Home > Circuit Breakers > Electronic MCCB

Electronic MCCB with Full Digital Protection | LCD Display | 16A-1600A | Energy Monitoring

KRIPAL: Your Professional Molded Case Circuit Breaker Manufacturer

KRIPAL manufactures electronic molded case circuit breakers in the UKM1ET series, replacing the traditional thermal-magnetic trip unit with a microprocessor-based electronic trip unit that provides fully programmable LSIG protection, an LCD display showing real-time current measurements, and Modbus RTU communication for integration with power monitoring and SCADA systems. Available in frame sizes from 160AF to 630AF with breaking capacities up to 65kA at 400V AC, the UKM1ET offers the same advanced protection and measurement capabilities as an ACB in a compact MCCB format. The electronic trip unit provides adjustable long-time (L), short-time (S), instantaneous (I) and ground-fault (G) protection with configurable I squared t or definite time curves, an event log storing the last 10 trip events, and a maintenance log tracking the number of operations and the cumulative interrupted current. The LCD display shows real-time phase currents, ground leakage current, and the protection settings, and a programmable digital output can be configured for trip, pre-alarm or maintenance alert functions. The UKM1ET is ideal for installations where power monitoring is required but the budget or physical space does not allow for a full ACB, such as sub-distribution boards, MCC incomers and critical equipment feeders.

Get A Quote
Electronic MCCB with Full Digital Protection | LCD Display | 16A-1600A | Energy Monitoring

Download Catalog

For more information, please download the album.

Get A Free Quote Download Catalog

Understanding Full Electronic MCCBs

An electronic MCCB replaces the mechanical bimetallic strip and magnetic coil of a thermal-magnetic MCCB with a microprocessor-based system that measures current via Rogowski coil sensors (air-core current transformers) and executes the protection algorithms in software. The electronic approach provides inherently more accurate protection (Class 1 accuracy for the long-time function compared to Class 10-20 for thermal-magnetic), wider adjustment ranges, additional protection functions (ground-fault), and built-in measurement and communication capabilities that transform the MCCB into an intelligent power monitoring node. The UKM1ET combines the compact dimensions and cost of an MCCB with the advanced functionality of an ACB trip unit. This selection guide covers the LSIG functions, measurement and communication capabilities.

UKM1ET Electronic MCCB Series Technical Specifications

LSIG Protection with Programmable Curves

The UKM1ET provides four independently configurable protection functions. Long-time (L): adjustable pickup 0.4-1.0 In, time multiplier 0.5-30s at 6x pickup, with thermal memory that tracks the thermal state of the protected equipment during intermittent overloads. Short-time (S): adjustable pickup 1.5-10x L pickup, time delay 0.1-0.4s, with selectable I squared t (for coordination with thermal downstream devices) or definite time (for coordination with electronic downstream devices). Instantaneous (I): adjustable 2-15x In, with an OFF setting. Ground-fault (G): adjustable pickup 0.2-1.0 In (maximum 1200A), time delay 0.1-0.4s, with selectable I squared t or definite time. All settings are configured via pushbuttons on the trip unit faceplate with the values displayed on the LCD, and a password protection feature prevents unauthorized changes.

Rogowski Coil Current Sensing

The UKM1ET uses Rogowski coil sensors (also called air-core current transformers) instead of iron-core CTs to measure the phase currents. A Rogowski coil is a helical winding on a non-magnetic former that produces a voltage proportional to the rate of change of current (di/dt), which is then integrated electronically to recover the current waveform. The advantages over iron-core CTs include: no saturation at high fault currents (the Rogowski coil remains linear up to 20 times the rated current, eliminating the need for CT saturation modeling in protection coordination studies), wide bandwidth (the coil responds accurately to currents from 50 Hz to several kHz, enabling harmonic current measurement), and compact size (the Rogowski coil occupies less space in the MCCB, contributing to the UKM1ET’s frame size being identical to the equivalent thermal-magnetic UKM1).

LCD Display and Real-Time Measurements

The UKM1ET front-panel LCD displays real-time electrical parameters in a scrolling sequence: phase currents Ia, Ib, Ic, In (neutral), ground leakage current Ig, phase-to-phase voltages (if the optional voltage inputs are connected), active power, apparent power, power factor, frequency, and energy (kWh). The display also shows the active protection settings for the L, S, I and G functions, and the cause of the last trip (overload, short-circuit or ground-fault). A maintenance log accessible from the display tracks the total number of operations (close/open cycles), the number of trip operations, and the cumulative I squared t interrupted by the MCCB since commissioning, providing data for condition-based maintenance decisions. The display backlight activates when a pushbutton is pressed and remains illuminated for 60 seconds.

Modbus Communication and SCADA Integration

The UKM1ET includes an RS-485 Modbus RTU communication port as standard, with an open Modbus register map that provides read access to all measurements, protection settings, trip event log and maintenance log, plus write access to selected settings (remote setting adjustment with appropriate password authorization). The Modbus port connects to the facility’s power monitoring system via a single twisted-pair cable (daisy-chain up to 32 UKM1ET units on one RS-485 bus), with the communication protocol documented in a publicly available register map. This enables centralized monitoring of all UKM1ET MCCBs in the facility from the SCADA or BMS workstation, with automatic alarm generation on trip events and trend logging of current and power measurements for energy management and ISO 50001 reporting.

Deploy Electronic MCCBs for Intelligent Power Distribution

  • Protection and Monitoring Design: Our engineers configure the UKM1ET LSIG settings and Modbus communication for your power distribution network.
  • Modbus Integration Support: Request the register map and a reference configuration file for SCADA integration.
  • OEM Supply: Source UKM1ET MCCBs pre-configured with your protection settings and communication parameters.

Applications of Full Electronic MCCBs in Smart Infrastructure

KRIPAL UKM1ET electronic MCCBs bring ACB-level intelligence to the sub-distribution and equipment feeder level, providing power monitoring, event logging and communication capabilities that were previously only available in full-size air circuit breakers. From the sub-main MCCB in a commercial building to the critical equipment feeder in a pharmaceutical plant, the UKM1ET transforms every circuit breaker into a connected power monitoring node.

Commercial Building Sub-Main with Energy Monitoring

A commercial building uses UKM1ET MCCBs on all sub-main feeders from the main switchboard to each floor’s distribution board. Each UKM1ET measures the floor’s power consumption and reports it via Modbus to the building’s energy management system, enabling per-floor energy billing for multi-tenant buildings. The event log captures any trip events with the pre-fault current, allowing the facilities team to investigate the cause of a floor power outage without sending an electrician to each floor’s distribution board. The maintenance log tracks each MCCB’s operations, and the facilities team schedules contact inspection when the cumulative interrupted current exceeds 80 percent of the MCCB’s rated I squared t endurance.

Pharmaceutical Plant Critical Equipment Feeder

A pharmaceutical manufacturing plant uses UKM1ET MCCBs on the feeders to critical process equipment (reactors, centrifuges, lyophilizers) where an unexpected trip can destroy a batch worth hundreds of thousands of dollars. The UKM1ET ground-fault protection is set to a low threshold with an alarm-only output (not trip) for the pre-alarm stage, alerting the maintenance team to increasing earth leakage before it reaches the trip threshold. The Modbus communication reports the real-time current to the plant’s batch management system, which logs the process equipment’s power consumption as part of the batch record for regulatory compliance (FDA 21 CFR Part 11). The event log provides the exact time and cause of any trip, supporting the deviation investigation required by pharmaceutical quality systems.

Data Center Power Usage Effectiveness Monitoring

A data center uses UKM1ET MCCBs on the mechanical services feeders (chillers, CRAC units, pumps) and the IT load feeders (UPS output to server rooms) to enable continuous power usage effectiveness (PUE) calculation. The UKM1ET on the mechanical services incomer measures the cooling and infrastructure power, and the UKM1ET on the IT incomer measures the server load, with both reporting via Modbus to the DCIM system. The DCIM calculates PUE as total facility power divided by IT equipment power, updated every 15 minutes. The maintenance log on each UKM1ET alerts the facilities team when the MCCB has interrupted a cumulative fault current approaching its endurance rating, triggering proactive replacement during a scheduled maintenance window.

Wastewater Treatment Plant SCADA Integration

A wastewater treatment plant with unmanned operation during night shifts uses UKM1ET MCCBs on all pump and process equipment feeders, with the Modbus communication reporting to the central SCADA system. When a pump MCCB trips at 3 AM, the SCADA receives the trip event (including the fault type, current and time stamp) within 2 seconds via the RS-485 network, automatically dispatches an SMS alert to the on-call maintenance technician, and attempts to start the standby pump. The rapid fault diagnosis from the UKM1ET event log (distinguishing between overload, short-circuit and ground-fault) allows the technician to arrive on site with the correct spare parts and test equipment, reducing the mean time to repair from hours to less than 60 minutes.

Electric Vehicle Charging Hub Power Distribution

An EV charging hub with 20 DC fast chargers uses UKM1ET MCCBs on the feeder to each group of 5 chargers, with the Modbus communication reporting to the charger management system (CMS). The CMS monitors the current on each feeder and implements dynamic load management: if the total charging hub current approaches the site’s supply limit, the CMS reduces the charging current on lower-priority chargers rather than tripping the main incoming MCCB. The UKM1ET event log captures any trip events and distinguishes between overload (too many chargers at full power) and short-circuit (cable damage or charger fault), directing the maintenance response accordingly.

Upgrade to Intelligent MCCB Protection

  • Protection and Monitoring Design: Our application engineers configure the UKM1ET for your specific protection coordination and power monitoring requirements.
  • SCADA Integration Support: Request the Modbus register map, communication settings guide and a reference SCADA configuration template.
  • OEM Supply: Source UKM1ET MCCBs pre-configured and factory-tested, ready for integration into your intelligent switchboard.
Applications of Full Electronic MCCBs in Smart Infrastructure

KRIPAL Electronic MCCB Manufacturing and OEM Services

KRIPAL electronic MCCBs with full digital protection are manufactured in an advanced electronics integration facility where the microprocessor-based trip unit with LCD display, energy metering, and communication interfaces is assembled into the MCCB body. Each electronic MCCB undergoes a comprehensive automated test sequence covering all protection, measurement, and communication functions for global intelligent power distribution applications.

Integrated Energy Metering Calibration

The built-in energy metering function is calibrated against a reference power analyzer. Voltage and current sensing accuracy is verified to Class 1 per IEC 61557-12 for active energy measurement. Real-time values for voltage, current, power, power factor, and THD are verified at multiple test points across the measurement range during end-of-line test.

Harmonic Analysis and Power Quality Functions

The harmonic analysis function measuring THD and individual harmonics up to the 15th order is verified by injecting a synthesized waveform with known harmonic content. The trip unit’s true RMS sensing is tested with distorted current waveforms to confirm that thermal protection responds to heating effect rather than average current, critical for installations with high harmonic content.

Event and Data Logging Memory Verification

The onboard event logger recording trip events, alarm conditions, and maintenance data (operations counter, contact wear indicator) is tested for correct timestamp generation and data retention in non-volatile memory. Power-off retention is verified by cycling supply power and confirming that logged events remain accessible.

Full Automated End-of-Line Test Sequence

Each electronic MCCB undergoes a comprehensive automated test: contact resistance, dielectric withstand, trip unit calibration on all protection functions (L, S, I, G), display and keypad test, communication interface loopback test, energy metering accuracy verification, and real-time clock function test. The complete test report is stored against the serial number.

Distributor Stock Holding Programs for Electronic MCCBs

KRIPAL supports distributor inventory programs with agreed stock levels for standard electronic MCCB models with popular communication protocol configurations. Technical training on trip unit configuration software is provided for key distribution partners.

Private Label and OEM Branding for Electronic MCCBs

Custom startup screen branding on the LCD display, OEM default parameter sets, and project-specific configuration files pre-loaded at the factory are available. Neutral-packaged supply is provided for private label programs.

Multi-Region Certification and Compliance Support

CE, UKCA, and IEC 60947-2 compliance documentation including EMC and energy metering accuracy certificates are provided. Cybersecurity documentation for communication-enabled devices is available for projects requiring IEC 62443 compliance assessments.

Direct Technical Access to KRIPAL Electronics and Firmware Engineers

Your technical team communicates directly with the engineers who designed the electronic MCCB hardware, firmware, and communication protocols. Application questions including system integration with building management and SCADA systems receive answers within 24 hours during China business hours.

Get A Free Quote

Frequently Asked Questions

Explore FAQ >
A full electronic moulded case circuit breaker is an advanced circuit protection device where all protection, measurement, and communication functions are performed by an integrated microprocessor system using Rogowski coil current sensing technology. It protects electrical circuits against overload, short circuit, earth fault, phase unbalance, under-voltage, over-voltage, abnormal frequency, and power reversal conditions. Beyond protection, it functions as an integrated power quality meter providing true RMS measurements, harmonic analysis to the 31st order, energy metering, event logging, and waveform capture. This consolidation of protection and metering into a single device reduces panel space, simplifies wiring, and provides a unified data stream for energy management and condition-based maintenance programmes.
KRIPAL full electronic MCCBs are available in frame sizes from 100A to 1600A with rated operational voltage of 690VAC and rated insulation voltage of 1000V. Short-circuit breaking capacity ranges from 35kA to 100kA at 415VAC. The Rogowski coil sensing system provides linear current measurement from 5 percent to 200 percent of rated current with metering accuracy meeting IEC 61557-12 Class 1. Protection functions include long-time, short-time, instantaneous, earth fault, phase unbalance, under/over voltage, under/over frequency, and power reversal, all with fully adjustable settings. Harmonic analysis captures individual harmonic magnitudes through the 31st order with total harmonic distortion calculation. Communication options include Modbus RTU, Modbus TCP, and IEC 61850 protocol support. The trip unit is self-powered with a backup supercapacitor that maintains event logging and communication during supply interruptions. Operating temperature range is -5 to +70 degrees Celsius.
KRIPAL full electronic MCCBs are manufactured under ISO 9001 certified quality management. The product range carries CE marking and CB Scheme certification. IEC 60947-2 type testing including short-circuit breaking capacity verification has been completed at KEMA and ASTA-recognised laboratories. The Rogowski coil sensing and metering system has been independently validated to IEC 61557-12 accuracy requirements. Electromagnetic compatibility testing to IEC 61000-4 series standards has been completed, covering immunity to surges, fast transients, electrostatic discharge, and radiated electromagnetic fields. All products comply with RoHS and REACH requirements. Continuous type testing on production samples maintains current verification data. Full certification documentation is provided to OEM partners and EPC contractors.
Determine the frame size and breaking capacity based on your load current and available fault level at the installation point. Select the protection function package that matches your system requirements: at minimum LSIG covering overload, short circuit, and earth fault; add voltage, frequency, and power reversal protection if your application involves on-site generation or sensitive processes. Specify the communication protocol based on your automation system architecture: Modbus RTU for PLC integration, Modbus TCP for Ethernet-based SCADA, or IEC 61850 for substation automation environments. Consider the metering requirements: if energy management or ISO 50001 compliance is a project goal, the full electronic MCCB's built-in metering may eliminate the need for separate power meters. Review the environmental conditions: the standard operating range covers most indoor applications, but verify temperature and humidity limits for outdoor or unconditioned installations. KRIPAL application engineers can review your system architecture, single-line diagram, and data integration requirements to recommend the appropriate model and communication configuration.
Standard full electronic MCCB configurations in commonly specified frame sizes and current ratings have a lead time of 20 to 25 working days from confirmed purchase order. Configured-to-order units with specific communication protocol options or custom firmware settings may require 30 to 40 working days depending on the complexity of the configuration and current production loading. The minimum order quantity is 3 units per frame size for standard configurations. OEM partnership agreements provide the flexibility of smaller batch sizes, scheduled deliveries aligned with project timelines, and consignment stock programmes for high-volume partners. Evaluation samples of 1 to 2 units are available to qualified distributors and EPC contractors. KRIPAL ships FOB Ningbo or Shanghai, with standard sea freight and air freight options. Large project orders with defined delivery schedules can secure dedicated production slots.
KRIPAL provides a 24-month warranty on full electronic MCCBs from date of shipment. Technical support encompasses protection coordination studies, communication network commissioning, integration with third-party energy management and SCADA platforms, and firmware update management. KRIPAL supplies coordination study software, communication protocol implementation guides, and Modbus register maps to distributor partners. Event log analysis support helps identify the root cause of trip events using the breaker's stored waveform and event data. For warranty claims, KRIPAL provides advance replacement where available or ships replacement units within 7 to 10 working days. Spare trip units, Rogowski coil assemblies, communication modules, and accessory kits are maintained in stock for the full service life of each frame size. On-site commissioning and training for major projects can be arranged at time of order, with KRIPAL engineers travelling to project locations worldwide.

Direct from Manufacturer

How Can We Assist You?

Tell us a bit more so we can route your request to the right engineer. Get factory-direct pricing and custom specifications within 24 hours.

+86-15381576159 sale3@kripal.com