Select protection around the actual circuit and fault requirements. Residual-current and overcurrent protection are different functions; device types, ratings, coordination and installation tests are checked by qualified personnel.
Conceptual RCCB / RCBO / MCB / MCCB product and system illustration for Protection. Final device form, model, interfaces and quantities are confirmed from the assessed scope and approved product data. Conceptual supply, protect and verify path for RCCB / RCBO / MCB / MCCB, derived from this page's scope, interfaces and acceptance record.
Conceptual planning path — not an as-built drawing or project photograph.
Select protection around the actual circuit and fault requirements. Residual-current and overcurrent protection are different functions; device types, ratings, coordination and installation tests are checked by qualified personnel.
It sits in Electrical Protection under Protection. The final deliverable is shaped by the intended outcome, the installed or proposed environment and the interfaces that must be owned, supplied, integrated and tested.
Select protection around the actual circuit and fault requirements. Residual-current and overcurrent protection are different functions; device types, ratings, coordination and installation tests are checked by qualified personnel. Confirm circuits and loads, supply and earthing arrangement, fault requirements, residual-current needs, existing devices, coordination, manufacturer guidance and the agreed inspection and test scope.
From the initial brief to the handover record: what to prepare, check and confirm with HJ.
Define Protection as the operating result for RCCB / RCBO / MCB / MCCB, including the users, process and exceptions it must serve.
Select protection around the actual circuit and fault requirements. Residual-current and overcurrent protection are different functions; device types, ratings, coordination and installation tests are checked by qualified personnel.
For RCCB / RCBO / MCB / MCCB, confirm system voltage, phase and load, fault characteristics and earthing, selectivity, surge exposure and isolation responsibility.
Confirm circuits and loads, supply and earthing arrangement, fault requirements, residual-current needs, existing devices, coordination, manufacturer guidance and the agreed inspection and test scope.
Map Supply or source → Isolation & protection → Distribution or containment → Load & test record for RCCB / RCBO / MCB / MCCB and identify every interface owned by HJ, the customer, ISD supply or an appointed specialist.
Device ratings and type must follow calculated circuit conditions and applicable rules; adding protection does not correct defective wiring or earthing. Final models, capacities and quantities still follow survey, compatibility and availability.
An RCCB does not include overcurrent protection by default; an RCBO combines residual-current and overcurrent functions. MCB or MCCB selection does not automatically supply residual-current protection; the complete circuit design must be verified.
For RCCB / RCBO / MCB / MCCB, record rating and label verification, applicable trip and function tests, coordination, isolation and signed record; also agree protection and isolation checks, load or functional test, label, drawing and responsible-person record before handover.
Retain the circuit schedule, qualified inspection and agreed test results, device identity and settings, exceptions and authorisation before energisation or return to service.
HJ coordinates assessment, engineering, installation, integration, testing and lifecycle support only for the scope recorded in the quotation. ISD handles catalogue, model, datasheet, supply and availability enquiries. Customer, consultant, builder and appointed-specialist responsibilities remain explicit.
Regulated or multi-discipline work proceeds only after site assessment and confirmation of the competent, qualified or appointed persons, approvals, safe isolation and responsibility required for that scope.
This focused topic remains connected to its complete system owner. Final models, quantities, interfaces and included work are confirmed in the assessed quotation.
See related systems, how HJ installs them, and support for equipment you already have.
Use the answers as a planning boundary; site conditions and written scope remain decisive.
Confirm circuits and loads, supply and earthing arrangement, fault requirements, residual-current needs, existing devices, coordination, manufacturer guidance and the agreed inspection and test scope.
An RCCB does not include overcurrent protection by default; an RCBO combines residual-current and overcurrent functions. MCB or MCCB selection does not automatically supply residual-current protection; the complete circuit design must be verified.
Retain the circuit schedule, qualified inspection and agreed test results, device identity and settings, exceptions and authorisation before energisation or return to service.
Tell us where it will be used, what it needs to do and what equipment you already have. HJ will recommend the right system, explain who is responsible for what, and agree the next step with you.