This DIN mount fits the Shelly DIM2 devíce for electrical cabinets on DIN rails.

UL94 rated flame retardant plastic for electrical installation.

It can be mounted and removed easily from the front, no need to remove fuses or other devices around the Shelly device.
It is locked in place, use a small screwdriver to detach it at the top, same way you detach a normal fuse device.

5mm air-gap is ensured with permanent 5mm “distance” taps on each side of the mount. If you add multiple shelly Dim2 DIN mounts on the same row, 5mm air-gap is still ensured

The Shelly DIM2  device itself seen in the picture is not included in the delivery.