Rudi,
That looks like a solid-state flipper EoS switch, which is closed when the flipper is energised. The older-type high current flipper used a switch with heavier contacts, and they were closed with the flipper at rest, i.e the longer blade was furthest from the coil, and nearest to the switch mounting 'spur'.
Electrically speaking, opening the switch brings the secondary winding into circuit and reduces the current flowing through the coil, switches and relay contacts.
FirePower also has a second (matrixed) switch on the right-hand flipper, to operate the 'Lane Change'.