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RCCB Residual Current Circuit Breakers 25A-100A 30mA-300mA
Electrical Circuit Protection-RCCB/ELCB/RCD
KRIPAL manufactures residual current circuit breakers (RCCBs) in the UKR7 series for earth leakage protection in residential, commercial and industrial low-voltage installations. These devices detect residual current (the imbalance between the current flowing in the line and neutral conductors) using a sensitive toroidal current transformer, and trip the circuit when the residual current exceeds the rated sensitivity, protecting people from electric shock and preventing fires caused by earth leakage currents. Available in 2P and 4P configurations with rated currents from 25A to 100A and sensitivities of 10mA, 30mA, 100mA, 300mA and 500mA, the UKR7 complies with IEC/EN 61008-1 for RCCBs without integral overcurrent protection. KRIPAL RCCBs feature a test button that injects a calibrated residual current through the toroid to verify the tripping mechanism operates within the specified time, and an electromechanical trip mechanism that functions independently of the supply voltage, providing protection even if the line conductor upstream of the RCCB is broken. Type A (AC and pulsating DC) and Type AC (sinusoidal AC only) variants are available, with Type A recommended for circuits containing electronic equipment that can generate pulsating DC leakage currents.
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UKF7 ELCB 2Pole 230V AC RCD 30mA 40A Residual Current Circuit Breaker
The UKF7-63 Earth leakage Circuit Breaker is a high-performance 2-Pole Earth Leakage Circuit Breaker (ELCB), also known as a Residual Current Device (RCD).
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UKF7-63 ELCB 4Pole 400V AC RCD 30Ma 6A Residual Current Circuit Breaker
The UKF7-63 Earth leakage Circuit Breaker is a high-performance 2-Pole Earth Leakage Circuit Breaker (ELCB), also known as a Residual Current Device (RCD).
Ask a QuoteRCCB Protection: How Earth Leakage Detection Prevents Electric Shock and Fire
An RCCB, also known as an RCD (Residual Current Device) or ELCB (Earth Leakage Circuit Breaker), is a protective device that disconnects a circuit when it detects current leaking to earth. Unlike an MCB which protects against overcurrent, an RCCB protects against electric shock (current flowing through a person to earth) and earth leakage fires (current flowing through degraded insulation to earthed metalwork, heating the leakage path until ignition). An RCCB works by passing the line and neutral conductors through a toroidal current transformer: in a healthy circuit, the magnetic fields cancel because the line and neutral currents are equal and opposite; when earth leakage occurs, the imbalance creates a net magnetic flux that induces a voltage in the secondary winding, which triggers the trip mechanism. This selection guide covers sensitivity, type, rated current and pole configuration.
UKR7 RCCB Series Technical Specifications
Sensitivity Selection for Personnel and Fire Protection
The RCCB sensitivity (rated residual operating current, I delta n) is selected based on the protection objective. 10mA and 30mA sensitivities provide personal protection against electric shock, because a current above 30mA flowing through the human body can cause ventricular fibrillation if it persists for more than 200 milliseconds. 30mA is the standard for socket outlet circuits in domestic and commercial installations per IEC 60364. 100mA sensitivity provides fire protection by disconnecting before earth leakage current through degraded insulation reaches a level that can ignite surrounding materials (typically 300-500mA for PVC-insulated cable). 300mA and 500mA sensitivities provide equipment protection and are used as upstream selectivity RCCBs in cascaded installations where downstream circuits have 30mA protection. A 100mA RCCB must not be used as the sole means of personal protection.
RCCB Type: AC, A and the Importance of DC Immunity
Type AC RCCBs respond to sinusoidal AC residual currents only and are suitable for circuits without electronic loads. Type A RCCBs respond to both AC and pulsating DC residual currents (up to 6mA smooth DC superimposed) and are required for circuits containing single-phase rectifier loads such as LED lighting drivers, computer power supplies and washing machine inverter drives. Type A is the minimum recommendation for any modern installation per IEC 60364-5-53 because most household appliances now contain electronic power supplies that generate pulsating DC leakage. Type B (not in the current UKR7 range) adds response to smooth DC, high-frequency AC (up to 1kHz) and multi-frequency residual currents for circuits containing three-phase rectifiers, EV chargers and PV inverters. Always verify the RCCB type matches the expected leakage waveform of the connected equipment.
Electromechanical Trip and Voltage Independence
The UKR7 uses an electromechanical trip mechanism that derives its tripping energy directly from the residual current in the secondary winding of the toroidal transformer, not from the mains supply voltage. This voltage-independent operation means the RCCB will trip on an earth fault even if the line conductor upstream of the RCCB is broken (which would de-energize the RCCB’s electronics in a voltage-dependent design). The trip mechanism uses a permanent magnet to hold the contacts closed and a trip coil that opposes the permanent magnet flux when the residual current threshold is reached, releasing a spring-loaded toggle mechanism. The trip time is less than 40 milliseconds at 5 times I delta n, and less than 300 milliseconds at I delta n, meeting the IEC 61008-1 requirements that ensure fibrillation protection per the IEC 60479-1 ventricular fibrillation curve for the human body impedance model.
Selective (Time-Delayed) RCCBs for Cascaded Installations
In installations with multiple RCCBs in cascade (for example, a 300mA RCCB at the distribution board incoming and 30mA RCCBs on individual circuits), a time-delayed (Type S, selective) RCCB at the upstream position prevents the entire installation from losing power when a downstream RCCB clears a local fault. The UKR7-S variant adds an intentional time delay of 40-150 milliseconds at I delta n, allowing the downstream instantaneous RCCB to trip first. The upstream RCCB also has a higher sensitivity (300mA or 500mA) so that it only operates on faults that the downstream units cannot clear, providing discrimination in both current magnitude and time domain. Without a selective upstream RCCB, a single earth fault on one circuit would cause a nuisance disconnection of the entire installation.
Specify RCCBs for Your Installation
- RCCB Selection Assistance: Provide your circuit list and equipment types, and we recommend the correct RCCB sensitivity, type and selectivity scheme.
- Type-Test Certificates: Obtain IEC 61008-1 test reports for your distribution board certification and building control compliance documentation.
- OEM Bulk Supply: Order UKR7 RCCBs in bulk packs for your panel building operation with your choice of sensitivity, type and current rating.
Earth Leakage Protection Across Residential, Commercial and Industrial Installations
KRIPAL UKR7 RCCBs are installed in distribution boards and consumer units worldwide wherever earth leakage protection is specified by the wiring regulations. From the main incoming RCCB in a domestic consumer unit to the equipment-level RCCB in an industrial control panel, these devices provide the first line of defense against electric shock and electrical fire.
Domestic Consumer Unit Main Incoming RCCB
A typical UK domestic consumer unit uses a 100A 30mA Type A RCCB as the main incoming device, protecting all downstream circuits against earth leakage. The RCCB is connected directly to the meter tails, and the MCBs for individual circuits are fed from the RCCB output. If an earth fault occurs on any circuit, the RCCB trips and disconnects the entire installation, which is acceptable for domestic premises where the householder can investigate and reset. For higher-availability installations, a split-load consumer unit with two RCCBs (each protecting half the circuits) or individual RCBOs per circuit provides better discrimination.
Commercial Distribution Board Sub-Main Protection
Commercial distribution boards use a 100mA or 300mA selective (Type S) RCCB as the sub-main incoming device, providing fire protection for the distribution cables while allowing downstream 30mA RCCBs or RCBOs on final circuits to clear personal-protection faults without tripping the sub-main. The selectivity is achieved through both current threshold (the sub-main RCCB at 300mA does not respond to a 30mA fault) and time delay (the 40-150ms delay on the sub-main RCCB allows the downstream instantaneous 30mA device to trip first on faults above 300mA). This cascaded scheme satisfies the requirement of IEC 60364-5-53 for selectivity in installations where continuity of supply is important.
Construction Site Temporary Distribution Board
Temporary distribution boards on construction sites require 30mA RCCB protection on all socket outlet circuits below 32A per IEC 60364-7-704 for construction and demolition sites. KRIPAL UKR7 RCCBs in IP65 enclosed distribution boards provide this protection, with the electromechanical trip mechanism ensuring that the RCCB operates even if the generator supply voltage sags or the supply cable is damaged. The RCCB must be tested daily using the test button to verify the trip mechanism has not seized due to dust, vibration or corrosion, a requirement that is enforced by site safety inspections. The compact 2-module (36mm) width per pole allows the RCCB to fit within the limited space of a site distribution board that must be portable and lifted by two people.
Agricultural Building Circuit Protection
Agricultural buildings (barns, milking parlors, grain stores) present a high risk of electric shock due to the presence of livestock, wet concrete floors, and metal structures that provide low-impedance earth paths. IEC 60364-7-705 for agricultural premises requires 30mA RCCB protection on all circuits, with a maximum tripping time of 0.3 seconds. KRIPAL UKR7 30mA Type A RCCBs meet this requirement, with the electromechanical trip operating reliably in the high-humidity, high-ammonia atmosphere of livestock buildings where electronic trip circuits would be susceptible to corrosion. The RCCB is installed in an IP65 enclosure to prevent dust and wash-down water ingress, and is tested monthly as part of the farm’s electrical safety inspection routine.
Swimming Pool and Fountain Circuit Protection
Circuits supplying swimming pool pumps, underwater lighting, sauna heaters and decorative fountains require 30mA RCCB protection per IEC 60364-7-702, with a maximum tripping time of 0.1 seconds due to the increased risk of electric shock when a person is immersed in water (which dramatically reduces skin impedance from approximately 1000 ohms for dry skin to 200-300 ohms for wet skin). KRIPAL UKR7 RCCBs are specified for these circuits, with the test button operated monthly as part of the pool operator’s safety checklist. The RCCB must be installed in a location that is not accessible to pool users but is visible to the pool operator, typically in the pool plant room with a clear label indicating the protected circuits.
Specify Earth Leakage Protection
- Selectivity Design: Our engineers design a cascaded RCCB scheme for your installation with verified time-current discrimination between upstream and downstream devices.
- Leakage Current Audit: Provide your connected equipment list and we calculate the expected standing earth leakage to verify your chosen RCCB sensitivity will not cause nuisance tripping.
- OEM Distribution Board Supply: Source UKR7 RCCBs with your branded distribution boards, fully certified and tested.
KRIPAL RCCB Manufacturing: Precision Sensing for Life Safety Protection
KRIPAL residual current circuit breakers are manufactured on a dedicated RCD assembly line where the summation current transformer core is wound and tested, the sensitive trip relay is calibrated to the rated residual operating current, and the complete RCCB undergoes a ramp test and trip time verification for global residential and industrial earth leakage protection.
Summation Current Transformer Core Winding and Test
Toroidal cores made from high-permeability nanocrystalline or permalloy strip are wound with precision secondary turns on a toroidal winding machine. Each completed summation transformer is tested for output voltage at the rated residual current (30mA, 100mA, 300mA) using a calibrated primary injection test set, with sensitivity verified within plus or minus 20 percent of rated I-delta-n.
Trip Relay Calibration and Assembly
The electromagnetic trip relay is assembled from a permanent magnet, armature, and precision spring. Spring tension is adjusted and locked on an automated calibration station that injects the rated residual current and verifies tripping within the 40ms (for 5 times I-delta-n) time limit per IEC 61008-1. Calibrated relays are serialized for traceability.
Ramp Test and Trip Time Verification
Every RCCB undergoes an automated ramp test where residual current is increased from zero at a controlled rate until tripping occurs, verifying that the trip threshold falls within 0.5 to 1.0 times the rated I-delta-n. A subsequent trip time test at 5 times I-delta-n confirms operation within the 40ms maximum, with results recorded per serial number.
Test Button and Indicator Assembly Verification
The integrated test button circuit is verified on every unit by an automated actuator that presses the test button and confirms trip relay operation. The contact position indicator (red/green flag) is visually inspected by an automated camera system to confirm positive indication in both ON and tripped states.
Distributor Stock Holding Programs for RCCBs
KRIPAL supports distributor inventory programs with agreed stock levels for standard RCCB models across 25A to 100A in 30mA, 100mA, and 300mA sensitivities. Shipments are planned based on demand data, with scheduled replenishment to maintain stable supply.
Private Label and OEM Branding for RCCBs
Laser-marked part numbers aligned with your catalog, OEM-branded packaging, and customized instruction sheets are available. Unbranded supply is provided upon request for private label production of RCCBs.
Multi-Region Certification and Compliance Support
CE, UKCA, and IEC 61008-1 EN 61008-1 compliance documentation is provided according to target export markets. Technical documentation files are maintained and updated in line with evolving electrical safety regulatory requirements.
Direct Technical Access to KRIPAL Production Engineers
Your technical team communicates with the engineers who designed and calibrated your RCCBs, not a distributor’s sales engineer reading from a catalog. Application questions including discrimination of series-connected RCDs receive answers within 24 hours during China business hours.
Frequently Asked Questions
Explore FAQ >An MCB protects against overcurrent (overload and short circuit). An RCCB protects against earth leakage (residual current flowing to ground). They serve different protection functions. An RCCB will trip on a 30mA earth fault that an MCB cannot detect because the fault current is far below the MCB's tripping threshold.
IEC 61008-1 recommends pressing the test button monthly. The test button injects a calibrated residual current through the detection circuit, verifying the entire sensing and tripping chain. If the RCCB does not trip when the test button is pressed, replace it immediately.
30mA for circuits where personal protection against electric shock is required: socket outlets, bathrooms, outdoor circuits. 100mA or 300mA for sub-main distribution where the primary purpose is fire prevention from insulation faults, with personal protection provided by downstream 30mA devices.
Type AC detects sinusoidal AC residual currents only. Type A additionally detects pulsating DC residual currents with up to 6mA smooth DC superimposed. Type A is required for circuits supplying electronic equipment, EV chargers, induction hobs and any load with rectifiers or switch-mode power supplies.
Yes. A single RCCB can protect multiple downstream MCBs on separate final circuits. However, any earth fault on any circuit will trip the RCCB and disconnect all circuits. For better availability, consider individual RCBOs per circuit or split the installation across multiple RCCBs.
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