Solenoid ML - 12 V DC

The Blue Sea Systems 12V DC ML solenoid (PN 7701) is a latching magnetic switch designed for remote power circuit management. It allows switching high loads without requiring direct manual control of the device, making it ideal for installations where physical access is limited or unnecessary.

The main specific feature of the ML 7701 solenoid is that it is designed without an integrated manual control. Unlike the remote battery switches in the ML-Series (PN 7700/7702) which include a manual control button, the 7701 is controlled solely remotely.

The ML 7701 solenoid uses a bi-stable magnetic latching design. This technology allows it to consume no continuous current (0 mA) once it is in the ON or OFF position. It only draws power (less than 7A for 20 ms) during state changes (activation or deactivation).

The ML 7701 solenoid is equipped with:

Silver alloy contacts: They provide high reliability for switching loads under voltage.Tinned copper studs 3/8"-16 (M10): The tinned copper ensures maximum conductivity and excellent corrosion resistance, essential in marine environments.Stainless steel flange nuts: They guarantee secure and corrosion-resistant connections.

The ML 7701 solenoid is designed for long life with:

100,000 mechanical switching cycles: For long-term reliability. 10,000 load switching cycles: At 12V and 300A. 10,000 load switching cycles: At 24V and 150A. 2,000 load switching cycles: At 48V and 100A.

Yes, the ML 7701 solenoid is designed to withstand demanding marine environments. It has an IP66 rating, ensuring protection against powerful water jets. Its tinned copper studs and stainless steel nuts provide excellent corrosion resistance.

The operating voltage range for the ML 7701 solenoid contacts is 0 to 64V DC. This makes it compatible with multi-voltage systems, including nominal 12V, 24V, 36V, and 48V DC systems.

Yes, although the nominal control voltage is 12V DC, the ML 7701 solenoid is rated for a contact voltage of 0 to 64V DC. This makes it suitable for use in nominal 36V DC and 48V DC systems, as well as in multi-voltage systems such as solar applications or golf carts.

The ML 7701 solenoid is operated remotely via a SPDT (ON)-OFF-(ON) momentary control switch, such as Blue Sea Systems PN 2145, or via two momentary pushbuttons.

The ML 7701 solenoid provides the following current ratings when connected with two 4/0 AWG cables (2x 120 mm²):

Starting current (30 seconds): 1,450A DCCIntermittent current (5 minutes): 700A DCCContinuous current (UL 1107): 500A DC

To achieve the solenoid's maximum performance, use the following cable sizes:

2/0 AWG (70 mm²): 1 000A (30s start), 400A (5min intermittent), 225A (continuous). 4/0 AWG (120 mm²): 1 100A (30s start), 400A (5min intermittent), 300A (continuous). 2x 4/0 AWG (2x 120 mm²): 1 450A (30s start), 700A (5min intermittent), 500A (continuous).

The solenoid should be installed as close as possible to the battery. To prevent corrosion of wires and connection terminals, mount it in a dry and protected location. Avoid mounting it directly above vented lead-acid batteries to prevent exposure to corrosive gases.

To connect high-current circuit cables:

Connect the battery bank to one of the stud terminals marked A or B.Connect the load to the other stud terminal marked B or A.Tighten the high-current stud terminal nuts to a maximum torque of 140 in-lbs (15.8 N•m).Note that stud terminals A and B are interchangeable.

Yes, if you are switching devices such as an inverter, windlass, or bow thruster, the circuit cables must be protected in accordance with ABYC guidelines. However, cables used for engine starting typically do not require circuit protection.

The maximum recommended torque for the nuts of the solenoid terminal studs is 140 in-lbs (15.8 N•m).

Before starting the installation, it is imperative to disconnect all negative battery connections. Additionally, all unused control wires must be carefully isolated from each other and from accidental contact, for example using heat-shrink tubing or insulating tape, to prevent malfunctions.

Yes, the ML 7701 solenoid meets external ignition protection requirements per ISO 8846 and SAE J1171 standards. It is also CE marked.

The ML 7701 solenoid meets several regulatory standards, including:

ISO 8846: For protection against external ignition.SAE J1171: Also for protection against external ignition.CE marking: Indicates compliance with European Union standards.IP66: Confirms protection against powerful water jets.

Yes, the ML 7701 solenoid is supplied with a Contura remote control switch in its retail packaging. This switch allows remote control of the solenoid.

Yes, the ML 7701 solenoid features a remote LED output to indicate its state (ON/OFF). The Contura remote control switch included in the retail package has an LED for this function.