Understand what each protective device does and the information your electrician or consultant needs before specifying it.
Three different jobs
An MCB protects against overload and short circuit. An RCCB monitors leakage current. An RCBO combines overcurrent and residual-current protection in one device.
Selection is system-specific
Poles, current rating, curve, breaking capacity and leakage sensitivity must suit the circuit and design. Follow the consultant's schedule and applicable standards.
Distribution-board compatibility
Confirm module width, busbar arrangement, enclosure capacity and brand compatibility before ordering a mixed bill of materials.
What to send for a quote
Share the single-line diagram, DB schedule, quantities and preferred makes. This reduces assumptions and speeds comparison.
This article provides general procurement guidance. Final product selection should follow the project design, applicable standards and advice from a qualified electrical professional.