ElectraSim App Updates
Release notes and practical introductions to recently added tools.
Electrical Guides and Articles
Clear explanations of wiring, components, regulations, and electrical safety.
Distribution Board Explained: How a Consumer Unit is Wired
The distribution board is the heart of every electrical installation. This guide explains what's inside a consumer unit, how it distributes power to every circuit in a building, and how to simulate a multi-circuit distribution board using a free electrical circuit simulator.
What is a Contactor and How Does It Work?
A contactor is an electrically controlled switch built for high-power loads. This guide explains how contactors work, where they're used, how they differ from relays and MCBs, and how to simulate a contactor circuit in a free electrical circuit simulator.
What is an RCD and Why Do You Need One?
An RCD can disconnect a dangerous earth fault fast enough to save your life. This guide explains exactly how Residual Current Devices work, why they're mandatory in modern wiring, and how to test RCD protection safely using a free electrical circuit simulator.
Getting Started with ElectraSim: Build and Simulate Your First Circuit in 5 Minutes
New to ElectraSim? This step-by-step guide shows you how to place components, draw wires, run a simulation, and read the fault log — all in your browser, for free.
What is an MCB Breaker and How Does It Protect Your Circuit?
MCBs are the first line of defence against overloads and short circuits. This guide explains exactly how they work, why they trip, and how to use a free electrical simulator to test MCB behaviour safely.
Series vs Parallel Circuits: What's the Difference and Which One Should You Use?
Series and parallel circuits behave completely differently — and knowing which to use could save your appliances (or your life). This guide explains both with clear examples you can simulate for free.
How Household Wiring Works: A Complete Beginner's Guide
Learn how household electrical wiring works — from the main circuit breaker panel to your light switch. Understand live, neutral and earth wires, how MCBs protect your home, and what causes common faults.