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RCBO Combined MCB and RCD Protection | 6A-40A | 30mA | Single Module Width
Electrical Circuit Protection-RCBO
KRIPAL manufactures residual current circuit breakers with overcurrent protection (RCBOs) in the UKR7 series, combining the functions of an MCB and an RCCB in a single modular device. An RCBO protects a single final circuit against overload, short-circuit and earth leakage simultaneously, providing complete circuit protection in one 2-module (36mm) wide unit. Available with rated currents from 6A to 40A, earth leakage sensitivities of 10mA, 30mA, 100mA and 300mA, breaking capacities of 6kA or 10kA, and trip curves of B and C, the UKR7 RCBO complies with IEC/EN 61009-1 for RCBOs. The 1P+N configuration switches both the line and neutral conductors, providing isolation of both poles on a trip. KRIPAL RCBOs feature a test button for periodic verification of the earth leakage trip function and a fault indicator window that shows red when the device has tripped on earth leakage (as opposed to overcurrent), allowing the electrician to distinguish between an overload trip and an earth leakage trip during fault-finding. Type A (pulsating DC sensitive) RCBOs are standard, suitable for circuits with electronic loads including LED lighting, computer equipment and domestic appliances with inverter drives.
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UKL2-63 RCBO 1P+N C63 30mA Residual Current Breaker with Overcurrent protection
The UKL2-63 RCBO (Residual Current Operated Circuit-Breaker with Overcurrent protection) is a highly efficient and compact electrical safety device.
Ask a QuoteRCBO Protection: Three Safety Functions in One Device
An RCBO combines overcurrent protection (the MCB function) and earth leakage protection (the RCD function) in one device, protecting a single final circuit against all three fault types. Compared to using a separate MCB and RCCB, the RCBO approach provides per-circuit earth leakage protection, so an earth fault on one circuit only disconnects that circuit, not the entire installation. This per-circuit selectivity is required by IEC 60364 for installations where continuity of supply is important (commercial buildings, data centers, medical facilities) and is increasingly adopted in domestic installations under Amendment 2 of BS 7671:2018 which mandates individual RCBO protection for all socket outlet circuits. This selection guide covers current rating, sensitivity, trip curve and breaking capacity to match your circuit protection requirements.
UKR7 RCBO Series Technical Specifications
RCBO vs Separate MCB+RCCB: Selection Rationale
The choice between a single RCBO and a separate MCB plus RCCB depends on the discrimination requirement. An RCBO provides per-circuit earth leakage protection: if an appliance on circuit 1 develops an earth fault, only the RCBO for circuit 1 trips, leaving all other circuits energized. With a shared RCCB protecting multiple MCBs, the same fault disconnects all circuits downstream of the RCCB, causing a wider power outage. The RCBO approach uses slightly more DIN-rail space per circuit (2 modules for an RCBO vs 2 modules for an MCB plus 2 modules for an RCCB shared across 8-12 circuits), but the difference is approximately 0.5 modules per circuit, and the improved discrimination more than justifies this for commercial and high-end residential installations where unwanted power loss has financial or safety consequences.
Earth Leakage Sensitivity and Standing Leakage
The 30mA RCBO is the standard choice for personal protection on socket outlet circuits, providing fibrillation protection per IEC 60479-1. However, circuits with electronic equipment may have a standing leakage current from multiple items (approximately 0.5-1.5mA per desktop computer, 0.2-0.5mA per LED luminaire). A circuit with 10 desktop computers could have a standing leakage of 15mA, which is 50 percent of the 30mA trip threshold and risks nuisance tripping when an additional appliance is connected. For such circuits, the installation should be designed with more circuits (each with fewer loads) to keep the standing leakage below 30 percent of the RCBO sensitivity (9mA for a 30mA RCBO). Alternatively, a 100mA RCBO with 30mA supplementary protection at the socket outlet provides fire protection at the circuit level with personal protection at the point of use.
Trip Curve and Overcurrent Protection Coordination
The UKR7 RCBO overcurrent protection follows the same B-curve (3-5 In) and C-curve (5-10 In) characteristics as standalone MCBs. B-curve RCBOs are used for domestic socket outlet and lighting circuits where inrush current is minimal. C-curve RCBOs are specified for circuits with electronic loads, small motors or LED driver banks where the cumulative inrush from multiple devices may exceed 5 In for the first few milliseconds. The overcurrent protection is independent of the earth leakage protection: an overload that reaches 1.45 In will trip the thermal element even if the earth leakage current remains below the RCBO sensitivity, and a short-circuit of 5+ In will trip the magnetic element within 0.1 second. The RCBO’s breaking capacity (6kA or 10kA) is the same for both overcurrent and earth leakage fault clearing.
Fault Indication and Troubleshooting
The UKR7 RCBO includes a fault indicator window that shows a red flag when the device has tripped on earth leakage (as opposed to a white or blank window for an overcurrent trip). This visual indication allows the electrician to immediately distinguish between an overload (too many appliances on the circuit) and an earth fault (damaged cable insulation, water ingress in an outdoor socket, or a faulty appliance). On an RCBO without this feature, the electrician must unplug all appliances, reset the RCBO, and reconnect appliances one by one to identify the source of the earth leakage, a time-consuming process that can take 30-60 minutes for a kitchen ring main with 15-20 appliances. The fault indicator reduces this troubleshooting to a targeted insulation resistance test on the circuit wiring and a portable appliance test on the connected equipment.
Specify RCBOs for Per-Circuit Protection
- RCBO Schedule: Provide your circuit schedule and we recommend the RCBO rating, curve and sensitivity for each circuit, optimized for discrimination and standing leakage tolerance.
- Consumer Unit Layout Support: Request a DIN-rail space calculation showing how your complete circuit complement fits within a standard consumer unit enclosure.
- Volume OEM Pricing: Contractor packs of 10 RCBOs in mixed ratings with a carrying case for electricians installing multiple consumer units per week.
Per-Circuit Safety for Modern Residential and Commercial Installations
KRIPAL UKR7 RCBOs provide per-circuit complete protection in distribution boards where discrimination between circuits is required. From residential consumer units in new-build homes to commercial office distribution boards and critical infrastructure panels, the RCBO approach ensures that a fault on one circuit does not interrupt power to healthy circuits.
New-Build Residential Consumer Unit
Modern new-build homes in the UK under BS 7671 Amendment 2 are typically wired with individual RCBOs for every circuit: 6A B-curve 30mA for lighting, 16A B-curve 30mA for immersion heater, 32A B-curve 30mA for ring-main socket outlets, 32A C-curve 30mA for induction hob, and 40A B-curve 30mA for electric vehicle charger. This configuration means that a kettle developing an earth fault trips only the kitchen ring-main RCBO, not the entire consumer unit, leaving the lighting, heating and other socket circuits operational. The electrician can install the complete set of 12-16 RCBOs on a single DIN-rail within a standard 18-module consumer unit, with the RCBOs fed from a 100A main switch (no upstream RCCB required because each circuit has its own earth leakage protection).
Commercial Office Floor Distribution Board
A commercial office floor distribution board uses UKR7 RCBOs on all socket outlet and workstation circuits: 20A C-curve 30mA for a row of 8 workstations, 16A C-curve 30mA for server room rack PDUs, and 10A B-curve 30mA for general lighting. The per-circuit earth leakage protection means that an IT technician accidentally cutting through a flexible power cord under a desk trips only that row’s RCBO, not the entire floor, allowing 90 percent of the office workforce to continue working while the fault is repaired. The fault indicator on each RCBO allows the facilities electrician to quickly identify whether the trip was caused by an earth fault (red indicator) or an overload (white indicator), directing the troubleshooting effort accordingly.
Medical IT System Panel Protection
Medical locations (hospitals, clinics) use UKR7 RCBOs in the distribution panels serving patient areas, where IEC 60364-7-710 requires per-circuit earth leakage protection with a maximum 30mA sensitivity for socket outlets in Group 2 medical locations (operating theaters, intensive care units). The RCBO approach is mandatory here because a single earth fault must not disconnect life-support equipment on a different circuit, a risk that exists with a shared upstream RCCB. The RCBOs are tested monthly as part of the hospital’s electrical safety protocol, with the test results recorded in the medical equipment logbook per the hospital’s ISO 13485 quality management system.
EV Charger Dedicated Circuit Protection
A dedicated circuit for a 7.4 kW EV home charger uses a UKR7 40A B-curve 30mA Type A RCBO, providing overcurrent and earth leakage protection in one device without requiring a separate RCCB in the consumer unit. The Type A sensitivity to pulsating DC is required because the EV charger’s power electronics can generate DC leakage currents up to 6mA that would desensitize a Type AC RCD. The RCBO must be backed up by a Type A or Type B RCD at the consumer unit incoming only if the RCBO’s breaking capacity is insufficient for the prospective fault current at the consumer unit incomer, which is typically not the case for a domestic installation with a 6kA RCBO and a fault current below 2kA.
Marina and Caravan Park Supply Pillar
Outdoor supply pillars at marinas and caravan parks use UKR7 RCBOs for each berth or pitch supply socket, typically 16A C-curve 30mA for a caravan pitch and 32A C-curve 30mA for a yacht shore power connection. The per-berth RCBO arrangement means that a boat with a faulty shore power inlet (a common problem due to saltwater corrosion of the connector pins) trips only that berth’s RCBO, not the entire pontoon, allowing other boat owners to maintain their shore power connection for battery charging and dehumidifier operation. The RCBOs are installed in IP65 enclosures with lockable transparent doors that allow visual inspection of the RCBO status without opening the enclosure.
Protect Every Circuit with RCBOs
- Complete Circuit Protection Scheme: Our engineers design a full RCBO schedule from your circuit list, ensuring every circuit has the correct overcurrent and leakage protection.
- IEC 61009-1 Test Reports: Obtain certification documents for your consumer unit or distribution board compliance package.
- Electrician Bulk Packs: Order mixed-rating RCBO packs of 10 for consumer unit replacement work, with a reusable carrying case and rating identification labels.
KRIPAL RCBO Manufacturing: Integrated Protection from Automated Production
KRIPAL RCBOs are manufactured on a combined assembly line where both the MCB thermal-magnetic trip mechanism and the RCD earth leakage detection module are integrated into a single compact housing. Each RCBO undergoes combined overcurrent and residual current trip testing before shipment to global residential and light commercial electrical installation markets.
Integrated MCB and RCD Module Assembly
The thermal-magnetic MCB mechanism and the RCD summation transformer with trip relay are assembled into a single housing on a dedicated production cell. The mechanical interface between the MCB toggle mechanism and the RCD trip relay is verified for positive tripping in all fault conditions: overload, short-circuit, and earth leakage.
Combined Protection Function Testing
Every RCBO undergoes three sequential automated tests: a 1-pole overcurrent calibration at 1.45 times rated current, an instantaneous magnetic trip test at the specified B or C curve threshold, and a residual current trip test at the rated I-delta-n (30mA). All three test results are recorded against the unit serial number.
Switched Neutral Pole Synchronization
For 1P plus N RCBOs, the switched neutral pole closing and opening timing relative to the phase pole is verified on sample units from each production batch. Contact synchronization within 2ms ensures that the neutral conductor is never left floating during switching operations, preventing potential overvoltage damage to connected equipment.
Compact Housing Molding and Assembly
RCBO housings are injection-molded from flame-retardant thermoplastic (UL94 V-0 rated) in a single-module width. The DIN-rail mounting clip and terminal screw torque are verified on sample units from each molding batch to ensure secure mounting and consistent terminal clamping force across production.
Distributor Stock Holding Programs for RCBOs
KRIPAL supports distributor inventory programs with agreed stock levels for standard RCBO models from 6A to 40A with 30mA sensitivity. Shipments are planned based on demand data, with scheduled replenishment to maintain stable supply and consistent fill rates.
Private Label and OEM Branding for RCBOs
Laser-marked part numbers aligned with your catalog, OEM-branded packaging, and customized multilingual instruction sheets are available. Unbranded supply is provided upon request for private label production of RCBOs.
Multi-Region Certification and Compliance Support
CE, UKCA, and IEC 61009-1 EN 61009-1 compliance documentation is provided according to target export markets. Technical documentation files are maintained and updated in line with evolving electrical installation safety regulations.
Direct Technical Access to KRIPAL Production Engineers
Your technical team communicates with the engineers who designed and tested your RCBOs, not a distributor’s sales engineer reading from a catalog. Application questions including earth leakage discrimination receive answers within 24 hours during China business hours.
Frequently Asked Questions
Explore FAQ >RCBOs provide per-circuit selectivity: a fault on one circuit trips only that RCBO while other circuits remain live. With a single RCD protecting multiple MCBs, any earth fault on any circuit disconnects all circuits. RCBOs also save DIN rail space by combining two devices in one module width.
Press the test button monthly per manufacturer recommendations. The test button injects a calibrated residual current and verifies the entire detection and tripping chain. If the RCBO does not trip, replace it immediately. This is a safety-critical device.
For a standard domestic electric cooker with a 6-7kW rating, a 32A B-curve RCBO is typically specified. For larger range cookers above 10kW, a 40A RCBO may be required. Always verify the appliance manufacturer's recommended circuit protection rating.
Yes. UKR3 RCBOs accept both pin-type and fork-type busbar connections and are compatible with standard consumer unit busbar assemblies. The bottom terminal accepts the busbar prong while the top terminal provides the outgoing circuit connection.
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