The DC Distribution Box (DCDB) is an essential safety device in a solar PV system that combines DC power from multiple solar strings and provides protection against overcurrent and surges before feeding the power to the inverter.

This 3-in/3-out DCDB is ideal for medium-scale rooftop solar installations in the 21–30 kW range, offering reliability, easy maintenance, and compliance with MNRE and DISCOM standards.

Key Components Included

1. DC SPD – 1000V (2 Nos.)

   • Provides surge protection from lightning strikes and transient overvoltages.

   • Type 2 SPD, specifically designed for solar photovoltaic applications.

2. DC Fuse – 20A, 1000V (3 Nos.)

   • Individual string protection to prevent overcurrent damage.

   • Isolates faulty strings to keep the rest of the system operational.

3. Terminal Blocks / MC4 Connectors (Optional)

   • For safe, secure, and easy cable connections.

   • Simplifies installation and routine maintenance.

4. Heavy-Duty Enclosure

   • Weatherproof, IP65-rated to withstand dust, rain, and UV exposure.

   • Rugged, powder-coated finish for long-lasting outdoor performance.

Functional Flow

• 3 Solar Inputs → Pass through DC Fuses (20A, 1000V) →

• Combined power protected via DC SPDs (2 Nos.) →

• 3 Safe Outputs connected to the solar inverter.

Applications

• Residential and Commercial Rooftop Solar Plants (21–30 kW)

• Institutional Solar Installations

• Hybrid Solar Systems with net metering

• Small-scale ground-mounted solar plants