Intelligent MCCB from China Factory - CBRM5ENCL with Auto-Reclosing, Residual Current Protection, and Remote Control Solutions

Product Model and Meaning

Scope of Application

Low-voltage switchgear. Featuring a secondary separation and modular design concept, the secondary module supports hot-swappable components for flexible maintenance. In addition to standard overload, undervoltage, and short-circuit protection functions, it also provides energy metering, contact temperature monitoring protection, topology signal transmission and recognition, voltage qualification rate statistics, power quality analysis, event logging, and real-time reporting. The product utilizes industrial-grade high-performance microprocessors and high-precision analog-to-digital converters, offering robust data processing capabilities, communication functions, and high-precision sampling. It incorporates a compact power carrier module with local RS485 and carrier communication interfaces. When paired with smart integrated substation terminals, it supports advanced IoT applications in new power system scenarios. Suitable for AC 50Hz grids with rated insulation voltage 1000V, rated current 100A-630A, and rated operating voltage 400V or below. Equipped with intelligent tripping mechanisms, this circuit breaker not only expands the adjustable current range but also features three-tier protection: long-duration overload protection, short-duration short-circuit protection, and instantaneous short-circuit protection.

Service Environment

Regular service conditions:

• The upper limit of ambient air temperature should not exceed +40℃, and the lower limit should not be lower than -5℃. The average temperature within 24 hours should not exceed +35℃. Note: Circuit breakers used in ambient air temperatures above +40℃ or below -5℃ should be consulted with the manufacturer.
• The altitude of the installation site should not exceed 2000m;
• The relative humidity of the atmosphere should not exceed 50% at the highest ambient temperature of +40℃; higher relative humidity may occur at lower temperatures (e.g. 90% at 20℃), and condensation on the product surface due to temperature changes should be taken into account.

Main features and characteristics

• It employs a high-performance 32-bit ARM microprocessor for real-time signal processing and intelligent control;
• LCD Chinese display, friendly human-machine interface, simple operation;
• It has three sections of protection, long delay, short delay and instantaneous, and adopts electronic trip, which is independent of power supply voltage;
• High breaking capacity to ensure the reliability of line short circuit protection;
• Overvoltage protection, undervoltage protection, and phase loss protection, protection functions and parameters can be set and modified online;
• Real-time display of line residual current, three-phase power supply voltage and load current; Real-time measurement of active power, reactive power, apparent power, power factor, and other parameters;
• Identify, display, and store trip types (such as residual current, lockout, overload, undervoltage, overvoltage, phase loss, etc.), and support query and deletion.
• During current fault protection, the cause of the fault can be stored and reported.
• You can query real-time load details: current, voltage, phase loss, etc.
• It collects short circuit, overload, overvoltage, undervoltage, phase shortage and other comprehensive electrical protection;
• It has built-in communication functions, which can realize remote signaling, remote measurement, remote control and remote adjustment;
• Supports four remote functions: telemetry, remote signaling, remote control, and remote adjustment.
• Separate secondary plug-in module;
• Real-time measurement of active power, reactive power, apparent power, power factor and other parameters;
• Three-phase active power accumulation;
• Supports DL/T645 and Modbus protocols with automatic recognition; Real-time temperature monitoring of incoming/outgoing cable terminal strips (optional); Supports online remote upgrades and maintenance;
• Accuracy class: Current and voltage accuracy up to 0.5S class, active and reactive power accuracy up to 1 class; Supports automatic meter reading and analysis of energy loss in meter boxes;
• Supports customized electricity meter reading and an object-oriented data exchange protocol for power consumption information (Extended Edition of Power Internet of Things). Enables active reporting of HPLC events and position change information;
• Supports data encryption;
• With local protection: RS485 is used for local maintenance;
• It has the function of forward and reverse active power energy measurement, and the function of measuring active power energy by phase;
• Freeze features: includes minute, hourly, daily, and monthly freezes;
• Data reset function: Clear the electrical energy, frozen quantity, and event record data stored in the switch;
• Features daily and monthly voltage compliance statistics, including voltage monitoring duration, compliant voltage periods, voltage exceeding upper/lower limits, compliance rate, peak voltage values with occurrence times, and minimum voltage values with occurrence times;
• Measures the amplitude and proportion of harmonics from 2nd to 21st order, and provides statistical analysis of odd and even harmonic content ratios;
• Features advanced measurement capabilities;
• It supports storage of data items such as AC voltage, current, and events;
• Features alarming of phase loss current, voltage (current) imbalance, phase sequence and power demand exceeding limits; the switch supports power failure, opening/closing, overcurrent, and overvoltage protection; Features include current imbalance, undervoltage, voltage imbalance, phase failure, and zero-sequence current event logging. Each event record contains occurrence time, cause, phase, and electrical parameters at the time of occurrence;
• Features time synchronization, supports local and broadcast synchronization, and receives and executes time synchronization commands from the master station system;
• Monitoring function: detect the open and close status information;
• Supports sending and recognizing topology signals; Supports power outage reporting: Carrier reporting within 60 seconds after a power outage;
• Indicator Description: The indicator functions are located on the front of the measurement module, including Bluetooth, alarm, closing, fault, and leakage indicators. The blue light stays on to indicate Bluetooth connection, while blinking indicates no connection. The red light stays on to indicate an alarm, while off indicates no alarm;
• Measurement range: Measures total and phase active power, reactive power, power factor, phase voltage, phase current, frequency, and other operational parameters. The measurement range complies with the following requirements: voltage range: 0.7Ue to 1.15Ue; current range: 0.004In to 1.2In; frequency measurement range: 45Hz to 55Hz; power factor measurement range: (0.500~1.000); temperature measurement range of input and output terminals: -25℃ ~ 120℃; The residual current (leakage) protection can be adjusted online, and the residual current level can be adjusted online, with reclosing function; Real-time monitoring and tracking of the residual current of the line, automatic adjustment of the range, to ensure the operation rate and reliability of the product; Protective functions and parameters can be set and modified online.

Service Environment

• Ambient temperature: -5℃ to +40℃, with an average of no more than +35℃ within 24 hours.
• Altitude: the altitude of the installation site should not exceed 2000m;
• Atmospheric conditions: The relative humidity of the installation site should not exceed 80% when the surrounding maximum temperature is +40℃; when the average minimum temperature of the wettest month is +25℃, the average maximum relative humidity of the month should be 90%, and the condensation on the surface of the product due to temperature change should be considered.
• Installation category: Ⅲ;
• Pollution level: The pollution level of the installation site is level 3;
• Installation conditions: the switch should be installed in the place without explosion hazard, without conductive dust, and without substances sufficient to corrode metal and insulation; in the place without rain and snow invasion.
• Wiring method: screw terminal is used to tighten the wire with screw.

Key Technical Specifications

Protection Features

◆ Overload long delay protection
Overload long delay action value parameter setting range (Table 1)

Overload long delay action characteristics (Table 2)

◆ Time-delay characteristics
The overload protection is based on the inverse time characteristic: T= (6lrl/l)² * tL, delay accuracy: ± 10% where T is the action time, Irl is the long delay protection setting, I is the fault current, and tL is the long delay time setting.

◆ Short circuit short delay protection
Short-circuit short-time delay protection prevents impedance short circuits in power distribution systems, with the tripping delay designed to achieve selective protection.

Short-circuit short delay protection parameter settings (Table 3)

Short-circuit short delay protection action characteristics (Table 4)

◆ Instant protection
Set parameters for instantaneous short-circuit protection (Table 5)

Instantaneous short-circuit protection characteristics (Table 6)

◆ Autoreclose circuit breaker
When residual current exceeds the set trip current threshold, the circuit breaker will trip. After 20-60 seconds, it can automatically reclose, but manual closing is not time-limited. If the fault current is cleared within 5 seconds after closing, the operation is successful and the breaker resumes normal operation. If the fault current persists, the breaker will trip again and remain locked, preventing automatic reclosing. In such cases, manual closing must be performed.

◆ Overvoltage protection
When the line phase voltage exceeds the overvoltage protection threshold, the circuit breaker trips. Once the voltage returns to normal, the circuit breaker can be manually closed and put back into service. The overvoltage protection setting ranges from 231V to 330V, with a trip time range of 0 to 999 seconds. The factory default settings are 282V and a 2-second trip time, but users can customize or disable the protection as needed.

◆ Undervoltage protection
When the line phase voltage falls below the undervoltage protection threshold, the circuit breaker trips. Once the voltage returns to normal, the circuit breaker can be manually closed and put back into service. The undervoltage protection setting ranges from 101V to 209V, with a trip time range of 0 to 999 seconds. The factory default is 187V with a 2-second trip time, but users can customize or disable the protection as needed.

◆ Phase loss protection
When a phase failure occurs at the power supply end of the line, the circuit breaker protection will trip. Once the line voltage returns to normal, the circuit breaker can be manually closed and put into operation. The phase failure protection setting ranges from 10V to 100V, with the trip time adjustable from 0 to 999 seconds. The factory default settings are 30V with a 2-second trip time, though users may customize or disable the protection as needed.

◆ Characteristic curve
Coordinated protection function
The linkage interface can be used to coordinate protection with the consumption device as follows.

Communication

Outline Overall and Installing Dimensions

Usage and Maintenance

◆ Precautions for unpacking inspection

• Check for any damage to the appearance during transportation, such as shell damage.
• In addition to the switch body, the instruction manual and the certificate of conformity, the packaging box should also have the screws, nuts and accessories for installation and use.

◆ Install and Connect

• Install on a flame-retardant material such as metal;
• The switch can be installed vertically or horizontally.

◆ Maintenance
Maintenance must be carried out by professional technicians. Switch maintenance is carried out once a year under normal operating conditions and once every six months under abnormal conditions. The maintenance contents are as follows:

• Repeat the operation of closing, opening, and tripping the switch. When closing the switch, use the red emergency release button to trip the switch. The operation should be repeated 5 times, and the switch should reliably perform the actions of closing, opening, tripping, and releasing;
• Clean the surface and joints of the switch with a clean, dry cloth;
• Clean the arc shield plate and replace it if necessary;
• Check all connections, wipe off oxides with gauze, clean with a solvent, and tighten bolts and nuts;
• If the switch is equipped with a manual operating mechanism, the switch should be operated three times with the manual operating mechanism, and the operating rod or handle should move freely;
• If the switch is equipped with an electric operating mechanism, the electric operating mechanism shall be used to open and close the switch three times, and the electric operating control function shall be normal.

Transportation and Storage

Transportation
During transportation, the product must be protected from water, rain, snow, or corrosive liquids such as chemical solvents, and from strong impacts between objects. Impact and compression protection; stack according to the packaging instructions, and the number of layers is indicated on the outer box.

Keep in Storage

• Storage environment: ambient temperature -10℃~+45℃;
• Relative humidity ≤90% (at ambient temperature of +20℃);
• The storage place should be free of dust and conductive dust;
• No corrosive, flammable or explosive gases, and no rain or snow invasion;
• Good drying and ventilation;
• Stack the package according to the direction indicated on the package, and do not stack higher than the number marked on the outer packaging box.

Matters Need Attention

• The company shall not be liable for non-quality issues caused by improper installation or usage, or for terminal burnout due to wiring errors, under the "Three Guarantees" policy.
• If you encounter any issues during product use, please contact your local distributor or the company's customer service center.