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Smart Metering MCCB


The MTS3EL residual current operated circuit breaker has a rated insulation voltage of 1000V and is suitable for use in distribution networks with AC 50Hz/60Hz, rated voltage 400V and rated current 50A~630A.


The product can not only provide indirect contact protection, and effectively prevent fire hazards caused by device insulation damage and ground fault current generation, but also can be used to distribute electric energy to protect lines and power devices from overload, under-voltage, short circuits, single-phase grounding and other faults. In addition, the built-in high-precision measurement device realizes high-precision and reliable power measurement and power quality data detection. Support infrared and RS485 communication functions, and can also plug in standard communication modules to support 4G, HPLC, WIFI communication, support cloud platform, and realize remote signaling, telemetry, remote control, and remote adjustment.


Function and Features


1) High-performance 32-bit ARM microprocessor is used for real-time signal acquisition and processing.


2) Double CPU double protection electronic tripping, high breaking capacity design. Long-delay, short-delay, and instantaneous three-stage protection can reliably perform overcurrent and short-circuit protection functions when the line voltage is abnormal. Long-delay supports current inverse time limit operation to ensure the reliability of line protection.


3) Supports short circuits, overvoltage, overcurrent, overload, overtemperature, phase loss, unbalance, neutral loss (only three-phase unbalanced loads support), and residual current protection. Various protection functions and parameters can be set and modified online.


4) Support fault automatic reclosing function, close function, close delay, and close times can be configured.


5) Built-in high-precision measurement dedicated chip, supports high-precision current, voltage, active power, reactive power, and apparent power measurement, and the energy measurement accuracy can reach 0.5. It can display various electrical parameters, alarm information, and operating status in real time.


6) Real-time monitoring of the residual current of the line, and the fastest time of holding action can reach 0.05 seconds. The residual current gear can be adjusted online and supports adaptive tracking adjustment of the residual current gear.


7) Support power quality analysis function, which can monitor grid frequency, harmonics, unbalance and support real-time display of current and voltage waveforms of each phase.


8) Support the function of accumulating electricity in sharp, peak, shoulder, and off-peak, and support two-way energy statistics.


9) Equipped with the temperature detection function of the upper and lower terminals, the accuracy is ±1°C, and line heating protection can be performed.


10) Support infrared and RS485 communication functions, and can also plug in standard communication modules to support 4G, HPLC, WIFI communication, support cloud platform, and realize remote signaling, telemetry, remote control, and remote adjustment.


11) Perfect log system, parameter modification, fault protection, and opening and closing control can be recorded and queried.


12) LCD menu design, multi-language support, ON/OFF and status indicators, friendly man-machine interface, easy to operate.


Technical Specifications

Item Code S3EL-125S S3EL-250S S3EL-400S S3EL-630S
Frame Current 125A 250A 400A 630A
Poles 3P+N
Rated Voltage Ue AC 400V 50Hz AC 415V 50Hz
Rated Insulation Voltage Ui AC 1000V
Rated Impulse Withstand Voltage Uimp 8000V
Arcing Distance ≯50mm ≯50mm ≯100mm ≯100mm
Ultimate Short-circuit Breaking Capacity Icu 50kA 50kA 85kA 85kA
Operating Short-circuit Breaking Capacity Ics 35kA 35kA 65kA 65kA
Rated Residual Short-circuit Making (Breaking) Capacity IΔm 12.5kA 12.5kA 16.25kA 16.25kA
Residual Current Operating Characteristics AC type
Rated Residual Operating Current IΔn 30mA, 50mA, 75mA, 100mA, 150mA, 200mA, 300mA, 400mA, 500mA, 600mA, 800mA, 1000mA, Auto, OFF
Residual Action Time Characteristics Delay Type
Delay Type Limit Non-driving Time 2IΔn:0.06s
Operational Performance (times) Electrical Life 1500 1000 1000 1000
Mechanical Life 8500 7000 4000 4000
Total 10000 8000 5000 5000
Overload and Short Circuit Characteristics Three-stage protection, electronically adjustable, see "Protection Features Description" for details
Joint Control Delay Time ≤3000ms
Communication Delay Time ≤500ms
Basic Function Remote ON/OFF control; high-precision electrical parameter measurement function; power quality analysis function;
waveform display function; fault record statistics function; remote signaling, remote adjustment, remote control, and telemetry
General Protection Function Split-phase short-circuit protection; split-phase inverse time overcurrent protection;
split-phase/summed power overload protection; upper and lower terminal temperature over-temperature alarm, warning;
phase loss; phase sequence; three-phase unbalance; overvoltage and undervoltage warning, alarm; leakage current protection; field setting current
Measurement Accuracy Voltage, current,power level 0.5; energy metering level 1
PV Grid-connected Protection Function Island judgment, power failure and disconnection, monitoring grid status recloser, sharp, peak, shoulder, off-peak statistics
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