Miniature current transformer with openable core 250-5A class 1 TOM-250-5

Current transformer with openable core – precise measurements and installation protection

This miniature current transformer with an openable core is a reliable tool for measuring current in electrical circuits. The openable core design simplifies installation and removal without the need to interrupt the circuit, which is particularly useful during servicing and modernization of installations. The transformer is characterized by high measurement accuracy and provides effective protection against overloads and short circuits.

Construction and application

Through-type current transformer with a 22 mm cross-section, designed to work with primary currents up to 250A. It converts this current into a secondary signal of 5A, which can be used by meters, energy meters, monitoring systems and protective devices. Accuracy class 1 guarantees precise measurements, and the FS 5 overload coefficient ensures safe operation under short-term overload conditions. Thanks to its compact dimensions and the possibility of mounting on a rail or wire, the transformer finds application in a wide range of electrical installations – from residential buildings to industrial plants.

Key features and benefits

• Openable core: Allows easy installation and removal without disconnecting wires, significantly reducing installation and servicing time.
• High accuracy (class 1): Ensures precise current measurements, which is crucial for the correct operation of monitoring and protection systems.
• Universal application: Suitable for mounting on a rail or wire, which increases installation flexibility.
• Safety: Protected against touch, minimizes the risk of electric shock during operation.
• Solid construction: Made of high-quality materials, guarantees long-lasting and reliable operation in various environmental conditions (operating temperature -15°C to +45°C).
• Compliance with standards: Meets the requirements of IEC 60044-1 standard, which confirms its quality and safety.
• Screw connection: Provides a secure and durable connection to the secondary circuit.
• Insulation withstand voltage 2kV/1min: Guarantees a high level of electrical insulation.

The transformer has a rated primary current of 250A and a rated secondary current of 5A. Its diameter is 22 mm, and the accuracy class is 1. The rated apparent secondary power is 1.5 VA, and the overload coefficient is FS 5.

This transformer is an optimal solution both for professional installers looking for a reliable tool for precise measurements, and for end-users who care about the safety and energy efficiency of their electrical installations. Its compact size and ease of installation make it an ideal choice for a variety of applications.