China CBRM5EN Primary-Secondary Separated MCCB Circuit Breaker - 400V, 630A, IoT Suppliers and Factory Solutions

CBRM5E Low-voltage intelligent circuit breaker with automatic reclasing

Product Model and Meaning

Scope of Application

The smart IoT circuit breaker features a rated insulation voltage of 1000V, designed for three-phase four-wire power distribution systems; Operating at 50Hz AC with a rated voltage of 400V and rated current up to 630A. It provides indirect contact protection, prevents fire hazards caused by ground fault currents from equipment insulation damage, and distributes electrical energy while protecting circuits against overloads and short circuits. Additionally, it offers protection against line overvoltage, undervoltage, and phase loss.

• GB/T14048.2 "Low-voltage switchgear and control equipment".
• GB/T22710 Electronic Controller for Low Voltage Circuit Breakers.

Main Features and Characteristics

• It employs a high-performance 32-bit ARM microprocessor for real-time signal processing and intelligent control.
• LCD display in Chinese/English, user-friendly interface, easy operation;
• Features automatic reclosing; fast closing speed, with a closing time of ≤2s;
• Three-stage protection, long delay, short delay and instantaneous, using electronic trip, independent of power supply voltage;
• High breaking capacity to ensure the reliability of line short circuit protection;
• Overvoltage protection, undervoltage protection, phase loss protection, zero loss protection, protection functions and parameters can be set and modified online;
• Real-time display of three-phase power supply voltage and load current;
• Identify and display trip types (remote lockout, overload, undervoltage, overvoltage, undervoltage, phase loss, zero-segment break, etc.), and store, query, and delete them.
• Supports four remote functions: remote signaling, telemetry, remote control, and remote adjustment.
• HPLC plug-and-play module with Bluetooth wireless communication for low-power operation;
• 0.05In-1.2In measurement accuracy up to 1.0 grade;
• The parameters such as active power, reactive power, apparent power and power factor are measured in real time, and the three-phase active power is accumulated;
• Time control, cost control and other modes are optional, and the application is more flexible;
• Supports DL/T645 and Modbus protocols with automatic recognition.
• Real-time temperature monitoring of incoming line terminal strips (optional);
• Supports online remote upgrades for easy maintenance and updates;
• Accuracy class: Current and voltage accuracy up to 0.5s class; active and reactive power accuracy up to 1 class;
• Supports active power demand limit, reactive power demand limit, current mutation event, current interruption, voltage harmonic content, current harmonic content, voltage waveform distortion, current waveform distortion;
• Passive island protection (optional);
• Terminal and contact over temperature protection (optional);
• Power generation quality monitoring and protection (optional);
• Three-phase unbalanced monitoring and protection of power generation current (optional).

Service Environment

• The installation site should be free of conductive dust, corrosive gas, flammable and explosive gas, and rain and snow invasion;
• Altitude: not higher than 2000m;
• Ambient temperature: -5℃~+40℃, daily average maximum temperature: ≤+35℃;
• Relative humidity: ≤50% (at ambient temperature of +40℃);
• The strength of the external magnetic field in any direction at the installation site is not more than 5 times that of the geomagnetic field;
• The installation position should have good ventilation and heat dissipation;
• When HPLC (wide band carrier) communication is required, ensure all communication devices operate under a single transformer.

Circuit breaker classification

● Indicates the feature is available; △ indicates the feature is optional; ○ indicates the feature is not available.

Key Technical Specifications

Measurement Accuracy Class

Protection Feature Description

Overload and long delay protection
The circuit breaker shall provide overload and short circuit protection, as well as photovoltaic power generation system island protection and power quality monitoring protection, and all protection functions shall support remote configuration.

1. Long delay setting value (lr) range for over-current

The current setting (lr) ranges from 0.4 to 1In, with OFF indicating the protection function is disabled. The time delay characteristic follows the IEC standard inverse time curve, with K factor=0.14, α factor=0.02, and L factor=0. The current I is set, while Is represents the rated current. TMS setting range: 1-10s. The long delay protection action of over-current should meet the requirements of Table 1.

Table 1: Over-current long delay protection action table

◆ Performance Characteristic

1. Short delay setting value(Isd) range for over current
Short-time operating current(Isd) range: 1.5 to 5Ir, OFF. OFF means the protection function can be disabled. The delay action is time-limited, with a set range of 1-10 seconds. The short delay protection action of overcurrent should meet the requirements of Table 2.

Table 2: Overcurrent short delay protection action table

2. Rated short-circuit current setting (li) range

The rated instantaneous short-circuit current setting (Ii) ranges from 2 to 12Ir, with OFF indicating the protection function is disabled. The circuit breaker current protection operation shall meet the requirements of Table 3.

Table 3: Short circuit current protection action table

3. The three-stage protection characteristic curve is shown below:

◆ Excess Voltage Protection

The overvoltage protection voltage setting (Uov) ranges from 1.05 to 1.5 times the rated voltage (Un). The OFF setting enables the protection function to be disabled. The delay action is time-limited, with the tUov setting range being 1 to 9999 seconds. The over voltage protection operation shall meet the requirements of Table 5.

Table 5: Overvoltage protection action table

◆ Low-voltage Protection

The molded case circuit breaker does not have this feature. The undervoltage protection voltage setting (Uuv) ranges from 0.4 to 0.9sUn. The OFF setting enables or disables this protection function. The delay action is time-limited, with tUuv adjustable from 1 to 9999 seconds. The low voltage protection action shall meet the requirements of Table 6.

Table 6: Under voltage protection action table

◆ Terminal and Contact Over Temperature Protection

The temperature protection setting (Tem) range for terminals and contacts is 80~160°C, with OFF indicating the protection function is disabled. The delay action is time limited, with t Tem set within the range of 1 to 9999 seconds. Terminal and contact over temperature protection action shall meet the requirements of Table 7.

Table 7: Terminal and contact overheating protection action table

◆ Passive Island Protection

The passive detection method primarily identifies islanding status by monitoring the amplitude, frequency, phase, and harmonic content of the inverter's common mode voltage output. Key components include over/under-voltage protection, over/under-frequency protection, phase abrupt change detection, and harmonic detection. The set values for passive island detection criteria are: Voltage amplitude swing(dUisl): 0.1 to 0.9Un, OFF; voltage frequency swing(dFisl): 0.5 to 25Hz, OFF. Voltage phase swing(dPHisl): 1~60, OFF; Voltage waveform distortion rate swing(dUTHDisl): 0.5~30%, OFF. The delay action is time-limited, with the set time tPis adjustable within the range of 0.01 to 9.99 seconds. The passive island protection action shall meet the requirements of Table 8.

Table 8: Passive island protection action table

◆ Power Generation Quality Monitoring and Protection

The power generation harmonic monitoring and protection action shall meet the requirements of Table 9.

Table 9: Current harmonic and protection action comparison table

◆ Three-phase Power Generation Imbalance Monitoring and Protection (applicable to three-phase grid-connected access)

The three-phase unbalanced protection of power generation current shall meet the requirements of Table 10.

Table 10: Negative sequence three-phase current imbalance rate and protection action

◆ Undervoltage Protection

The circuit breaker trips when the phase voltage falls below the undervoltage protection setting. Once the voltage returns to normal, the breaker automatically recloses. The undervoltage protection range is 88V to 209V, with a factory default of 187V. Users can adjust or disable the protection as needed.

◆ Phase Loss Protection

When a phase is missing at the power output of the line, the circuit breaker protection trips. Once the line recovers to normal voltage, it can automatically close and resume operation. The phase loss protection setting ranges from 10V to 130V, with a factory default of 30V. Users can adjust or disable the protection as needed.

◆ Autoreclose Circuit Breaker

After the line voltage exceeds the limit and trips, the line voltage will be automatically reclosed after 5s when the line voltage returns to normal, but the manual closing is not limited by time.

◆ External Control or Dynamic Protection Function

◆ Cost Control

This product can be connected to a fee-controlled meter as an external circuit breaker, compatible with both pulse-type and level-type fee-controlled meters. This feature requires configuring the switch to fee-controlled mode and enabling the "Allow" option. When operating in fee-controlled mode, the automatic protection function is disabled, preventing manual or automatic closing without a fee-controlled signal. Forced closing will automatically disconnect the circuit.

Transportation and Storage

Transportation

• During transportation, protect products from water, rain, snow, or corrosive liquids. Avoid mixing or contact with such substances. Prevent violent impacts or compression between items. Stack products according to packaging directions, with no more than four layers.

Keep in Storage

• Storage environment: ambient temperature -10°C~+45°C
• Relative humidity: ≤90% (at ambient temperature of +20°C)
• The storage place should be free of dust and conductive dust
• No corrosion, flammable and explosive gas, no rain or snow invasion
• Good drying and ventilation
• Stack according to the packaging instructions, not more than 4 layers.

Matters Need Attention

• The company does not assume the "three guarantees" responsibility for non-quality problems caused by improper installation and use and for terminal burnout caused by improper wiring.
• If you encounter any issues during product use, please contact your local distributor or our customer service center.
• Customer service hotline: 86 0577-62793566.