5-step switches adjust the fan speed of the WCU's. One switch can operate several units.
To select the switch with the correct amperage, just add the values of the absorbed currents from the selected WCU's.

Article numbers:
5-step switch 2,2 Amp.  - IA.8506
5-step switch 3 Amp.     - IA.8512
5-step switch  5 Amp.     - IA.8513
5-step switch  7 Amp.     - IA.8514
5-step switch  11 Amp.   - IA.8515
5-step switch  15 Amp.   - IA.8516