BK Series & JBK3 Series Control Transformers
Customized control transformers are available upon request

Features of BK and JBK3 Series Control Transformers
Electrical Specification
BK series machine tool control transformer is suitable for circuit of 50~60Hz, voltage up to 500V, usually applied as power supply for machine tool electrical appliances, local lightings and indicator lamps.
Input voltage: rated voltage ±10%
Output voltage: rated voltage +5% (no load)
Efficiency: ≥95%
Waveform distortion: no additional waveform distortion
Protection: over-current protection
Insulation resistance: ≥50MΩ
.Electric strength: no breakdown or flashover phenomenon under power frequency sine voltage of 2000V for 1min
Working Conditions
Ambient temperature: -15°C~+40°C
Altitude: <2000m
Relative humidity: <90%
Environment exists without gas, steam, chemical deposition, dust or dirt that will affect transformer’s insulation seriously, also explosive or corrosive medium is not allowed.
Multiple models to choose

Model NO | A( in mm) | C (in mm) | B (Max in mm) | D(Max in mm) | E(Max in mm) | Mounting hole
(K*J in mm) |
BK-25-50 | 56+/-0.5 | 53+/-2 | 80 | 74 | 85 | 4.8*9 |
BK-100 | 64+/-0.5 | 65+/-2 | 86 | 84 | 92 | 4.8*9 |
BK-150 | 84+/-0.5 | 80+/-2 | 96 | 97 | 110 | 5.8*11 |
BK-200 | 84+/-0.5 | 87+/-2 | 96 | 105 | 110 | 5.8*11 |
BK-250 | 84+/0.5 | 90+/-2 | 96 | 110 | 110 | 5.8*11 |
BK-300 | 90+/-0.5 | 98+/-2 | 120 | 120 | 125 | 7*13 |
BK-400-500 | 90+/-0.5 | 104+/-2 | 135 | 128 | 125 | 7*13 |
BK-500 | 110+/-0.5 | 97+/-2 | 152 | 125 | 147 | 7*13 |
BK-1000 | 111+/-0.5 | 113+/-2 | 170 | 148 | 165 | 7*18 |
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