CBRM3EL Automatic Reclosing Circuit Breaker with Residual Current Protection (Metering MCCB)

Model and Meaning

Main Functions and Features

◆Adopt high-performance 32-bit ARM microprocessor, real-time signal processing and intelligent control;
◆LCD display in Chinese/English, user-friendly interface, easy operation;
◆The residual current (leakage) protection can be adjusted online, and the residual current level 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；
◆Over-voltage protection,under-voltage protection, phase loss protection, and zero 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, and power factor；
◆Trip types (residual current, lockout, overload,phase loss,zero-segment break，etc,) can be identified,displayed, stored, queried. and deleted；
◆Supports four remote functions.telemetry,telemetering remote control. and remote adjustment；features HPLC plug-and-play modules and low-power Bluetooth wireless communication；
◆0.05In-1.2In metering accuracy up to 1.0 class, real-time temperature monitoring of incoming line terminal blocks (optional).
◆Accumulate three-phase active power,optional time control and fee control modes for better application flexibility；
◆Supports DL/T645 and Modbus protocols with automatic recognition, enables online remote upgrades for easier maintenance；
◆Accuracy class: current and voltage accuracy up to 0.5s class, active and reactive power accuracy up to 1 class, residual current up to 2 class.

Circuit Breaker Classification and Functions

●Indicates the feature is available, △ indicates the feature is optional:○ indicates the feature is not available

Measurement Accuracy Class

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 T is calculated as(6Irl/l）2tl, with a tolerance of ±10%.Here,T represents the action time, Irl is the long delay protection setting, I denotes the fault current, and tl, is the long delay time setting.

◆Short circuit short delay protection

Short delay protection prevents impedance short circuit in the power distribution system, 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

Short-circuit instantaneous protection action 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.

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 reaching the minimum setting. Taking the 'Automatic 2" setting with an initial residual current of 100mA as an example: When the circuit breaker is energized,the setting automatically resets to 300mAIf the residual current increases to over 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 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 curent 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 over-voltage protection setting, the circuit breaker trips. Once the voltage returns to normal, the circuit breaker automatically recloses and resumes operation. The over-voltage protection range is 231V to 330V, with a factory default of 275v. Users can adjust or disable the protection as needed.

◆Under-voltage protection
The circuit breaker rips when the phase voltage falls below the under-voltage protection setting. Once the voltage returns to normal, the breaker automatically recloses. The under-voltage protection range is 88V to 209v, with a factory default of 145v, Users can adjust or disable the protection as needed.

◆Phase loss protection
When a phase is missing at the power supply end of the line, the circuit breaker protection trips. After the line recovers to normal voltage, it can be automatically closed and put into operation. The setting range of phase loss protection is 10V~130V, and the factory setting is 30V. Users can set or disable the protection themselves.

◆Linked Protection
The linkage inter face 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.

◆Cost control protection
This product can be connected to a fee-controlled meter as an external circuit breaker, compatible with both pule-type and level-type fee-controlled meters. To activate this feature, the switch must be configured in fee-controlled mode and the interlock permission must be enabled. When operating in fee-controlled mode, the interlock protection function automatically deactivates. Manual or automatic closing cannot be per formed without a fee-controlled signal from the meter. Forced closing will trigger an automatic disconnection.

◆Time control protection
This product is designed for scenarios requiring timed operation, such as smart street lighting systems and campus energy management solutions. When operating in time-controlled mode, users can configure stat and end times for circuit closure. The device supports four preset time windows. During these periods, it automatically closes the circuit if no faults are detected. In case of safety issues (e.g., over-voltage, under-voltage, or leakage current), the system activates protective measures and reopens automatically after conditions improve. Outside these windows, the device automatically locks out. For emergency power supply during such periods, users must switch to normal operation mode before closing the circuit. Failure to do so will trigger automatic disconnection.

Characteristic Curve

Outline Overall and Installing Dimensions

Reclosing plug-in type shape and installation dimensions

Installation dimensions