CBRM5K Compact Lockable Molded Case Circuit Breaker (MCCB)

Model and Meaning

Meets Standards

The products conform to the following standards:
GB/T14048.1-2012 Low-voltage switchgear and controlgear - Part 1: General; 
GB/T14048.2-2008 Low-voltage switchgear and controlgear - Part 2: Circuit breakers; GB/T17701-2008 Circuit breakers for equipment.

Main Functions and Features

1.It adopts a high-performance 32-bit ARM microprocessor for real-time signal processing and intelligent control; 
2.The LCD Chinese display provides a user-friendly interface and simple operation; 
3.It features residual current (leakage current) protection with online adjustment of the residual current level and reclosing function; 
4.It monitors and tracks the residual current of the line in real time and automatically adjusts the level to ensure the product's operational rate and reliability;
5.It offers three-stage protection: long-delay, short-delay, and instantaneous, using electronic tripping that is independent of power supply voltage; 
6.It has high breaking capacity to ensure the reliability of line short-circuit protection;
7.Over-voltage protection, under-voltage protection, phase loss protection;
8.Real-time display of line residual current, three-phase power supply voltage, and load current; 9.Protection functions and parameters can be set and modified online;
10.The tripping type (residual current, lockout, overload, undervoltage, overvoltage, phase loss) can be identified, displayed, stored, queried, and deleted;
11.Network-type models have communication capabilities, enabling remote signaling, telemetry, remote control, and remote adjustment;
12.Pluggable surge protection modules (optional) ;
13.feature infrared communication (optional).

Main Technical Parameters

Protection Features Description

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

◆Action characteristics
Table 2: Protective Action Characteristics

◆Delay characteristics
Overload protection operates based on inverse time characteristics:
T=(6Ir1/I)2tL Delay accuracy: ±10% Where T is the action time value, lr1 is the long delay protection setting value, I is the fault current, and TL is the long delay time setting value.

◆Short circuit short delay protection
Short-circuit short-delay protection prevents impedance short circuits in power distribution systems, and the tripping delay is for selective protection. Short-circuit short-delay protection parameter settings.
Table 3: Short-circuit short-delay parameter settings

Short-circuit short-delay protection operation characteristics
Table 4: Short-circuit short-delay action characteristics

◆Instantaneous protection Short-circuit instantaneous protection related parameter settings

Table 5: Instantaneous Parameter Settings

Short circuit instantaneous protection operation characteristics

Table 6: Instantaneous motion characteristics

◆Residual current protection characteristics

Gear setting range

External Shape and Installation Dimensions

Note: The auxiliary contact is on the left and the surge protection module is on the right in the diagram; the dimensions of the accessories are the same for all models.

Characteristic Curves