Overview

The Blue Sea Systems 7615 is a 12V DC automatic timer disconnect that can also be set up as a low-voltage disconnect, an automatic charging relay, or a signal-controlled solenoid. It is rated for 120A continuous duty and 210A intermittent duty for 5 minutes, with selectable disconnect delays of 15 minutes, 30 minutes, 1 hour, 1.5 hours, 2 hours, or 4 hours and low-voltage trip points at 11.0V, 11.5V, or 12.0V.

This makes it useful when you want a circuit to stay live for a short period after a key switch or control signal is turned off, or when you want non-critical DC loads to drop before the battery is drawn down too far. On board, that can help with house accessories, electronics, or other loads that should not keep pulling from the battery after the engine is shut down.

Key features

• 12V DC unit with 120A continuous rating and 210A intermittent rating for 5 minutes
• Can be configured as a timer disconnect, low-voltage disconnect, automatic charging relay, or solenoid
• Selectable disconnect delays of 15 minutes, 30 minutes, 1 hour, 1.5 hours, 2 hours, or 4 hours
• Selectable low-voltage disconnect points at 11.0V, 11.5V, and 12.0V
• Charge-sense thresholds of 13.0V to connect and 12.75V to disconnect in relay mode
• Sealed to IP67 for mounting in spaces that may see spray or washdowns
• 3/8"-16 (M10) tinned copper studs accept cable up to 1/0 AWG
• LED status indicator and insulated cover help with setup and service checks

Installation and setup

This unit is built for 12V systems and works across a 9.5V to 16V input range. It uses 3/8"-16 (M10) studs and is sized for 1 AWG cable to meet its current rating, with room for cable up to 1/0 AWG. In a typical installation it is placed between the battery and the load side you want controlled, then triggered by a 12V signal or by charge sense depending on how the switch settings are configured.

The insulated terminal cover helps protect the connections once the wiring is complete, which matters in battery compartments and other tight service spaces where accidental contact is a real concern. The LED indicator gives a quick visual check of operating status without needing to pull the wiring apart.

Compatibility and fit

It is built for 12V DC only, so it should be matched to a 12V house bank, start battery, or control circuit. The sealed body suits locations that may see spray, washdowns, or persistent moisture, provided the cable terminations and mounting are done properly.

It suits boats that need timed load shedding, low-voltage battery protection, or automatic battery combining in a 12V charging setup. That can make sense for small cruisers, fishing boats, and workboats where house accessories or other non-critical loads need to disconnect automatically instead of being left on until the battery is flat.