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BK Series - Single-Phase Control Transformers
The BK series single-phase control transformers are widely used for machine tool control circuits and signal lighting power supply. Available in 25VA to 5000VA ratings.
Model Number Breakdown
Key Features
- Rated capacity 25VA-5000VA
- Input voltage 220V/380V
- Multiple output voltage taps
- IP00 protection class
Applications
- Machine tools
- Automation equipment
- Control panel power supply
- Signal lighting
TECHNICAL DRAWING
Model: BK-500VA | Type: Oil-immersed transformer | Capacity: 500 kVA
FRONT ELEVATION
ELECTRICAL SCHEMATIC
EFFICIENCY vs LOAD
SIDE VIEW
TOP VIEW
TERMINAL BLOCK
CORE & WINDING
LEGEND:
Specifications Range
All specifications and dimensions can be customized upon request
Model Selector
| Key parameters | Model Range |
|---|---|
| Capacity | 50–3000 VA |
| Input voltage | ≤1000V |
| Output voltage | Custom |
| Frequency (Hz) | 50/60 |
| Efficiency | ≥85%, ≥90%, ≥93% |
| Allowed temperature rise | ≤65 K |
| Short-circuit impedance | ≤8% |
| Insulation class | Class B (130°C) |
| Compare | Model | Series | Capacity (kVA) | Input voltage | Output voltage | Frequency (Hz) | Weight | Dimensions |
|---|---|---|---|---|---|---|---|---|
| BK-50VA | BK | 50VA | ≤1000V | Custom | 50/60 | 130 kg | 77×75×75 mm | |
| BK-100VA | BK | 100VA | ≤1000V | Custom | 50/60 | 130 kg | 86×85×85 mm | |
| BK-160VA | BK | 160VA | ≤1000V | Custom | 50/60 | 130 kg | 96×89×95 mm | |
| BK-200VA | BK | 200VA | ≤1000V | Custom | 50/60 | 130 kg | 96×104×95 mm | |
| BK-250VA | BK | 250VA | ≤1000V | Custom | 50/60 | 130 kg | 96×104×95 mm | |
| BK-300VA | BK | 300VA | ≤1000V | Custom | 50/60 | 130 kg | 120×100×115 mm | |
| BK-400VA | BK | 400VA | ≤1000V | Custom | 50/60 | 130 kg | 120×105×115 mm | |
| BK-500VA | BK | 500VA | ≤1000V | Custom | 50/60 | 130 kg | 120×117×115 mm | |
| BK-630VA | BK | 630VA | ≤1000V | Custom | 50/60 | 130 kg | 150×114×140 mm | |
| BK-1000VA | BK | 1000VA | ≤1000V | Custom | 50/60 | 130 kg | 150×134×140 mm | |
| BK-1500VA | BK | 1500VA | ≤1000V | Custom | 50/60 | 130 kg | 162×135×155 mm | |
| BK-2000VA | BK | 2000VA | ≤1000V | Custom | 50/60 | 130 kg | 192×130×185 mm | |
| BK-2500VA | BK | 2500VA | ≤1000V | Custom | 50/60 | 130 kg | 192×140×185 mm | |
| BK-3000VA | BK | 3000VA | ≤1000V | Custom | 50/60 | 130 kg | 192×150×185 mm |
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Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Read-only: no price factor, not part of the sum — the loss-grade cost is already carried by the efficiency (subtype) base price, so charging here would double-bill. Values come from the product library type-test data, interpolated between published capacities; grades the library does not cover show an em dash, never zero.
Reference prices are for estimation only and do not constitute a formal offer.
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