R-Core Transformers

SK Electric is the exclusive manufacturer of a globally patented, high-efficiency R-core transformer that ranges from 5VA to 2kVA and can be used in medical and audio control devices or any other electrical driven equipment.

Unlike most transformers, SK Electric’s R-core is formed with a closed ring bound in a variable-width electrical lamination. The result is a transformer with reduced heat loss and maximum possible efficiency.

To accurately produce the variable-width strip for the R-core transformer, SK Electric developed a unique automated cutting technique and set of equipment of which it is the sole patent holder.

R-Core Technical Specifications:

R-Core Transformer

Voltage: up to 500V

Rated Power: 5VA to 2kVA

Rated frequency: 50/60Hz

Insulation Class: Class B , Class H

Protection Class: IP00

Cooling method: Natural air

Temperature rise: ≤90 ºC (Class B) , ≤140 ºC (Class H)

HV test: 1,500Vrms/50Hz/60Hz

Elevation above sea level: 3,000m max

Standard: UL/IEC/EN 60601-1, UL/IEC/EN 61558-1,UL 1411

ModelPower (kVA)Voltage (V)Height (mm)Width (mm)Depth (mm)EffWeight (kg)
R-550...500644541970.29
R-660...500645641970.3
R-770...500726543970.32
R-10100...500797045970.34
R-15150...500807550970.45
R-20200...500847551970.52
R-25250...500867850970.6
R-30300...500988252970.7
R-35350...5001018857970.9
R-40400...5001009055970.95
R-50500...5001029660971
R-65650...5001069862971.2
R-80800...50012510065971.4
R-1001000...50012611070971.96
R-1601600...50014012875972.6
R-2602600...50016013080973.1
R-3203200...50016414292973.8
R-6006000...500190155100976
R-100010000...5002271901159710.2
R-150015000...5002451901159715.5
R-200020000...5002502201309720.2