Knopp is primarily known for transformer test equipment, precision voltage and current transformers, and electrical instruments. Located along the beautiful San Franciso Bay, Knopp offers a variety of products that compliment the TESCO brand.
Since 1928 Knopp has been providing dependable and accurate products to electric utilities, government (federal, state, and municipal), professional electricians, and manufacturers of transformers and electric motors all over the world.
Knopp has developed a worldwide reputation for designing and manufacturing voltage and current transformers with extremely high accuracy. Our capabilities include precision voltage transformers up to 36,000 volts and current transformers up to 10,000 amperes. Typical accuracies are well within ±0.02% on ratio and ±2 minutes on phase angle.