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High-current Test Probes

High current test probes are used in several industries and applications with high currents, such as testing, function tests, signal transmission, power supply in production, as well as assembled contact elements.
Another field of application is precise measurement, which requires test probes with very low internal resistance, so-called low Ohm test probes.

For secure transmission of high currents the plungers in INGUN high current test probes consist of two parts. During the stroke movement the plunger parts are deflected away from each other in a radial direction. In doing so, the plunger parts press against the barrel and the transfer resistance (Ri) is reduced. This principle allows the transmission of high currents with limited warming. The power loss, which causes warming, is calculated using the formula PV=Ri*I2.

Depending on the application and the related test demands, INGUN offers various high current test probes (HSS):


Standard HSS
Are unrivalled HSS probes with an optimal ratio of rated current load of 20 to 100 Amps in a compact design. Both press-in versions and screw-in versions are available.

Short-stroke HSS and long-stroke HSS
Are used in applications where limited test space is available, or contacting which requires a long stroke (e.g. dual-stage contacting).

Dipole high current probes (Kelvin probes)
Four-wire measurements can be performed to precisely define resistance. In doing so, the voltage on the inner conductor and the current on the outer conductor are measured.

High current clamps (round/flat)
Are used to contact flat connector blades and round posts, such as those found in plug connectors. PCBs and threaded bolts can also be contacted.
Four-wire clamps are suitable for performing four-wire measurements.

Robust high current probes
Are used wherever challenging atmospheric conditions, side force or vibrations can occur. These robust probes are also suitable as a permanently-assembled contact element in machinery.


Installation of high current probes
Various installation options are available to mount the probes. The high current test probes can either be pressed in or screwed in the receptacle. Mounting without a receptacle is also possible.

Screw-in probes are recommended for applications with vibrations, overhead installation and where there is a danger of test probe moving out of the receptacle (snapping effect). Screw-in probes have the designation ‘M’ at the end of the part number.

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