CBRM5EL Compact Automatic Reclosing Circuit Breaker with Residual Current Protection(MCCB)

Product Model and Meaning

Meets standards

The product meets the following standards.
GB/T14048.1-2012 Low voltage switchgear and control equipment Part 1: General principles;
GB/T14048.2-2008 Low-voltage switchgear and control equipment Part 2: Circuit breakers；
GB/T1770 1-2008 <Equipment circuit breakers>.

Main functions and features

Adopt high-performance 32-bit ARM microprocessor, real-time signal processing and intelligent control; LCD Chinese display, user-friendly interface, easy operation;
The residual current (leakage current) protection can be adjusted online, and has the function of reclosing;
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;
Three-stage protection, long delay, short delay and instantaneous, using electronic trip, independent of power supply voltage;
 It has high breaking capacity and ensures the reliability of line short circuit protection. Overvoltage protection, undervoltage protection, phase loss protection;
The residual current of the line, the three-phase power supply voltage and the load current are displayed in real time;
Protective functions and parameters can be set and modified online.
Trip types (residual current, lockout, overload, undervoltage, overvoltage, phase loss) are identified, displayed, and can be stored, queried, and deleted;
The network has communication function, which can realize remote signal, remote measurement, remote control and remote adjustment.
Plug-and-play lightning protection module (optional).
Supports infrared communication (optional).

Key technical specifications

Protection feature description

◆Overload and long delay protection
Action value range
Table 1:Overload Long Delay Parameter Settings

◆Performance characteristic
Table 2: Protection Action Characteristics

◆Time-delay characteristics
The overload protection is based on the inverse time characteristic.
The delay time is calculated as T=(6lrl/l) x L, with a tolerance of+10%.Here,T represents the action time, lrl is the long delay protection setting, i denotes the fault current, and L stands for the long delay time setting.

◆Short circuit short delay protection
Short delay protection prevents impedance short circuit in the power distribution sytem. and the trip delay is to achieve selective protection.Short-circuit short delay protection parameter settings.
Table 3: Short-Circuit Delay Parameter Setting

Short-circuit short delay protection action characteristics
Table 4:Short Delay Action Characteristics of Short Circuit

◆Instant Protection
Set parameters for instantaneous short-circuit protection
Table 5:Instantaneous parameter setting

Instantaneous short-circuit protection characteristics
Table 6:Instantaneous Motion Characteristics

◆Setting range for residual current protection characteristics
Table 7

◆Performance characteristic
Table 8: Protection Action Characteristics

◆Auto mode
In automatic gear mode, the gear values and floating values are:

When the residual current exceeds the floating threshold of a setting without reaching its activation level and remains stable for 60 seconds, the setting is raised by one level. This process continues until reaching the maximum setting. Conversely, when the residual current falls below the floating threshold of the next lower setting and remains stable for 120 seconds, the setting is lowered by one level. This sequence repeats until the minimum setting is reached. Taking the 'Auto 2' setting with an initial residual current of 100mA as an example: When the circuit breaker is energized, the setting automatically resets to 300mA. If the residual current increases above 150mA and remains stable for 60 seconds, the setting changes to 500mA. When the residual current decreases below 150mA and stays stable for 120 seconds, the setting adjusts to 200mA.

◆Autoreclose circuit breaker
When the residual current exceeds the set trip current threshold, the circuit breaker will trip. After 20-60 seconds, it can automatically reclose, though manual reclosing is unrestricted. If the fault current disappears within 5 seconds after reclosing, the operation is successful and the breaker resumes normal operation. If the fault persists, the breaker will trip again and remain locked, preventing automatic reclosing. In such cases, manual reclosing must be performed.

◆Over-voltage protection
When the line phase voltage exceeds the overvoltage protection setting, the circuit breaker trips. Once the voltage returns to normal, the circuit breaker automatically recloses and resumes operation. The overvoltage protection setting ranges from 250V to 300V, with a factory default of 275V. Users can adjust or disable the protection as needed.

◆Undervoltage protection
When the phase voltage falls below the undervoltage protection setting, the circuit breaker trips. Once the voltage returns to normal, the breaker automatically recloses. The undervoltage protection range is 145V to 200V, with a factory default of 145V. Users can adjust or disable the protection as needed.

◆Phase loss protection function
When a phase is missing at the power supply end of the line, the circuit breaker protection trips. When the line is restored to normal voltage, the circuit breaker can be automatically closed and put into operation.

Outline Overall and Installing Dimensions

characteristic curve

◆Linked protection function
The Linkage lnterface Can Be Used to Coordinate With Other Fire Fighting Equipment for Protection as Follows.

Note: Prolonged short-circuiting will keep the circuit breaker in the open state.