Current transformer with openable core 250-5A class 0.5 TO-250-5

Current transformer with openable core – precise measurements and installation protection

This current transformer is a reliable tool for measuring current in electrical circuits. The design with an openable core allows for installation without interrupting the circuit, which is especially important in existing installations. Designed for both professional installers and end-users, it provides accurate measurements and effective protection against overloads and short circuits.

Characteristics and application

The TO-250-5 current transformer with a class of accuracy 0.5 is a device used to convert large primary currents into smaller, safe secondary currents that can be measured by standard measuring instruments. Its main task is to enable monitoring of the electrical installation load and ensure the proper operation of protective devices. Thanks to the openable core, installation is quick and convenient – simply open the core, place the energized conductor inside and close it.

The transformer finds application in:

• Measurement systems: for monitoring electricity consumption.
• Electrical switchboards: as an element of the protection and control system.
• Industrial applications: in machines and equipment requiring precise current measurement.
• Building installations: to ensure safety and energy efficiency.

Construction and user parameters

The design of the transformer has been designed with ease of installation and reliability in mind. Made of high-quality materials, it provides durability and resistance to environmental conditions. The connection of the secondary circuit is realized by means of screw terminals, which guarantees a secure electrical connection. The height and width of the opening are 32 mm and 21 mm respectively, allowing it to be adapted to different conductor diameters. The rated primary current is 250 A, and the secondary current is 5 A with an apparent power of 1.5 VA. Accuracy class 0.5 ensures precise measurements even under high loads. Additionally, the transformer has touch protection to increase safety. The FS 5 surge factor means that the transformer can temporarily withstand a current much higher than the nominal one without damage or loss of accuracy – which is important when starting motors or other devices generating high inrush currents.