MCB vs RCBO vs RCD vs RCCB: Key Differences
MCB, RCD (RCCB) and RCBO protect against different faults. This compares what each detects, the 30 mA vs 300 mA sensitivity split, and how Vigi or DS201 add-ons combine them.
9 min read
Technical
RCD guides
Guides and notes on industrial electrical and automation parts: selection, wiring, settings and ordering.
- Articles
- 33
RCD Types AC, A, F, B and SI Explained
A breakdown of RCD Types AC, A, F, B and SI: the waveform each detects, why Type AC is now restricted, and how to size Type B for VFDs, EV...
9 min read
RCD Sensitivity: 10mA, 30mA, 100mA and 300mA Explained
A breakdown of RCD sensitivity ratings (IΔn) from 10 mA to 300 mA, covering personal versus fire protection, earth electrode sizing, and how to choose the right threshold for a...
11 min read
How an RCD Detects Earth Leakage: Toroidal Core Principle
How an RCD's toroidal core sums line and neutral current to sense earth leakage and trip in milliseconds.
10 min read
ELCB vs RCD vs GFCI: Terminology Explained
ELCB, RCD, and GFCI describe the same protective function in different eras and regions, and knowing which term applies to your panel avoids costly spec mismatches.
10 min read
Main Components of an RCD: Toroidal Core and Test Button
A component-by-component breakdown of what is physically inside an RCD, RCCB and RCBO, from the toroidal sensing core to the test button circuit.
10 min read
Types of RCDs: Sensitivity and Construction Explained
A practical breakdown of RCD sensitivity (IΔn) and construction type (AC/A/F/B/SI) so panel builders and engineers specify the right device for the load.
9 min read
What Is an RCD and How Does It Work
An RCD trips by sensing the imbalance between line and neutral current through a toroidal core, and this guide covers that principle, IDn sensitivity, RCD/RCCB/RCBO terminology, earthing systems, and field...
9 min read
Residual Current Device Engineering Guide (RCD, RCCB, RCBO)
A complete engineering guide to RCD, RCCB and RCBO protection covering sensitivity classes, waveform types, earthing systems, selectivity, EV/PV/VFD applications and Schneider, ABB and Siemens brand comparisons.
21 min read
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