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Blue Sea Systems BatteryLink™ Automatic Charging Relay

Product Description

Automatically manages the charging of two battery banks and can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics. Rated at 120A continuous and supports high-output alternators. Built in LED light indicates when batteries are combined and blinks when the under voltage or the starting isolation feature is engaged.

Clip-on cover protects terminal connections. 12/24V auto ranging voltage
input. Hermetically sealed contacts/vapor-proof. Ignition protected, Safe for
installation aboard gasoline powered boats. Meets UL 1500, SAE J1171 external
ignition protection requirements and is IP67 certified for temporary immersion
for 30 minutes.

Automatically shares single source of charge with Auxiliary Battery Features

  • 120 Amp continuous rating
  • 12/24V DC auto ranging voltage input
  • Senses charging on two battery banks
  • Side and bottom knockouts for cable connections
  • Clip-on cover insulates terminal connections
  • 7∕8" (22 mm) stud length to accept multiple cable terminals
  • Integrated LED indicates ACR status
  • 1∕4" × .032" male quick connect terminals for ground and optional features
  • Largest battery bank cannot exceed Group 27

Optional Features

  • Optional Auxiliary Battery Priority connection shares the alternator charge with the Auxiliary battery longer when the engine is running to allow the use of auxiliary loads for an extended period of time
  • Remote LED remotely indicates ACR states - requires optional LED


Nominal Voltage 12V DC
24V DC
Auxiliary Battery Priority  Yes
Amperage Operating Current 175mA @ 12V (Combine)
115mA @ 24V (Combine)
15mA (Open)
Continuous Rating  120A
Intermittent Rating  210A (5 min)
Maximum Cable Size 1/0 AWG
Maximum Torque 140 in-lb (15.82 Nm)
Stud Material Tinned Copper
Terminal Stud Size 3/8" - 16 (M10)
Combine 30 sec 13.6V @ 12V
27.2V @ 24V
Combine 2 Min 13.0V @ 12V DC
26.0V @ 24V DC
Over Voltage Lockout 16.0V @ 12 V
32.0V @ 24 V
Open Low 12.75V @ 12 V
25.5V @ 24 V
Open Low 12.25V @ 12V
24.5V @ 24V
Weight 1.25lb (0.57 kg)



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