Electrical control components are how the machine decides what to do and when to stop. Switches send the commands, sensors read the conditions, breakers and fuses protect against the accidents. When one fails, the machine either does nothing or does something worse — and either way, diagnosis is a matter of tracing the signal through the circuit until you find the piece that isn't behaving.
This is the genuine Nilfisk Advance OEM RIGHT SAFETY SWITCH, part number 55947976, brand new in the box. Fuses and breakers especially deserve genuine OEM replacements — the wrong rating either nuisance-trips or fails to protect what it's supposed to protect.
Not sure this is the right electrical part for your machine? Send us the model and serial and we'll confirm before you order.