MOS Low-Side Switch Board 30A

Engineered for subsea power distribution systems, the MOS Low-Side Switch Board provides high-current switching on the negative (low) side of the circuit. It is ideal for controlling lights, thrusters, solenoids, and other underwater loads where power is distributed centrally and switched locally using remote input signals.

The board accepts logic-level control signals, including PWM, and is designed specifically for use with self-locking (latching) switches. It is not compatible with momentary or self-resetting switch types. Supported Blu-Sub switches include:

• Subsea M10 Rotary On/Off Switch
• Subsea M8 Rotary On/Off Switch
• Subsea M10 Rotary Waveband Switch
• Subsea M10 Pressure Trigger Switch (Conditionally Compatible)

Note: The Pressure Trigger Switch becomes compatible once the device is submerged to its trigger depth, where it automatically latches closed. While the switch can also be used in shallow water, manual pressing (momentary activation) is not compatible with this board and will not trigger switching.

Internally, a low-resistance MOSFET mirrors the input signal to reliably control current flow through the connected load. The circuit board includes a replaceable fuse seat to match the selected load current (15A, 30A, or 120A), providing safety and flexibility for various underwater applications.