What does an automatic charging relay do?

It connects two battery banks when a charge source raises voltage, so both charge, then disconnects them when charging stops so the start battery is not drained.

Is this the 12V or 24V version?

This is the 24V DC model with a 24V coil. It will not work correctly on a 12V system; Blue Sea makes separate 12V ACRs.

How is it different from the ML-ACR?

The ML-ACR adds a manual override knob and dual voltage sensing. This ACR is automatic only, with a simpler two-terminal setup.

Can it handle a 210 A load continuously?

No. 210 A is a 5-minute intermittent rating. Size continuous charging and load current below that.

Is it safe in a gasoline engine compartment?

Yes. It is ignition protected and hermetically sealed, which is why it is specified for gasoline-powered boats.

What is the 90-second delay for?

It delays combining after voltage rises, preventing the relay from chattering during brief voltage swings.

Where is the Blue Sea Systems Automatic Charging Relay cheapest?

At Amazon, for $84.81, 32% under what the other stores charge, as of our latest check.

Where can I buy the Blue Sea Systems Automatic Charging Relay?

17 stores we checked sell it, including Hodges Marine, Wake Works, Bluewater Marine, TacticalWholesalers.com, Defender Marine.

Blue Sea Systems Automatic Charging Relay

Best price now

$84.81at AmazonChecked 56 min ago

32% under what the other stores charge

Compared across 17 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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