Control Transformers
Alliance Engineering Company
Alliance Engineering Control Transformers are dry-type, isolation transformers engineered to supply stable low-voltage power to industrial control circuits under high inrush conditions. Designed for relay panels, PLCs, motor starters, CNC machines, cranes, switchgear, and railway control cubicles. Available from 25 VA to 30 KVA in single and three-phase configurations, with Class B, F, and H insulation. 100% copper wound on CRGO core. Routine-tested before dispatch with test certificate. ISO 9001:2015 manufactured. Compliant with IS 11171 and IEC 61558.
Key Technical Advantages
Capacity Range
25 VA – 30 KVA
Efficiency
≥97% at full load
Winding
100% Copper, CRGO Core
Insulation
Class B / F / H
Certification
ISO 9001:2015
Standards
IS 11171, IEC 61558
Technical Specifications
Validated industrial performance metrics for enterprise deployment.
| Parameter | Specification |
|---|---|
| Capacity | 25 VA – 30 KVA |
| Phase | Single Phase / Three Phase |
| Primary Voltage | 415V / 440V / 380V / 230V AC |
| Secondary Voltage | 12V – 415V AC (110V, 230V, 24V standard) |
| Voltage Tappings | ±2.5%, ±5% of rated primary |
| Frequency | 50 Hz (60 Hz on request) |
| Insulation Class | Class B (130°C) / Class F (155°C) / Class H (180°C) |
| Temperature Rise | ≤75°C (Class B) / ≤100°C (Class F) |
| Efficiency | ≥97% at full load |
| Regulation | ≤4% (typical at full load) |
| Duty Cycle | Continuous (24×7) / Intermittent |
| Cooling Type | Dry-type, Air Natural (AN) |
| Core Material | CRGO Silicon Steel Laminations |
| Winding Material | Electrolytic Copper (Aluminium on request) |
| Insulation Resistance | ≥100 MΩ at 500V DC (megger) |
| Dielectric Strength | 2 kV AC for 1 minute (winding to core/earth) |
| IP Protection | IP00 / IP21 / IP23 / IP54 |
| Mounting | Chassis / Enclosed / DIN Rail / Floor |
| Ambient Temperature | -5°C to +50°C |
| Altitude | Up to 1000 m AMSL (derate above) |
| Standards | IS 11171, IEC 61558-1, IEC 61558-2-2 |
Standards & Compliance
Certified engineering excellence across regional and global regulatory frameworks.
IS 11171
Indian standard for dry-type power transformers.
IS 2026
Compliance with standard engineering and safety performance metrics.
IEC 61558-1
Compliance with standard engineering and safety performance metrics.
IEC 61558-2-2
Compliance with standard engineering and safety performance metrics.
IEC 60085
Compliance with standard engineering and safety performance metrics.
IEC 60529
Compliance with standard engineering and safety performance metrics.
ISO 9001:2015
Certified Quality Management Systems for precision manufacturing.
Industrial Customizations
Our modular engineering workflow allows for specific adaptations to meet your site-specific infrastructure requirements. Consult with our technical team for bespoke builds.
KVA / VA Rating
25 VA / 50 VA / 100 VA / 250 VA / 500 VA / 1 KVA / 2 KVA / 5 KVA / 10 KVA / 15 KVA / 20 KVA / 25 KVA / 30 KVA (custom ratings available)
Phase
Single Phase / Three Phase
Primary / Secondary Voltage
Primary: 415V / 440V / 380V / 230V | Secondary: 12V–415V AC (110V, 230V, 24V standard)
Winding Material
Copper (standard) / Aluminium (on request)
Insulation Class
Class B (130°C) / Class F (155°C) / Class H (180°C)
Enclosure Type
Open Type (IP00) / Sheet Metal Enclosed (IP21–IP54) / Resin Cast (IP64) / Oil-Cooled
Transformer Type
Fixed Ratio (2-winding) / Auto-Transformer / Variable (Variac)
Built-in Protection
None (standard) / Primary HRC Fuse / Primary MCB / Primary MCB + Secondary Fuse + Thermal Relay
Special / Railway Grade
Standard / RDSO Specification / Custom OEM
Engineering Consultation
Connect with our technical desk for bulk specifications, tender support, or specialized engineering requests.
