Berker 91820 Flush-Mounted Twin Device Box with Strain Relief for Mobile Applications, 45 mm, Grey

For installations in caravans, motorhomes, and other mobile environments, the Berker 91820 flush-mounted box solves the two biggest pain points: limited space and cable movement. Unlike standard domestic boxes, this 45 mm diameter unit packs two device positions into a compact footprint while integrating strain relief directly into the housing. That means your sockets, switches, or data outlets stay firmly anchored even when the vehicle is on the move.

Highlights

• Twin configuration accepts two Berker system inserts in a single 45 mm cut-out
• Integrated strain relief secures flexible cables against pull and vibration
• Halogen-free thermoplastic housing for enhanced safety in confined spaces
• IP20 rating suitable for interior dry areas
• Glow wire tested to 850 °C per DIN EN 60670-1

In daily use

Installation is straightforward: drill a 45 mm hole, insert the box, and snap in your chosen Berker inserts. The strain relief clamps hold cables firmly without damaging insulation, preventing loose connections over time. The grey finish blends discreetly with standard interior panels, while the 32 mm depth leaves room for wiring behind the box. Because it is halogen-free, it contributes to lower smoke and toxic gas emissions in the event of fire.

Full specifications

• Product type: Flush-mounted device box
• Application area: Mobile applications (caravans, motorhomes)
• Mounting type: Flush mounting
• Diameter: 45 mm
• Installation depth: 32 mm
• Material: Thermoplastic, halogen-free
• Colour: Grey
• Configuration: Twin / double
• Number of device positions: 2
• Cable entry: Flexible entries with strain relief
• Protection class: IP20
• Glow wire test: 850 °C
• Standard: DIN EN 60670-1
• Compatibility: Berker system inserts

Final note

When space is tight and reliability is non-negotiable, the Berker 91820 delivers a professional-grade solution that keeps your mobile electrical installations secure and tidy.