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ELCB MCCB with Earth Leakage Protection | 16A-630A | Adjustable 30mA-500mA
Factory-Built ELCB & MCCB Solutions for Professional Protection
KRIPAL manufactures earth leakage molded case circuit breakers (ELCB MCCBs), combining overcurrent protection with adjustable earth leakage protection in a single integrated device. Available in frame sizes from 250AF to 400AF with rated currents from 100A to 400A and breaking capacities up to 50kA at 400V AC, the UKM30L features an electronic residual current module with selectable sensitivity from 30mA to 500mA and adjustable time delay (0.1s to 1s). The breaker incorporates an internal zero-sequence current transformer (ZCT) that measures the vector sum of phase and neutral currents to detect ground leakage. An integrated test button simulates a residual current to verify the trip function without external tools. Engineered for selective coordination, upstream units allow downstream RCCBs or RCBOs to clear local faults without tripping the main supply. Fully compliant with IEC 60947-2 Annex B, KRIPAL ELCB MCCBs provide reliable main incoming, sub-main, and equipment-level ground fault protection across industrial and commercial installations.
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Ask a QuoteCombined Overcurrent and Earth Leakage Protection
An earth leakage MCCB (also designated as an ELCB or CBR with integral residual current protection) combines overload and short-circuit protection with ground fault detection using an internal zero-sequence current transformer (ZCT). Unlike standard RCCBs that require upstream protection, an ELCB MCCB delivers three-in-one protection (overload, short-circuit, and earth leakage) in a single compact housing. This design minimizes switchboard space, reduces wiring complexity, and simplifies system coordination. Featuring an adjustable electronic residual current module, it enables precise field setting of sensitivity and time delay to achieve selective coordination with downstream devices, ensuring localized ground faults are cleared without tripping the main breaker. This technical guide covers key considerations for sensitivity thresholds, time delay configuration, and downstream selectivity planning.
UKM30L ELCB MCCB Series Technical Specifications
Adjustable Earth Leakage Sensitivity Selection
The UKM30L earth leakage sensitivity (In) is selectable from 30mA to 500mA (typically 30mA, 50mA, 100mA, 300mA, and 500mA) via an integrated selector switch to match specific circuit protection goals. The 30mA setting provides personal protection against electric shock in direct-contact applications. The 100mA setting offers fire risk prevention, suitable for distribution circuits near combustible materials. Settings of 300mA and 500mA provide equipment protection and serve as upstream selective distribution protection, coordinating smoothly with downstream 30mA RCCBs or RCBOs without causing unwanted nuisance tripping from baseline system leakage. Sensitivity values are clearly indicated on the front panel dial for convenient setup and inspection.
Time Delay and Selective Coordination
The UKM30L adjustable time delay ranges from instantaneous (0s) up to 1 second (e.g., 0.1s, 0.3s, 0.5s, 1s), enabling precise selective coordination across multi-tier electrical networks. The delay operates on a definite-time characteristic: when residual current exceeds the set threshold (In), the internal timer initiates, tripping the MCCB only if the fault persists beyond the set duration. In a typical cascaded protection scheme featuring a 500mA, 0.5s UKM30L at the main distribution board and 30mA instantaneous RCBOs on branch circuits, a 30mA ground fault on a branch circuit trips the downstream RCBO instantly, leaving the upstream main breaker completely un-tripped to ensure continuous power supply to healthy circuits.
Integrated Zero-Sequence Current Transformer (ZCT)
The UKM30L features a factory-built, internal zero-sequence current transformer (ZCT) fully integrated within the molded case. Eliminating the need for external CT sizing, secondary wiring, or mounting kits, the internal ZCT continuously monitors the vector sum of all phase and neutral currents passing through the breaker. Under balanced conditions, the vector sum equals zero; upon detecting a residual current fault, the ZCT signals the internal electronic tripping unit to actuate the breaker mechanism. This fully integrated architecture saves panel space, reduces installation time, and ensures optimal immunity to electromagnetic interference and false tripping caused by loose external CT connections.
Earth Leakage Test and Monitoring
The UKM30L includes a front-panel push-to-test button that generates a simulated residual current across the internal sensing circuit. Pressing the test button verifies the mechanical trip mechanism and electronic control unit functionality instantly without requiring external test instruments. Periodic testing is recommended in accordance with standard maintenance protocols (e.g., IEC 60364-6) to ensure continuous operational readiness. The breaker provides clear visual status indication (TRIP/OFF/ON), allowing maintenance teams to easily distinguish between an earth leakage fault trip and an overcurrent/short-circuit trip event during troubleshooting.
Specify Earth Leakage Protection for Your Installation
- Selectivity Design: Our application engineers help design cascaded ground fault schemes, verifying sensitivity and time delay settings between UKM30L units and downstream RCCBs/RCBOs for complete discrimination.
- System Sizing: Provide your circuit load and system voltage requirements, and our team will recommend the optimal frame size (250AF to 400AF) and breaking capacity rating.
- OEM & Switchboard Supply: Source factory-certified UKM30L ELCB MCCBs with fully integrated ZCTs, offering panel builders a compact, plug-and-play solution that eliminates external ZCT wiring and speeds up switchboard assembly.
Earth Leakage Protection for Critical Environments
KRIPAL UKM30L ELCB MCCBs deliver reliable, combined overcurrent and earth leakage protection at both main incoming and sub-distribution levels across industrial, commercial, and infrastructure applications. Featuring adjustable sensitivity and time delay, the breaker enables precise selective coordination with downstream earth leakage devices. This ensures that any ground fault occurring on a localized final circuit is isolated immediately, preventing unnecessary power interruptions to healthy circuits connected to the same switchboard.
Industrial Main Switchboard Incoming Earth Leakage Protection
A factory main switchboard uses a UKM30L 400A 3P ELCB MCCB as the main incoming protection device, with the earth leakage sensitivity set to 500mA and a time delay of 0.3 seconds. The 500mA threshold provides equipment and fire protection for the main busbars, while the 0.3-second delay ensures selective coordination with downstream 300mA or 30mA devices on branch circuits. Operating via an integrated ZCT, the unit continuously monitors residual current without requiring external sensors. Auxiliaries connect to the switchboard monitoring system, allowing maintenance personnel to track status before fault conditions reach the tripping threshold.
Commercial Building Sub-Main Earth Leakage Protection
A commercial office floor distribution board is supplied by a UKM30L 250A 4P ELCB MCCB featuring a 300mA sensitivity setting and a 0.1-second time delay. This configuration delivers reliable fire risk prevention along vertical risers and cable trays where insulation breakdown could ignite building materials. The 300mA threshold easily accommodates normal background leakage from office electronics (typically 50–80mA across desktop PCs and LED lighting drivers), preventing frustrating nuisance trips while seamlessly coordinating with downstream 30mA RCBOs protecting individual workstation socket outlets.
Water Treatment & Industrial Motor Feeder Protection
A water treatment plant’s submersible pump feeder utilizes a UKM30L 160A 3P ELCB MCCB set to 100mA instantaneous protection. Submersible pumps face high risks of insulation breakdown due to moisture ingress through worn mechanical seals. The 100mA setting provides early fault detection, tripping the pump feeder before a severe phase-to-earth short circuit causes catastrophic motor winding destruction. An auxiliary alarm contact signals the plant SCADA system upon an earth fault event, generating automated maintenance alerts to inspect the pump before severe damage occurs.
Agricultural & Temporary Construction Supply Protection
Temporary construction power pillars and agricultural livestock facilities utilize a UKM30L 250A 4P ELCB MCCB set to 300mA with a 0.1-second delay as the primary incoming feed. These harsh environments carry elevated risks of physical cable damage from heavy machinery or high humidity. The UKM30L serves as a vital backup safety layer, protecting distribution cables upstream of localized 30mA RCDs. The 300mA threshold effectively balances human and livestock shock hazard mitigation against operational continuity in damp, demanding surroundings.
Specify Earth Leakage Protection for Your Power System
- Protection Study: Our application engineers design complete earth leakage protection schemes, verifying UKM30L sensitivity (In) and time delay settings to match your power system requirements.
- Discrimination Verification: Request time-current coordination tables and selectivity analysis for your cascaded ELCB MCCB and downstream RCCB/RCBO schemes.
- OEM Supply: Source UKM30L ELCB MCCBs with factory-built integrated ZCTs and auxiliary option kits, offering switchboard manufacturers a compact, plug-and-play solution that simplifies assembly.
Integrated Testing and Supply Chain
KRIPAL ELCB MCCBs seamlessly integrate earth leakage detection with thermal-magnetic overcurrent protection inside a single molded case. Our manufacturing facility combines standard MCCB assembly lines with a specialized residual current production cell where internal zero-sequence current transformers (ZCTs) and electronic trip modules are precisely assembled, calibrated, and rigorously tested for global earth fault protection applications.
Earth Leakage Detection Module Assembly
The electronic earth leakage module incorporates a high-precision internal zero-sequence current transformer (ZCT) paired with a dedicated control PCB. Built within an ESD-protected production cell, every PCB receives a protective conformal coating post-testing to ensure high moisture and dust resistance in harsh industrial environments. Sensitivity settings are factory-calibrated across selectable thresholds from 30mA to 500mA.
Combined Overcurrent and Earth Leakage Calibration
Every unit undergoes dual-stage calibration: the thermal-magnetic trip unit is calibrated for overload and short-circuit protection per IEC 60947-2, while the electronic earth leakage module is independently verified for residual current protection under IEC 60947-2 Annex B. Instantaneous trip times and adjustable time delays (0.1s to 1s) are fully validated using calibrated test injection gear.
Integrated Test Button and Trip Indication
Each ELCB MCCB features a front-panel push-to-test button that simulates a calibrated residual current to verify the internal ZCT and tripping mechanism without external tools. Clear mechanical trip flags allow maintenance crews to instantly distinguish earth leakage trips from thermal-magnetic overcurrent events. Optional volt-free alarm contacts are available for remote signaling to Building Management Systems (BMS).
Insulation Coordination and Dielectric Testing
Breakers undergo strict dielectric withstand testing at 2500V AC across main poles, open contacts, and internal electronics. The electronic control unit is surge-tested according to IEC 61000-4-5 standards to guarantee high immunity against transient line surges, preventing frustrating nuisance tripping in unstable power grids.
Distributor Stock Holding Programs for ELCB MCCBs
KRIPAL supports international distributor inventory programs with flexible safety stock agreements for high-demand UKM30L frame sizes. Standard models featuring adjustable sensitivity and time delays are kept in ready-to-ship stock, ensuring reliable lead times and planned replenishment for regional distributors.
Private Label and OEM Branding for ELCB MCCBs
We provide comprehensive OEM customization including precise laser-marked part numbers, custom brand logo placement, customized instruction manuals, and OEM outer packaging. Neutral, unbranded packaging options are also readily available for private label switchboard manufacturers.
Multi-Region Certification and Compliance Support
Full compliance documentation—including CE, UKCA, and IEC 60947-2 Annex B test reports—is supplied to support seamless market entry across target export regions. Technical files and certificates are continuously updated to align with evolving international safety regulations.
Direct Technical Access to KRIPAL Production Engineers
Your engineering team communicates directly with KRIPAL design and calibration engineers—not third-party salespeople. Technical inquiries regarding earth leakage selective coordination, system discrimination, or custom OEM configurations receive expert responses within 24 hours during business hours.
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