BF9-BF25 | 65 | 0.75 | 9 | 0.3 | 63 | 5 | ||||||
| BF32 00-BF40 00 | 95 | 0.6 | 12.3 | 0.3 | 63 | 5 | ||||||
| BF40 40 | 210 | 0.5 | 18 | 0.3 | 100 | 5 | ||||||
| BF50-BF110 | 210 | 0.5 | 18 | 0.3 | 100 | 5 | ||||||
| B115-B400 | 300 | 1 | 10 | 1 | 160 | 5 | ||||||
| B500-B630 1000 | 400 | 1 | 18 | 1 | 330 | 5 | ||||||
| B1250-B1600 | 800 | 0.9 | 45 | 0.9 | 450 | 5 | ||||||
| Transformer protection fuses |
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| [VA] | Primary | Secondary | ||||||||||
| Fuse size aM | Fuse size gL | |||||||||||
| 220/230V | 380/400V | 24V | 48V | 110V | 220/230V |
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| 30 | 0.25 | 0.16 | 2 | 2 | 1 | 1 | ||||||
| 50 | 0.5 | 0.25 | 2 | 2 | 1 | 1 | ||||||
| 63 | 1 | 0.5 | 4 | 2 | 2 | 1 | ||||||
| 100 | 1 | 0.5 | 4 | 2 | 2 | 1 | ||||||
| 160 | 2 | 1 | 8 | 4 | 2 | 2 | ||||||
| 220 | 4 | 2 | 10 | 6 | 4 | 2 | ||||||
| 230 | 4 | 2 | 16 | 8 | 4 | 2 | ||||||
| 450 | 4 | 2 | 16 | 7 | 4 | 2 | ||||||
| 630 | 6 | 4 | 25 | 16 | 6 | 4 | ||||||
