Voltage Sensing Relay (VSR) — 12V Split Charge Relay

NCC Trained · Victron Dealer

Voltage Sensing Relay (VSR) — 12V Split Charge Relay

Rayne Automotive

£28.36

Warranty 1 year

Available to order

Design your full system

183 five-star Google reviews

Delivery

Dispatched every Monday and Thursday with next-day delivery

  • Made in the UK · NCC & Victron trained team
  • Technical support from the people who build the systems
  • Need help? Speak with an expert

About this product

SPLIT CHARGE · AGM & GEL ONLY
✓ No Programming✓ 120A Continuous✓ Automatic Operation✓ Budget-Friendly
Microprocessor-controlled heavy-duty relay that automatically connects batteries when the engine runs

Connects your starter and leisure batteries automatically whilst the engine is running and isolates them when parked. This Victron voltage-sensing relay keeps your starting battery protected whilst delivering reliable charge to your leisure battery from standard alternators. It operates completely automatically without requiring Bluetooth, apps, or complex programming. If you need a straightforward fit-and-forget charging solution for traditional AGM or gel batteries on standard alternators, this is the ideal choice.

  • Microprocessor-controlled — not a simple voltage switch
  • 120A continuous current rating
  • Automatic engagement at 13.8V, disengagement at 12.8V
  • No programming or Bluetooth needed — set and forget
  • Compatible with AGM, gel, and lead-acid batteries (NOT lithium)
  • Does NOT work with smart alternators (Euro 6 engines, 2015+)

🔧 Tech Specs

Shared
  • Type : Victron Cyrix battery combiner (voltage-sensing relay)
  • Max Current : 120A continuous
  • Engage Voltage : 13.8V
  • Disengage Voltage : 12.8V
  • Voltage Trend Monitoring : Yes (microprocessor)
  • Battery Compatibility : AGM, gel, lead-acid (NOT lithium)
  • Smart Alternator Compatible : No
  • Bluetooth : No
  • Dimensions : 68 × 50 × 50mm
  • Weight : 0.3kg
  • Warranty : 5 years (Victron)

🔌 You Might Also Need

Split Charge Cable Kit

Van-specific cable kit

12V Fuse Box

6-way (SC7) or 12-way (SC6)

Leisure Battery

AGM or gel to suit

Questions and answers

Can Rayne Automotive help me choose the right option?

Yes. Use the System Builder for a full specification, or book a consultation and tell us what you want to run and what is already fitted.

Do you supply trade accounts?

Yes. Van converters can apply for a Rayne Automotive trade account for kit pricing and support.

Is help available after I buy?

Yes. The Help Centre carries installation instructions, and the team supports what it sells.

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Building the complete electrical system?

Plan the charging, storage and distribution together with the System Builder, browse the example complete systems, or book a consultation and tell us what you want to run and what is already fitted.

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