• Compatibility
  These probes seamlessly integrate with different current measurement devices, allowing flexibility with clamp meters, series ammeters, or shunt resistors, depending on the selected probe type.

• Operational Versatility
  Current transformers (CT) can be measured with the relay in operation or safely disconnected, providing flexibility in testing scenarios. Also, these probes are available for circuits with 1 phase + 1 return and 3 phases + 1 return.

• Make-Before-Break
  Our probe designs incorporate a make-before-break system, ensuring CT shorting during measurements. Hook probes must be connected to a measuring device or a shunt before insertion, enhancing safety and reliability in testing procedures.

• Coded Pins for Safety
  To prevent improper insertions and mitigate the risk of unwanted electrical configurations, the pins are coded. This meticulous design consideration ensures a secure and error-free connection, avoiding issues such as shorting between voltage circuits.

Application example 01

The electrical diagram below illustrates the utilization of a probe designed for external current measurement using clamp ammeters with the relay in operation. The relay remains connected throughout the insertion and removal procedures, ensuring there are no interferences in its readings.

Application example 02

The electrical diagram below illustrates the utilization of a probe designed for external current measurement using a series ammeter or a shunt. The relay is disconnected by the probe insertion. Though the make-before-break system ensures continues CT shorting the whole procedure. This electrical configuration allow for simultaneous CT measurement and secondary injection operations. 

It is of vital importance to note that probes compatible with shunt or series ammeters DO NOT automatically short-circuit current transformer circuits upon insertion into the test block. These types of probes must always be correctly connected to a measurement instrument or a shunt before insertion into the test block, to prevent the creation of an open current transformer circuit. 

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