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Blue Seas Systems 500 Amp Automatic Charging Relay

SKU# BS7622
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Blue Seas Systems 500 Amp Automatic Charging Relay may require an additional to 2 days to ship.


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Item# 7622


  • Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing.
  • Includes ML-Series Remote Control Contura Switch PN 2146.
  • Automatically manages the charging of two large battery banks.
  • Allows paralleling of battery banks for emergency starting.
  • 500 Ampere continuous rating to support high-output alternators.
  • Magnetic Latch (ML)—ACR draws very low current (<40mA to monitor terminal voltage) in the "ON" or "OFF" states, and draws moderate. current for very short time when changing state.
  • Dual sensing—senses charge on both battery banks.
  • Start Isolation (SI)—can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics.
  • Engine Isolation (EI)—can be configured for isolation of two engines while both are running to protect engine electronics and maximize alternator output.
  • Senses charging on two battery banks.
  • LED output to remotely indicate when batteries are combined, isolated, in voltage lockout, or in Start or Engine isolation.
  • 3/8"-16 tin-plated copper studs for maximum conductivity and corrosion resistance.
  • 7/8" (22mm) stud length accepts multiple cable terminals.
  • Silver alloy contacts provide high reliability for switching live loads
  • Label recesses for circuit identification.


  • Control Circuit Connection: Tinned Wire
  • Nominal Voltage:12V DC
  • Manual Control:Yes
  • Engine Isolation:Yes
  • Mounting:10
  • Start Assist: Yes
  • Start Isolation:Yes
  • Amperage Operating Current:13mA
  • Amperage Operating Current when changing state:<7.0A
  • Terminal Stud Torque:140 in-lb (15.82 Nm)
  • Continuous Rating:500A
  • Intermittent Rating:700A (5 min)
  • Cranking Rating 30 sec: 1450A DC
  • Minimum Operating Temperature:-10° C
  • Maximum Operating Temperature: 60° C
  • Cable Size to Meet Ratings:4/0 AWG x 2
  • Live Current Switching:300A 12V DC
  • Stud Material:Tinned Copper
  • Switching Cycles:100000
  • Terminal Ring Diameter Clearance:1.12in (28.45 mm)
  • Terminal Stud Length:1.50in (38.1 mm)
  • Terminal Stud Size:3/8" - 16 (M10)
  • Wire Size:20 AWG

Relay Contact Position:

  • Combine 30 sec:13.5V
  • Combine 90 sec:13.0V
  • Open 10 sec:12.35V
  • Open 30 sec:12.75V
  • Open High:16.2V
  • Weight:2.06lb (0.93 kg)