The U-Line starters have integrated suppression. What type of suppressor do we use?
The LUC`s A1 & A2 terminals are connected to a high power carbon resistor (used as current/voltage damper) connected in series with a varistor limiting electronic circuit control voltage available at its terminals. Capacitors (to cope with circuit current demand) are connected in parallel with the varistor. The coil itself has a diode + Zener diode to limit the voltage on de-energization to around 24v. No additional suppression is required.