VERDER CARBOLITE GERO HZS 12/900 Installation, Operation And Maintenance Instructions page 13

3-phase L1
L2
L3
N
PE
DO NOT connect a product ordered for three phase use to a single
phase supply or to the wrong type of three phase supply.
Black to phase 1
Black to phase 2
Black to phase 3
Light Blue to neutral (except delta)
Green/ Yellow to earth (ground)
2.0 Installation
13