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Lion Yard Trading
Mercedes-Benz · High-Voltage Battery & Charging

Battery contactors and relays

The heavy relays that connect and isolate the pack from the rest of the car.

How you know it is this

  • The car refusing to power up, with no other fault
  • An audible clunk missing at start-up
  • A high-voltage isolation or contactor fault
  • A car that will not charge

Worth knowing before you buy

  • They fail welded shut or refusing to close, and both are safety-relevant — a welded contactor means the pack cannot be isolated.
  • Far cheaper than a pack, and a common cause of a car that simply will not power up.
  • Inside the pack or its junction unit, so access needs isolation.

What we need to quote it. The chassis number and the fault codes. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Battery packModules and cellsCoolant plates and linesBattery managementContactorsFuse and service disconnectHousing and underbody shield
High-voltage battery — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the traction battery

All high-voltage battery & charging parts
Get in touch

Battery contactors and relays for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)