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EI Series - Single Phase Transformers
EI laminated-core control transformers power low-voltage control and lighting circuits. 15-100 VA, 220 V primary to 24 V secondary, compact for panel mounting.
Model Number Breakdown
Key Features
- Laminated EI silicon steel core for low cost and reliable performance
- Compact design for control panels and lighting circuits
- Multiple secondary taps for flexible control voltage
- Class B insulation for standard industrial environments
Applications
- Industrial power systems
- Commercial buildings
- Infrastructure projects
TECHNICAL DRAWING
Model: EI-40VA | Type: Oil-immersed transformer | Capacity: 40 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 | 15–100 VA |
| Input voltage | 220V |
| Output voltage | 24V |
| Frequency (Hz) | 50/60 |
| Efficiency | ≥85% |
| 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 |
|---|---|---|---|---|---|---|---|---|
| EI-15VA | EI | 15VA | 220V | 24V | 50/60 | 70 kg | 57x25 | |
| EI-20VA | EI | 20VA | 220V | 24V | 50/60 | 90 kg | 57x30 | |
| EI-25VA | EI | 25VA | 220V | 24V | 50/60 | 110 kg | 66x28 | |
| EI-30VA | EI | 30VA | 220V | 24V | 50/60 | 130 kg | 66x32 | |
| EI-40VA | EI | 40VA | 220V | 24V | 50/60 | 130 kg | 76.2x32 | |
| EI-50VA | EI | 50VA | 220V | 24V | 50/60 | 130 kg | 76.2x35 | |
| EI-70VA | EI | 70VA | 220V | 24V | 50/60 | 130 kg | 76.2x42 | |
| EI-80VA | EI | 80VA | 220V | 24V | 50/60 | 130 kg | 85.8x40 | |
| EI-100VA | EI | 100VA | 220V | 24V | 50/60 | 130 kg | 85.8x50 |
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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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