CQM5L series Residual Current Circuit Breaker

Scope of application and use

CQM5L series residual current protection circuit breaker(CBR) (here in after referred to as circuit breaker) is a distribution protection device that suitable for AC 50Hz/60Hz,rated operating voltage up to AC415V,rated operating current up to 630A.It also can be used for motor infrequent startup. The circuit breaker has overload,short circuit and low voltage protection which can protect circuit and power equipment from damage in line fault,along with ground-faults that caused by long-standing butun-detecting of over current protection device,to prevent the circuit hazard which will been dangering personal safety and causing fire.

Structural characteristics of

Enhanced safety design

The circuit breaker has small size, high breaking capacity, short flash over distance,vibration resistance and so on.

The circuit breaker can be installed quickly with box-type accessories, and the accessories can be added timely according to the user's on-site requirements.

The residual current protection device of the circuit breaker works with the self-loop three-phase power supply.If any phase is missing, the residual current protection device can still work normally.

The parameters can be adjusted on site: the rated residual current is adjustable in three grades (or four grades);The delay time is adjustable in three grades.

Leakage tripping indicator function: the leakage tripping indicator button will pop up when the circuit breaker breaks due to leakage fault.

Applicable for wide range of power supply:the circuit breaker can be used in the workplace of three-phase power supply or single-phase power supply(connected with A/C phase).

Execution standard

GB/T14048.1-2012 Low-voltage switchgear and controlgear-Part 1:General rules

GB/T14048.2-2020 Low-voltage switchgear and controlgear-Part 2:Circuit-breakers

IEC 60947-1 Low-voltage switchgear and controlgear-Part 1:General rules

IEC 60947-2 Low-voltage switchgear and controlgear-Part 2:Circuit-breakers

Model and Meaning

1.CQ: Enterprise code (Zhejiang Chuangqi Electric Co., LTD.)

2.M: Molded case circuit breaker

3.5:Design serial number

4.L: Derived code (Residual current protection function)

5.125: Rated current offrame grade (A)-125/250/400/630

6.□: Operation mode code (no code -manual direct operation,Z-rotating handle operation,P-electric operation)

7.4: Pole numbercode (3-tripole,4-quadrupole)

8.300: Trip type and accessories code;3:compound trip;2: single magnetictrip;

9.□: Usage code (no code-distribution type, 2-motor protection type)

10.B: N-pole type of 4P products (type A, B, C, D, no code for 3-pole products)

Type A: N pole is always connected and no over current release is installed;

Type B: N pole breaks together with other poles and no over current release is installed;

Type C: N pole breaks with other poles and over current release is installed;

Type D: N pole is always connected and over current release is installed.

11.125A: Rated current (see technical parametertable)

12.Y: Delaytype.Y-delay type,F-non-delay type.

13.□: Wiring code (no code-board front wiring;B-board rearwiring;C-Plug-in)

Technical parameters

specifications		CQM5L-125		CQM5L-250		CQM5L-400		CQM5L-630
Rated current In(A),40°C		16/20/25/32/40/50/63/80/ 100/125		100/125/140/160/180/200/ 225/250		225/250/315/350/400		400/500/630
Rated operating voltage		AC380/400/415		AC380/400/415		AC380/400/415		AC380/400/415
Phase spacing		30		35		48		70
Outline dimensions	Length	155		165		257		280
	wide (3P/4P)	90/120		105/140		150/198		210/280
	Height	87		100		104.5		112
Rated insulation voltage Ui(V)		1000		1000		1000		1000
Rated impulse withstand voltage Uimp(kV)		8		8		8		8
Tripping type		Thermal magnetic type		Thermal magnetic type		Thermal magnetic type		Thermal magnetic type
Utilization category		A		A		A		A
Mechanical life		20000		20000		10000		10000
Electrical life [AC415V]		8000		8000		7000		7000
Poles		3P	4P	3P	4P	3P	4P	3P	4P
Rated ultimate short-circuit breaking capacity(kA)(AC380/400/415V)		70		70		70		70
Rated operating short-circuit breaking capacity(kA)(AC380/400/415V)		50		50		70		70
Ratedresidual operating current	delay+no delay	100/300/500		100/300/500		100/300/500/1000		100/300/500/1000
	no delay	30/100/300/500		/		/		/
Rated residual operating current type		AC type		AC type		AC type		AC type
Rated residual short-circuit connection and breaking capacity		1/4Icu		1/4Icu		1/4Icu		1/4Icu
Flashover distance(mm)		≤50				≤100
Applicable working environment temperature		-35℃~+70℃
Instantaneous protection type	Power distribution protection	In≤40A:400A;In≥50A:10In		10In		10In		10In
	Motor protection	In≤40A:400A;In≥50A:12In		12ln		12ln		12ln

Attached is the code comparison table

Appearance and installation dimensions

Board front wiring dimensions

X-X、Y-Y are the center of 3P circuit breaker

CQM5L-125 

CQM5L-250

CQM5L-400

CQM5L-630

Note: The unmarked tolerance class is according to GB/T 1804-C.