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→13.3.1 Measuring of Contact Resistance
defined in most standards and acceptance specifications of users. It is important however that a clear definition of the test conditions is given with the specification.
The standard IEC DIN EN 61810-2 defines the application areas of relays according to their load application categories (CC) <xr id="fig:Schematic describing the contact load categories"/> (Fig. 1513.5). The categories CC1 and CC2 are separated by the arc-limiting graph (DC breaking capacity). Switching operations below the graph do not generate electrical arcs, those above the graph are accompanied by electrical arcing.
*CC1 is characteristic for switching operations in control circuits at low voltages, for ex. SPS input signals
*CC0 describes as a special application the voltage – current range for dry circuits
<figure id="fig:Schematic describing the contact load categories">Fig. 13[[File:Schematic describing the contact load categories.5:jpg|right|thumb|Schematic describing the contact load categoriesin in the current-voltage ranges according toIEC DIN EN 61810-2. Arc-limiting graphfor an arc duration < 1 ms]]</figure>
The measuring conditions for contact resistance measurement are defined per IEC DIN EN 61810-7 for the contact load categories as follows:
