Capacitor for Hanovia medium-pressure ultraviolet disinfection systems, 2.4 kV, 4 µF, ±5% tolerance, part 660077-0406 — the largest of the three values Hanovia lists in this family. It sits in the lamp control gear, where it sets the circuit conditions the medium-pressure lamp needs to strike and run stably. The suffix encodes the capacitance: 660077-0106 is 1 µF, -0206 is 2 µF and -0406 is 4 µF, so match the value printed on the can rather than assuming from the system model. Reference number 22123-0216.