The invention concerns a container floor plate, in particular for a refrigerated container, with an upper floor layer, a lower floor layer and an intermediate insulating layer, support blocks being located between the upper floor layer and the lower floor layer. To hold the brace in its activated position where it supports the barrier, some examples of the brace include a tooth that engages a detent in a catch. The first zero-crossing detection circuit detects a voltage level crossing on a first electrical signal corresponding to a first line voltage.