Mounting feet are used to mount components that cannot be snapped directly on a DIN rail.
Weidmuller FM 4/TS35 M4 Snap-on Mounting Foot for TS35 DIN Rail
Removed
Weidmuller FM 4.2/TS35 M4.2 Snap-on Mounting Foot for TS35 DIN Rail
Weidmuller FM 5/TS35 M5 Snap-on Mounting Foot for TS35 DIN Rail