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Product Description
MSA-1DG Power Supply (Collection Box)
Product Introduction
This Power Supply, configured as a Central Distribution Box, is the dedicated and reliable power management hub specifically engineered for marine Watertight Door Alarm Systems. It serves as the centralized source of clean, stable, and uninterrupted electrical power for all critical components within the system, including local alarm units, status repeaters, control panels, and electromagnetic door locks.
The primary function of this unit is to ensure 100% operational readiness of the safety system under all conditions, including main power failure. It typically features a dual-power input design, automatically switching from the vessel's main AC supply to a backup battery bank (DC) without interruption. This seamless transition guarantees that the audible/visual alarms and status monitoring remain fully functional during emergencies, which is a fundamental SOLAS requirement for maintaining watertight integrity and crew safety.
Constructed with a robust, corrosion-resistant metal enclosure, the distribution box is designed for secure wall or cabinet mounting in machinery spaces or control rooms. It incorporates essential protection features such as circuit breakers or fuses for each output branch, surge protection, and clear visual indicators for power status (Mains, Battery, Fault). By consolidating and safeguarding the power distribution, this unit simplifies installation, enhances system reliability, facilitates easy maintenance, and ensures complete compliance with marine electrical standards and the stringent safety regulations governing watertight door operations.
Drawing

Technical Data
| Main Power | AC220V±10% |
| Spare Power | DC24V(+30%~-25%) |
| Environment Temperature | -10℃~+55℃ |
| Environment Humidity | ≤95% |
| Alarm Sound Pressure Level | 75dB~95dB |
| VDR Data Protol | RS485 |
Watertight Door Alarm System

Watertight Door Alarm System Connection Diagram
