Understanding HGV Trailer Couplings
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.
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