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Types of Current Transformers

Learn about the different types of current transformers available on the market including split-core, moulded and DIN rail.

Moulded case feedthrough current transformers

The phase to be measured (conductor rail or line) is fed through the CT window and forms the primary circuit for the current transformer. Feedthrough transformers are predominantly used for mounting on bus bars. Through additional potting, it is possible to achieve droplet-tightness, as well as greater shock and vibration resistance with mechanical loading (IEC 68). This is the most common form of current transformers, with the disadvantage that the primary conductor must be interrupted during installation. This form of transformer is, therefore, most commonly used in new system installations.

Split-core current transformers

Split-core current transformers are frequently used with retrofit applications. With these transformers, the transformer core is open ready for installation and is therefore fitted around the bus bars. This enables installation without interrupting the primary conductor.

Split-core current transformers

Example split-core current transformers

Cable type split-core current transformers

Cable type split-core current transformers are exclusively suitable for installation in isolated primary circuit conductors (supply cables) is weatherproof and dry locations. Installation is possible without interrupting the primary conductor (i.e. with the ongoing operation).

DIN rail current transformer with voltage tap and fuse

The DIN rail current transformer is a highly compact special variant with integrated voltage tap. The DIN rail current transformer comprises a terminal strip, current transformer and the voltage tap terminal with a fuse. The fuse is fitted directly on the primary conductor and the unprotected part of the measurement line is therefore very short. This guarantees a high degree of intrinsic safety.

The DIN rail current transformer is simple to wire, results in low installation costs and a high degree of reliability due to few connections, and is also space-efficient and exhibits only very few connection faults.

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