combined breakers
Combined protection devices: compact devices that combine several protection functions in one modular solution.
- Integration: several protection functions in one device.
- RCBO: combined MCB and residual current protection.
- Surge: not declared for S24ROA251130; dedicated protection is required.
- Space: compact solution for modular DIN boards.
Combined protection: residual current and overcurrent protection in an RCBO
Combined protective devices integrate different functions in one unit. Solera S24ROA251130, the reference published in this category, is an RCBO: it combines residual current protection with thermal-magnetic protection against overloads and short circuits. It is intended for AC circuits in indoor residential, office and commercial installations, selected according to the circuit conditions.
S24ROA251130 specifications
| Characteristic | Value |
|---|---|
| Configuration | 1P+N |
| Rated current | 25 A |
| Rated residual operating current IΔn | 30 mA |
| RCD type | Type A |
| Overcurrent trip curve | C |
| Breaking capacity | 6 kA |
| Voltage and frequency | 230 V AC, 50/60 Hz |
| Modular width | 2 modules of 18 mm |
Applications and selection criteria
Consider this solution where a circuit needs residual current and overcurrent protection in a two-module assembly. A separate MCB does not provide residual current protection, while an RCD without integral overcurrent protection does not perform the MCB function. RCBO identifies the integration of both functions, without establishing additional protective functions.
Check that 25 A suits the load and conductor, that 30 mA sensitivity and Type A meet the protection requirements, and that 6 kA breaking capacity is sufficient for the prospective short-circuit current. Type A detects sinusoidal AC and pulsating DC residual currents; suitability for every electronic appliance must not be assumed.
The specification states 35 mm DIN-rail mounting, a right-hand neutral and provision for pin-type busbar connections. Check pitch, arrangement, current rating and compatibility of the actual busbar. Follow the instructions for mounting and maintenance of the residual current function; a common modular format does not establish universal compatibility.
Frequently asked questions
Does A/C mean that the RCD is Type AC?
Not for this reference. The S24ROA251130 specification declares Type A residual current detection and curve C overcurrent protection. These are separate characteristics; the abbreviation A/C must not be read as Type AC.
Does it include sustained or transient overvoltage protection?
The specification declares residual current and overcurrent functions, not overvoltage protection. Where that function is needed, select and coordinate a dedicated protective device or an assembly that expressly includes it.
What is the difference between 25 A, 30 mA and 6 kA?
25 A is the rated current; 30 mA is the rated residual operating current; 6 kA is the declared short-circuit breaking capacity. These values are not interchangeable and must be checked separately when selecting the device.