A suspension arm for a vehicle wheel suspension having an intended breakpoint is described. The sublatches each have input circuitry, an output node coupled to the sublatch’s input circuitry and feedback circuitry coupled to the sublatch’s output node for reinforcing an output signal of the sublatch. The guide heat component has a first end contacting the circuit substrate and a second end contacting with fins, which are provided with the heat dissipating device. The connecting member operatively connects the shift unit to the first operating lever. The Zener diode is formed by the junction of an n-type impurity-diffusion layer continuous with the drain region and a p-type impurity-diffusion layer.