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Blue Sea Systems Mini Automatic Charging Relay

Product Description

 The Mini Automatic Charging Relay (M-ACR) is designed to manage the charging current from alternators up to 65 Amps found on most outboards and many inboard engines.

Start Isolation (SI) protects sensitive electronics by temporarily isolating house loads from the engine circuit during engine cranking, protecting the house circuit from voltage sags and spikes.

The compact design allows for three mounting styles: surface, rear, or panel mount. The M-ACR is also available as a module in a Custom 360 Panel.


  • Senses charging on two battery banks
  • Pull off and snap on insulating cover
  • LED indicates ACR status
  • 1 ∕4" x .032" male quick connect terminal for ground
  • 7∕ 16" (11 mm) stud length to accept multiple cable terminals
  • Waterproof – rated IP67 for temporary immersion


Nominal Voltage 12V DC
24V DC
Start Isolation  Yes
Amperage Operating Current 90mA (Combine)
15mA (Open)
Terminal Stud Torque 60 in-lb (6.78 Nm)
Continuous Rating  65A
Intermittent Rating  115A (5 min)
Cable Size to Meet Ratings 6 AWG
Maximum Cable Size 1/0 AWG
Stud Material Tinned Brass
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
Weight 0.80lb (0.36 kg)

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