Understanding HGV Trailer Couplings

faqs -> product-knowledge

Trailer couplings refer to both the electrical and pneumatic lines that span between, and connect, the tractor unit and trailer.

They comprise:

• Primary Electrics (24N - ISO 1185) UK only
• Secondary Electrics (24S - ISO 3731) UK only
• ABS/EBS (ISO 7638-1) Mandatory across all of Europe, including the UK
• 15 Pin Electrics (ISO 12098) Europe only
• Red emergency airline
• Yellow service airline

The airline coupling type varies slightly between the EU and the UK.