An electrical distribution board also known as a panelboard, breaker panel, or DB box is a fundamental component of modern electrical systems. It divides incoming electrical power into subordinate circuits while providing protective devices and centralized control. This article explores its main components, auxiliary elements, and what Sell‑Best offers for such systems.
Main Components of a Distribution Board
a. Main Switch
The main switch, often referred to as the “incomer,” serves as the primary isolation point for the entire distribution board. It allows operators to disconnect all outgoing circuits for maintenance or emergency shutdowns. In commercial and industrial settings, this switch is commonly a heavy-duty, high-current capable breaker or isolator.
b. Circuit Breakers
Individual circuit breakers are the core protective elements. They respond to overcurrent and short‑circuit conditions and can be reset manually post‑trip. In modern systems, breakers are often mounted on standard DIN rails, streamlining installation and replacement.
c. Residual Current Devices (RCDs) / RCBOs
RCDs (Residual Current Devices) protect against earth faults by monitoring imbalance between live and neutral conductors. If leakage current exceeds a threshold, these devices trip to prevent electrocution or fire. RCBOs combine both overcurrent protection and residual current protection in one device, offering compact yet comprehensive safety.
d. Busbars
Busbars are metallic conductors, typically copper or aluminum that distribute electrical power within the board. Incoming power is received by busbars and then fed to individual breakers or RCDs. Their robustness ensures reliable power distribution and simplifies the board’s internal layout.
Auxiliary components of distribution board
a. Electrical Enclosure
The board’s enclosure provides mechanical protection and touch-safe isolation. It can be constructed from sheet metal or impact-resistant polymer, with ingress protection ratings such as IP2X to guard against dust or accidental contact. In North America, such panels feature a “dead front” to prevent exposure to live parts.
b. Terminal Blocks
Terminal blocks also referred to as neutral or earth bars—provide secure connection points for conductors. They ensure clean wiring, reliable contact, and simplified maintenance. These are crucial for grounding and safe return paths in an electrical installation.
c. Indicators & Meters
Many distribution boards include visual indicators (LEDs) or meters to display operational status, load currents, voltage levels, or alarm conditions. These help technicians with real-time diagnostics and energy monitoring—vital in both industrial and commercial environments.
Sell‑Best: Reliable Components for Distribution Boards
Sell‑Best specializes in supplying key components for low-voltage distribution systems. We offer reliable and efficient parts for distribution boards, supporting safe and intelligent power management across industrial, commercial, and residential applications.
Our product range includes high-quality terminal blocks for secure wire connections, accurate single-phase and three-phase energy meters for monitoring power usage, and a variety of indicator lights for circuit and power status display. All components are tested to meet IEC standards and ensure long-term performance.
Sell‑Best also provides customization, bulk supply, and technical support to meet your specific project needs. Contact us to learn more about our solutions.
