ABB 6517U-101-500 Manual Del Usuario página 23

Installation
1.1.1.13
Caution!
The series-connected fuse must be disconnected
when working on the lighting system.
The dimmer is built into a standard flush-type box; it may
only be used with the associated covers.
Observe the wiring diagrams shown in figure 1 (breaking
circuit) and figure 2 (two-way circuit).
Caution!
When using transformers, each transformer must be
fused individually on the primary side and with a
thermal link according to the manufacturer's
specifications. Wound safety isolating transformers
according to DIN VDE 0551 must be used
exclusively.