Disjoncteur différentiel Et le choix d’un DDR est une décision liée aux limites de protection. Un disjoncteur différentiel combiné intègre à la fois la protection contre les courants résiduels et la protection contre les surintensités dans un seul appareil homologué. Un DDR assure uniquement la protection contre les courants résiduels, tandis qu’une protection adéquate contre les surintensités doit être assurée ailleurs. Le choix approprié dépend de la manière dont le schéma unifilaire répartit les circuits et les retours de neutre.
Mettez en correspondance les deux fonctions de protection avant de comparer les appareils.
Marquez les emplacements des surcharges et des courts-circuits.Protection du circuit sont fournis, quels circuits partagent la protection contre les courants de défaut à la terre et comment chaque neutre est raccordé. Le Route du produit RCBO Et une voie RCCB ne doit être comparée qu’une fois ces fonctions visibles sur le plan.
Quelle est la différence fonctionnelle entre un disjoncteur différentiel (RCBO) et un interrupteur différentiel (RCCB) ?
An RCBO can isolate a single outgoing circuit for both residual-current and overcurrent events when the model is designed for that duty. An RCCB can protect a group against residual current, but downstream MCBs or another verified overcurrent arrangement are still required. RCD is the broader category, so an RCD and an RCBO are not equivalent labels for purchasing.
Which circuit inputs expose the real duty split?
Record load type, rated current, neutral arrangement, residual-current type, prospective fault current, selectivity needs and the consequence of one device disconnecting several circuits. Electronic loads and variable-speed equipment may change the required residual-current waveform type.
How should the drawing keep the functions separate?
Show the overcurrent device, residual-current device, neutral bar and downstream circuit boundaries explicitly. Do not mix neutrals between independently protected RCBO circuits, and do not assume that an RCCB adds overcurrent protection.
When can individual RCBOs improve circuit subdivision?
Individual RCBOs may be useful when the design wants one circuit’s residual-current event to avoid interrupting unrelated circuits. A grouped RCCB-plus-MCB arrangement may still be suitable when the project accepts group interruption and the coordination is documented. When weighing RCBO advantages and disadvantages, compare the complete board layouts, including the space and cost of separate overcurrent devices in the RCCB option. The circuits affected by a fault matter alongside the price of each device.
What should a comparison request contain?
List the device function, rated current, poles and neutral treatment, residual-current type and sensitivity, breaking capacity, installation format, selectivity requirements and the evidence required for the target market. Keep sensitivity selection separate from the basic RCBO-versus-RCCB boundary.
Which CHAC pages can support the shortlist?
Compare the CQB3LE-63 electronic RCBO with the PXL9-63 leakage breaker only after confirming each model’s documented function and configuration.
Who owns the final protection boundary?
The responsible project designer owns the final choice. Use IEC 61008-1 et IEC 61009-1 as standards references, then verify the exact model, neutral routing, type and local installation requirements.
The schedule should name the required Protection contre le courant résiduel function and its neutral arrangement so that a supplier cannot replace an RCBO with an RCCB without exposing the missing overcurrent duty.
FAQ
Is an RCBO simply an RCCB with a different name?
No. An RCBO is reviewed when residual-current and overcurrent functions are intended in one documented device arrangement.
Can an RCCB replace an RCBO without redrawing the circuit?
Only if the approved design still provides the missing overcurrent duty elsewhere and the selected models support that arrangement.
What drawing fields matter most in the comparison?
Residual-current duty, overcurrent duty, pole/neutral arrangement, and shared downstream circuits.
What should suppliers confirm in writing?
Exact model identification plus the documents that support only the duties requested in the RFQ.
How does this differ from a sensitivity selection guide?
Sensitivity is a separate residual-current setting question; this article focuses on combined versus split device duties.
Who owns the final protection boundary?
The responsible project electrical designer owns it using the approved drawings and selected-model evidence.
