Solenoid ML - 12 V DC

The Blue Sea Systems ML 12V DC 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 feature of the ML 7701 solenoid is that it is designed without an integrated manual control. Unlike the ML-Series remote battery switches (PN 7700/7702) which include a manual control button, the 7701 is controlled remotely only.

The ML 7701 solenoid uses a bistable magnetic latching design. This technology allows it to draw 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 3/8"-16 (M10) copper studs: Tinned copper ensures maximum conductivity and excellent corrosion resistance, essential in marine environments.Stainless steel countersunk nuts: They ensure secure, corrosion-resistant connections.

The ML 7701 solenoid is designed for long service 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 ideal 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 remotely operated by a SPDT (ON)-OFF-(ON) momentary control switch, such as Blue Sea Systems PN 2145, or by two momentary push buttons.

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

Starting current (30 seconds): 1 450A DC
Intermittent current (5 minutes): 700A DC
Continuous current (UL 1107): 500A DC

To achieve maximum performance from the solenoid, it is recommended to use:

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 the wires and connection terminals, mount it in a dry, protected location. Avoid mounting it directly above vented lead-acid batteries to prevent exposure to corrosive gases.

To connect high-current cables:

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

Yes, if you switch 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 on 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 any 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 complies with 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: Provides 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 has a dedicated LED output to remotely indicate its state (ON/OFF). The Contura remote control switch included in the retail package also features an LED for this purpose.