As the fuse allows for the starting surge of a motor its full load current must not exceed the lesser of the dual current rating. e.g. 20 M25 must not have a continuous load of greater than 20A

Breaking capacity 80kA ac 40kAdc
Rated up to 550Vac/ 250Vdc (Type A1) & 660Vac/ 460Vdc (Type A2)
General purpose (gG) and dual motor rated (gM) types
Low power dissipation
660Vac rated (A1 types 415Vac)
ASTA 20 certified.