Scope of application

DZM1 series molded case circuit breaker (hereinafter referred to as circuit breaker) is one of the new types of circuit breakers developed and designed by the Company using advanced international design and manufacturing technology. The rated insulation voltage is 800 V (500 V for DZM1-63). The circuit breaker is suitable for AC 50 Hz circuits with a rated operating voltage of 690 V and below (400 V for DZM1-63) and a rated operating current up to 1250 A, and can also be used for infrequent switching of the circuit and infrequent starting of the motor. It has overload, short circuit, and undervoltage protection functions, which can protect the circuit and power supply equipment from damage.

The circuit breaker is categorized into three types based on their rated limit short-circuit breaking capacity (Icu): L-type (standard type), M-type (moderately high breaking type), and H-type (high breaking type). The circuit breaker has characteristics such as a small size, high breaking capacity, short arc (zero arc for some specifications), and resistance to vibration, making it an 

ideal product for use on land and ships. It can provide protection service between upper and lower levels, featuring three-stage protection functions.

The circuit breaker can be installed vertically (upright) or horizontally (flat).

The circuit breaker cannot be back-fed, meaning only terminals 1, 3, and 5 should be connected to the power supply, and terminals 2, 4, and 6 should be connected to the load.

The circuit breaker has an isolation function, and its corresponding symbol is: .——/*

The circuit breaker product complies with the following standards:

IEC60947-1 and GB/14048.1 Low-voltage Switchgear and Controlgear - General Rules

IEC60942-2 and GB/14048.2 Low-voltage Switchgear and Controlgear - Circuit-breakers

IEC60947-4 and GB/14048.4 Low-voltage Switchgear and Controlgear, Control Circuit Devices and Switch Components Part 1:

Contactors and Motor-starters

IEC609457-5.1 and GB14048.5 Low-voltage Switchgear and Controlgear, Control Circuit Devices and Switch Components Part 1:

Electromechanical Control Circuit Devices

Model Number and Meaning

Note:

1) Circuit breakers for distribution have no code; circuit breakers for motor protection are indicated by the number 2.

2) Direct operation without code: "P" represents electric operation; "Z" represents rotating handle operation.

Applicable working environment

● Altitude 2000 m and below;

● The ambient medium temperature should not exceed +40℃ (+45℃ for marine products) and should not be lower than -5℃ , and it should be able to withstand the effects of humid air;

● Able to withstand the effects of salt spray and oil mist;

● Able to withstand the effects of mold;

● Able to withstand the effects of nuclear radiation;

● Maximum inclination of ±22.5°, able to operate reliably under normal ship vibrations;

● Able to reliably operate under seismic conditions (4g);

● In mediums without explosive hazards, and in places where the medium is not sufficient to corrode metal or damage insulation 

due to gases and conductive dust;

● In places where there is no rain or snow.

The products are classified by the number of poles into two poles (DZM1-125, 160, 250), three poles, and four poles. The types of 

the neutral pole (N pole) in four-pole products are divided into four categories:

● Type A: The N pole is not equipped with an overcurrent release and is always connected, not making and breaking in 

conjunction with the other three poles;

● Type B: The N pole is not equipped with an overcurrent release, and the N pole makes and breaks in conjunction with the other 

three poles (N pole closes first and breaks last).

● Type C: The N pole is equipped with an overcurrent release, and the neutral pole (N) makes and breaks in conjunction with the 

other three poles (N pole closes first and breaks last).

● Type D: The N pole is equipped with an overcurrent release and is always connected, not making and breaking in conjunction 

with the other three poles.

● Divided by rated current (A):

DZM1-63 is available in nine levels: (6), 10, 16, 20, 25, 32, 40, 50, and 63 A (6 A specification without overload protection);

DZM1-125 is available in seven levels: 32, 40, 50, 63, 80, and 125 A;

DZM1-160 is available in four levels: 100, 125, 140, and 160 A;

DZM1-225 is available in seven levels: 100, 125, 140, 160, 180, 200, and 225 A;

DZM1-250 is available in seven levels: 125, 140, 160, 180, 200, 225, and 250 A;

DZM1-400 is available in five levels: 225, 250, 315, 350, and 400 A;

DZM1-630 is available in three levels: 400, 500, and 630 A;

DZM1-800 is available in three levels: 630, 700, and 800 A;

DZM1-1250 is available in three levels: 800, 1000, and 1250 A.

● The wiring methods of products are divided into three types: front wiring, back wiring, and plug-in wiring.

● According to the type of overcurrent release, the products can be divided into two types: thermal-magnetic (composite) type and 

electromagnetic (instantaneous) type.

● According to accessories, the products can be divided into two types: those with accessories and those without accessories.

Dimension and installation dimension

External accessories of circuit breaker

A. Applicable to the circuit of AC 50Hz-60Hz, rated working voltage 690V and below, rated working current from 12.5A to 1250A for electric power distribution, with overload, short-circuit and undervoltage protection function.

B. It is divided into thermal magnetic type and electronic type.