Current transformer | Weidmüller Product Catalogue

Current transformer

Current transformers convert "high" currents (<750 A) of a 1- or 3-phases network into
"low" currents (5 A or 1 A).

Our Power Monitor (51A) or the current measuring transformer series WAS(Z) CMA/CMR
require these current transformers to record and convert the
electrical parameters.

In such cases, Weidmüller uses the proven current transformers from MBS; these
ideally round off the Weidmüller portfolio.

The cable-type current transformers can also be quickly retrofitted
in existing systems.

The pluggable current transformers are particularly suitable for installing
on the busbar.

Product group overview

	Cable-type current transformer	The cable-type current transformer is primarily used in retrofitting to avoid splitting the primary conductors. Thanks to its dimensions and ease of handling, the cable-type current transformer is particularly suitable for use in places that are difficult to access or in case of limited space In combination with the securing clamps, the "click" system even enables "one-handed" installation.

	Difference current transformer (Residual current monitoring, RCM)	For detection of residual currents in 3- / 4-wire AC systems. Features: High-sensitive current sensor for detecting even smallest fault currents Fixed hysteresis at 5% High security due to integrated overvoltage protection Wide frequency range

	Mini current transformer	The CMA-CTM 7 series mini current transformer is an inductive current transformer designed according to the transformer principle for circular primary conductors. The CMA-CTM 7 series current transformers are maintenance-free and is designed for measuring primary currents in the range 32 A to 64 A. This is converted into a current up to 1 A on the secondary side. With its small dimensions, it perfectly suits applications in a 3-phase circuit breaker with a phase separation of 17.5 mm.

	Plug-on current transformer	The pluggable current transformers are particularly suitable for installation on the busbar. Advantages: Screwless connection system with tension-clamp terminal. Time-saving connection option for solid and flexible conductors. Shock-proof and resistant to vibration, high mechanical retention forces. High current resistance

	Rogowski coils	Rogowski coil A Rogowski coil is a closed air coil without a ferromagnetic core used for floating potential measurement of AC and pulse currents. Measurement with the Ragowski coil is used widely in technology, as it can be retroactively integrated without separating the primary electric circuit in existing systems. Because this method shows no saturation effect, even the smallest currents and high-frequency harmonics can be measured without loss of accuracy.

Cable-type current transformer:

Difference current transformer (Residual current monitoring, RCM):

Mini current transformer:

Plug-on current transformer:

Rogowski coils: