Secondary distribution box with voltage meter

A secondary distribution box with a voltage meter is a low-voltage panel that distributes electricity from a transformer to multiple circuits while monitoring voltage levels for safety and efficiency.

Overview

A secondary distribution box (also called a sub-distribution board or SDB) is part of the low-voltage network that carries electricity from distribution transformers to end-user circuits. It typically operates at 120/240V AC or 230/240V AC, depending on regional standards, and can handle single-phase or three-phase connections . These boxes are designed to safely distribute power to multiple circuits while providing protection through fuses or circuit breakers .

Key Components

1. Voltage Meter: Measures the voltage supplied to the circuits, allowing monitoring of power quality and ensuring that connected devices receive the correct voltage .
2. Circuit Breakers or Fuses: Protect individual circuits from overload or short circuits. Some boxes include branch breakers rated for specific currents, e.g., 20A per socket .
3. Bus Bars: Conduct electricity from the main input to the branch circuits.
4. Enclosure: Made from durable materials like ABS plastic or metal, often with IP54–IP65 ratings for dust and water resistance, suitable for indoor or outdoor installation .
5. Sockets or Terminals: Provide connection points for downstream circuits or equipment.

Features and Benefits

• Safety: Integrated breakers and leakage protection prevent electrical hazards.
• Monitoring: Voltage meters allow real-time monitoring of supply voltage, helping detect anomalies early.
• Flexibility: Can serve multiple circuits in residential, commercial, or industrial settings.
• Ease of Installation: Many units come pre-wired and wall-mountable, reducing installation complexity .

Applications

• Residential buildings for distributing power to apartments or rooms.
• Commercial spaces like offices or workshops.
• Industrial setups for machinery requiring monitored low-voltage supply.
• Outdoor installations near transformers or in public infrastructure for street lighting or service units .

Example Product

A typical example is a 110V power distribution box with a 60A input capacity, equipped with a multifunctional electricity meter, branch circuit breakers, and waterproof sockets. It is pre-wired for easy installation and provides both safety and monitoring features . In summary, a secondary distribution box with a voltage meter ensures safe, reliable, and monitored distribution of low-voltage electricity to multiple circuits, making it essential for both residential and industrial electrical systems .