„Fritting“ means increasing of digital input current consumption from
approx. 2.5 mA to 25 mA at 24 V DC for 1 ms (with 16 ms period). This function can be activated and deactivated separately for each input. The Fritting function makes the resistance of connected relay contacts against oxidation much higher. This function is switched off by default.

Kolega, možda ti posluži sledeća definicija i veb-stranica:
"The term fritting describes the electrical breakdown of the oxide/foreign layer when a sufficiently high voltage (fritting voltage) is applied across a closed contacts..."
http://relays.tycoelectronics.com/schrack/pdf/C0_v4bg_4.pdf