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Everything about technical terms, abbreviations, protection classes & the determination of the X-dimension from the KRONENBERG world. Here you find answers to the most FAQ’s.

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Service is important to us and part of our corporate culture. That is why we provide you with useful information about the technical terms and abbreviations used in our catalogue on this site. We also offer you information on the protection classes described in the catalogue and valuable information on how to determine the X-dimension.

ACalternating current
DCdirect current
NCnormally closed contact
NOnormally open contact
COchangeover contact
Uirated isolation voltage
Ithconventional thermal current in free air
Uimprated impulse withstand voltage
Uerated operational voltage
Ierated operational current
AC-15utilization category for alternating voltage with inductive load
DC-13utilization category for direct voltage with electromagnetic load
B10dnumber of cycles at which 10 % of electromechanical components have failed dangerously ausgefallen sind
TMmission time
EDduty cycle in %

The levels of protection are indicated by an abbreviation (IPxy), which is composed of the two constant code letters

IP (international protection) and two index numbers for the level of protection.

first index number x: level of protection for protection against contact and foreign bodies

second index number y: level of protection for protection against harmful ingress of water

IPxyindex number xindex number y
IP00no protection against contact and foreign bodiesno water protection
IP20protection against solid objects greater than 12 mmno water protection
IP40protection against grain-shaped solid objects
greater than 1 mm		no water protection
IP44protection against grain-shaped solid objects greater than 1 mmfront side protection against splashing water from all directions
IP54protection against dustfront side protection against splashing water from all directions
IP65protection against dust ingressprotection against  water jets from all directions
IP67protection against dust ingressprotection against immersion (in depths from 150 mm until 1000 mm no detrimental quantity of water may ingress with time limitation)