02. November 2017

Han® SP Module: Surge protection in a modular connector

Han® SP modules

HARTING has developed a protective circuit which is placed in the connector in order to protect common signals in the instrumentation and control area (I&C). The advantage for the customer: Digital and analogue circuits are securely protected.

Since these signals can be of different types, in addition to a modular combination for I&C signals with common reference potential – frequently digital signals – HARTING also offers a combination for differential signal transmission or for transmission without a common reference signal. These are generally differential signals such as bus interfaces up to 5Mhz or analogue signals such as 0/4-20 mA or 0/2-10 V.

Both types – the two-channel for differential signals and the four-channel type for signals with common reference potential – can transmit nominal 24V DC and up to 0.5 A. The protection level is approximately 50V depending on the type.

Schematic for the transmission of the signals

Schematic for the transmission of the signals


Transients, which can disturb signal circuits and destroy electronic devices, are discharged to the ground via an appropriate spring element and the grounded Han-Modular® hinged frame.
This ensures interference-free transmission of the signal. When used correctly, the surge protection modules reduce the number of operating faults, increase the service life of the production line, and ultimately increase plant uptime. Additional costs are avoided, and the profitability of the production plant is maintained.