6A double pole MCB.  Typically used on Bailey, Coachman and Eldis Power Distribution Units/Consumer units. 

Double pole isolation is now mandatory on Caravans and Motorhomes due to the increased likelihood of reverse polarity.

Technical spec:-

• 6A trip current
• C Curve Characteristic
• Operating voltage: 230/415V AC 50/60Hz
• Approved to IEC/EN 60898
• Fits on Industry standard DIN rail
• 36mm wide – double DIN width
• 6000A breaking capacity