Automatic Charging Relays m-ACR

m-Series Automatic Charging Relay - 12/24V DC 65A


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
MSRP: $85.99
Where to Buy Find a TECH Installer Compare
Nominal Voltage12V DC
24V DC
Start Isolation Yes
Amperage Operating Current90mA (Combine)
15mA (Open)
Terminal Stud Torque60 in-lb (6.78 Nm)
Continuous Rating 65A
Intermittent Rating 115A (5 min)
Cable Size to Meet Ratings6 AWG
Maximum Cable Size1/0 AWG
Stud MaterialTinned Brass
Terminal Stud Size1/4" - 20 (M6)
Relay Contact PositionSPEC_HEADER
Combine 30 sec13.6V DC
Open 10 sec12.35V DC
Open 30 sec12.75V DC
Open High16.0V
Undervoltage Lockout 9.5V
Weight0.80lb (0.36 kg)
Included With
7649Mini Add-A-Battery Kit - 65A
7649003Mini Add-A-Battery Kit - 65A [Boxed]
Meets the following Regulatory Specifications
CE Marked
Ignition Protected
ISO 8846
SAE J1171
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