Blue Sea Mini Automatic Charging Relay

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Blue Sea M-Series Mini Automatic Charging Relay 65A

The Blue Sea Mini Automatic Charging Relay is designed to manage the charging current from alternators up to 65 Amps found on most outboards and many inboard engines. The m-series charging relay features a compact design that allows for three mounting styles: surface, rear, or panel mount. The Start Isolation option protects sensitive electronics by temporarily isolating house loads from the engine circuit during engine cranking, protecting the house circuit from voltage sags and spikes. This charging relay is ignition protected, making it safe for installation aboard gasoline powered boats.


  • Automatically combines batteries during charging, isolates batteries when discharging
  • Supports alternators up to 65 Amps
  • Senses charging on two battery banks
  • Pull off and snap on insulating cover
  • LED indicates ACR status
  • 1/4" x 0.32" male quick connect terminal for ground
  • 7/16" stud length to accept multiple cable terminals
  • Waterproof - rated IP67 for temporary immersion
  • CE marked for ignition protection
  • Meets ISO 8846 and SAE J1171 external ignition protection requirements


  • Nominal Voltage: 12V DC, 24V DC
  • Amperage Operating Current: 90mA (Combine), 15mA (Open)
  • Terminal Stud Torque: 60 in-lb
  • Continuous Rating: 65 A
  • Intermittent Rating: 115 A (5 mins)
  • Cable Size to Meet Ratings: 6 AWG
  • Terminal Stud Size: 1/4"-20 (M6)

Relay Contact Position:

  • Combine 30 Sec: 13.6V DC
  • Open 10 Sec: 12.35V DC
  • Open 30 Sec: 12.75V DC
  • Open High: 16.0V
  • Under Voltage Lockout: 9.5V

pdficon.pngClick to Download Blue Sea Mini Automatic Relay Instructions

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