Electrical decoder
RCD / RCBO Marking Decoder
Decode RCD, RCCB, and RCBO residual-current type, sensitivity, current, curve, and kA markings.
Inputs
Results
- Decoded result
- Waiting for input
- Confidence
- Waiting for input
Segment breakdown
Matched fields
Use the decoder above to read an RCD, RCCB, or RCBO marking. Enter the full visible string: device family, residual-current type, sensitivity in mA, rated current, curve, and kA. The tool keeps overcurrent fields separate from residual-current fields.
Reference Table
| Input | Decoded result |
|---|---|
| RCD Type A 30mA | Residual-current device, type A waveform, 30 mA trip sensitivity |
| RCBO C16 Type A 30mA 6kA | RCBO with C16 overcurrent, type A, 30 mA sensitivity, 6 kA rating |
Code Structure
| Segment | Meaning |
|---|---|
| Family (RCD, RCCB, RCBO) | RCBO adds overcurrent protection; RCD/RCCB is residual-current only. |
| Type (AC, A, F, B) | Residual-current waveform the device detects. |
| Sensitivity (30mA) | Rated residual operating current, not the load current. |
| Curve + current (C16) | RCBO overcurrent characteristic and rating. |
| kA rating | Short-circuit breaking capacity. |
How To Decode
- Enter the marking exactly as printed, keeping family, type letter, mA, current, and kA together.
- Read residual-current fields (type, mA) separately from overcurrent fields (curve, amps).
- Confirm selectivity, wiring rules, and device data sheet before any protection decision.
Sources And Limits
IEC residual-current protective device families and manufacturer RCBO/RCCB marking guides; verified 2026-08-26. This decoder reads the visible marking only — it never confirms shock protection, selectivity, or installation compliance.
Decode logic
- Read the device family first: RCD/RCCB for residual-current only, RCBO when overcurrent protection (curve plus amps) is also printed.
- Read the residual-current type letter (AC, A, F, B) and the sensitivity in mA as the residual domain, separate from any overcurrent fields.
- For RCBO markings, read the curve letter plus rated current and the kA interrupt marking as the overcurrent domain.
- Keep selectivity, wiring rules, and device data sheet checks outside this decoder; use the output as a marking reading aid only.
FAQs
What is the difference between Type A and Type AC?
Type AC covers alternating residual currents while Type A additionally covers pulsating DC components. Check the device data sheet for the exact tripping behavior.
What does 30mA mean on an RCD?
30mA is the rated residual operating current (sensitivity) printed on the device. It does not by itself confirm shock protection, selectivity, or installation compliance.
Is the C16 in an RCBO the same as in an MCB?
The C curve and 16 A rated current read the same way, but an RCBO also carries residual-current fields (type, mA). Read both domains before comparing devices.
What does the 6kA marking mean?
6kA is the short-circuit interrupt marking printed on the device. Confirm breaking capacity, selectivity, and wiring rules against the data sheet.