{"id":3466,"date":"2026-08-07T09:00:00","date_gmt":"2026-08-07T09:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/blog\/rcbo-vs-rccb-selection-boundary\/"},"modified":"2026-10-14T06:50:02","modified_gmt":"2026-10-14T06:50:02","slug":"limite-de-selecao-entre-rcbo-e-rccb","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/pt\/blog\/rcbo-vs-rccb-selection-boundary\/","title":{"rendered":"RCBO vs RCCB: Como os Montadores de Quadros Separam a Prote\u00e7\u00e3o Combinada e Dividida"},"content":{"rendered":"

Disjuntor Diferencial Residual<\/a> and RCCB selection is a protection-boundary decision. An RCBO combines residual-current and overcurrent protection in one documented device arrangement. An RCCB provides residual-current protection, while suitable overcurrent protection must be provided elsewhere. The right choice depends on how the single-line diagram divides circuits and neutral returns.<\/p>\n

\"RCBO<\/p>\n

Map the two protection functions before comparing devices<\/h2>\n

Mark where overload and short-circuit protection<\/a> are provided, which circuits share residual-current protection, and how each neutral returns. The RCBO product route<\/a><\/strong> and an RCCB route should be compared only after those functions are visible on the drawing.<\/p>\n

What is the functional difference between an RCBO and an RCCB?<\/h2>\n

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.<\/p>\n

Which circuit inputs expose the real duty split?<\/h2>\n

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.<\/p>\n

\"Disjuntor<\/p>\n

How should the drawing keep the functions separate?<\/h2>\n

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.<\/p>\n

\"Disjuntor<\/p>\n

When can individual RCBOs improve circuit subdivision?<\/h2>\n

Individual RCBOs may be useful when the design wants one circuit\u2019s 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.<\/p>\n

What should a comparison request contain?<\/h2>\n

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.<\/p>\n

Which CHAC pages can support the shortlist?<\/h2>\n

Compare the CQB3LE-63 electronic RCBO<\/a> with the PXL9-63 leakage breaker<\/a><\/strong> only after confirming each model\u2019s documented function and configuration.<\/p>\n

Quem \u00e9 o propriet\u00e1rio do limite de prote\u00e7\u00e3o final?<\/h2>\n

The responsible project designer owns the final choice. Use IEC 61008-1<\/a> e IEC 61009-1<\/a> as standards references, then verify the exact model, neutral routing, type and local installation requirements.<\/p>\n

The schedule should name the required Prote\u00e7\u00e3o contra corrente residual<\/strong> function and its neutral arrangement so that a supplier cannot replace an RCBO with an RCCB without exposing the missing overcurrent duty.<\/p>\n

FAQs<\/h2>\n

N\u00e3o, um RCBO n\u00e3o \u00e9 simplesmente um RCCB com um nome diferente. Um RCCB (Disjuntor Diferencial Residual) protege apenas contra correntes de fuga \u00e0 terra (choques el\u00e9tricos), enquanto um RCBO combina essa prote\u00e7\u00e3o com a prote\u00e7\u00e3o contra sobrecargas e curto-circuitos, funcionando essencialmente como um RCCB e um disjuntor (MCB) num \u00fanico aparelho.<\/h3>\n

N\u00e3o. Um disjuntor diferencial com protec\u00e7\u00e3o de sobrecorrente (RCBO) \u00e9 considerado quando as fun\u00e7\u00f5es de corrente residual e de sobrecorrente s\u00e3o pretendidas num \u00fanico dispositivo documentado.<\/p>\n

Pode um diferencial puro substituir um disjuntor diferencial sem redesenhar o circuito?<\/h3>\n

Apenas se o projeto aprovado ainda assegurar a capacidade de sobrecorrente em falta noutro local e os modelos selecionados suportarem essa disposi\u00e7\u00e3o.<\/p>\n

Que campos de desenho importam mais na compara\u00e7\u00e3o?<\/h3>\n

Capacidade diferencial residual, capacidade de sobrecorrente, disposi\u00e7\u00e3o de polos\/neutro e circuitos a jusante partilhados.<\/p>\n

O que devem os fornecedores confirmar por escrito?<\/h3>\n

Identifica\u00e7\u00e3o exata do modelo mais os documentos que suportam apenas as fun\u00e7\u00f5es solicitadas no RFQ.<\/p>\n

Em que \u00e9 que isto difere de um guia de sele\u00e7\u00e3o de sensibilidade?<\/h3>\n

A sensibilidade \u00e9 uma quest\u00e3o separada de regula\u00e7\u00e3o de corrente residual; este artigo foca-se nas fun\u00e7\u00f5es dos dispositivos combinados em compara\u00e7\u00e3o com os separados.<\/p>\n

Quem \u00e9 o propriet\u00e1rio do limite de prote\u00e7\u00e3o final?<\/h3>\n

O projetista el\u00e9trico respons\u00e1vel pelo projeto assume a titularidade do mesmo utilizando os desenhos aprovados e a evid\u00eancia do modelo selecionado.<\/p>\n

Refer\u00eancias<\/h2>\n