Why is my transformer humming?
A transformer that hums isn't necessarily defective. An electrical transformer naturally produces a slight hum when it's operating. The laminations in the magnetic circuit expand and contract very slightly…
Transformer Inrush Current: What Causes It and How Can It Be Prevented?
What actually happens when you switch on a transformer. At the precise moment of energising, the transformer can draw a brief but very high current. This peak, perfectly normal, lasts only…
The Role of Isolation Transformers in Protecting People and Equipment
In many industrial, technical, or sensitive environments, the power supply must be reliable, stable, and safe. The isolation transformer meets these requirements precisely. Often unobtrusive within a system, it…
Understanding Transformer Heating and Insulation Classes
At Le Cosinus, we have been manufacturing and supporting transformers, inductors, and DC power supplies for nearly 80 years. But behind every transformer, there is much more than just a…
Transformer Maintenance: What Are the Warning Signs?
At Le Cosinus, a French manufacturer of electrical transformers for nearly 80 years, we have always made it a point of honor to ensure the reliability, durability, and performance of…
What is the impact of harmonics on the electrical transformer?
In modern power grids, harmonics are becoming an increasingly common phenomenon, particularly with the widespread use of electronic equipment and converters. At Le Cosinus, a French manufacturer of…
IP rating: an essential pillar for the safety of electrical transformers
When it comes to electrical transformers, design quality and technical performance are only part of the equation. Long-term safety and reliability also depend on—…
What is the lifespan of an electrical transformer?
Electric transformers are essential equipment in energy distribution and management. Their service life depends on several factors, including their design, use, and maintenance. At…
Le Cosinus: Manufacturer of UL/CSA-Certified Electrical Transformers
For several decades, LE COSINUS has established itself as a key player in the manufacture of high-quality electrical transformers. Thanks to our expertise and commitment to excellence, we…
