Current transformers convert "high" currents (< 5000 A) of a 1 or 3 phase network into "low" currents (1 A or 5 A).
Our energy measuring devices require these current transformers in order to record and convert the electrical parameters.
Weidmüller relies on the proven current transformers from MBS, which ideally round off the Weidmüller portfolio.
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.
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 transformers are especially suitable for mounting on the busbar.
The advantages of this type are: screwless connection technology with tension clamp connection, time-saving connection option for solid and flexible conductors, shock-resistant and vibration-proof, high mechanical holding forces and high current resistance.
Difference current transformer (Residual current monitoring, RCM)
This type is specialised in the detection of residual currents in 3 / 4-wire AC networks.
Its special features are:
Highly sensitive current sensor for the detection of even the smallest residual currents, fixed switching hysteresis of 5%, high safety thanks to integrated overvoltage protection and coverage of a wide frequency range.
The simple conversion of "large" currents (100 - 500 A AC) into an analogue value without intermediate steps. Suitable for downstream devices, e.g. limit value detection.
Rogowski coils:
Split core current transformer:
Mini current transformer:
Plug-on current transformer:
Difference current transformer (Residual current monitoring, RCM):
