IP - protection class
The degree of protection designation is always shown by the letter pair IP appended by two digits. These indicate the degree of protection of a casing with regard to contact and foreign bodies (first digit) and moisture or water (second digit). You will find more details here: https://en.wikipedia.org/wiki/IP_Code

Mechanism group
Electric chain hoists are classified into groups depending on the load and operating time (ISO4301-1). From these the theoretical useful life of the mechanical components located in the power drive and the drive unit (motor) is measured in full load hours.
 

Load spectrum
Depending on load type (light to heavy) in % of the operating time, electric chain hoists are divided into load ranges, which are needed for classification in the mechanism groups.

Contactor control
GIS electric chain hoists are fitted with a 42 V contactor control as standard. In the control switch, which controls the operating current (high voltage), only low voltage current flows.