This is a pack of different generators that can be used as loads on trucks and for lifting cranes.
The number before the period is the weight in metric tons and the numbers after the first period is the width in meters.
The name begins with the type of load, followed by the weight in metric tons.
The last is the width.
Example:
EM-43.3
EM = Electric Motor
43 = weight 43 metric tons
3 = width, 3m wide
Weight varies from 57 mt (124,000 lb) to 225 mt (496,000 lb)