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 (1) Yes
Amperage Operating Current 90mA (Combine) 15mA (Open)
Terminal Stud Torque 60 in-lb (6.78 Nm)
Continuous Rating (2) 65A
Intermittent Rating (3) 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 @ 12 V / 27.2V @ 24 V
Open 10 sec 12.35V @ 12 V / 24.7V @ 24 V
Open 30 sec 12.75V @ 12 V / 25.5V @ 24 V
Open High 16.0V @ 12 V / 30.0V @ 24 V
Over Voltage Lockout 16.0V @ 12V / 32.0V @ 24V
Under Voltage Lockout (4) 9.5V @ 12 V / 19V @ 24 V
Weight 0.80lb (0.36 kg)

1) Condition: Engine starting

  • Relay is open isolating batteries
  • Batteries are isolated to protect sensitive electronics from voltage sags and spikes

2) The maximum current a switch is designed to conduct for an indefinite period.

3) The maximum amount of current a switch is designed to carry for a minimum of a designated period of time.

4)  As a safety feature, some ACR's prevent combining into a severely discharged battery. A dual-sensing ACR will monitor the voltage on both batteries and will not connect if either battery is below the under voltage lockout level. Use caution when combining into a battery with extremely low voltage, because this might represent a faulty battery or a problem elsewhere in the system.

SKU 632085076016
Barcode # 7601-BSS
Brand Blue Sea Systems
Shipping Weight 0.3000kg
Shipping Width 0.170m
Shipping Height 0.080m
Shipping Length 0.100m
Shipping Cubic 0.001360000m3

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