The ED-BR is your insurance policy for lodaing/unloading situations.
The manual wedge placed under the truck wheel, maintain it in its loading / unloading position. If the wedge is not engaged the dock leveller cannot work.
A Wedge and cable aggregate: 220/380 V TRI
Can be linked to:
Traffic lights (red/green): inside or outside
Sectional Door
Horn
Inflatable Dock Shelters