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DZ15LD Molded Case Circuit Breaker (submersible pump protection, electric motor circuit breaker, phase-failure protection switch, three-phase motor phase protection) for the use of industrial and agricultural provide more efficient and safe protection, the relative protection of the motor technology is mature, agricultural production and distribution often motor burned, according to "electronic newspaper" authoritative data statistics, every year a large number of motors were burned, due to phase failure, short circuit burned more than 95%, resulting in a large number of motor repair, resulting in waste of human and material resources. Rural users generally use a knife and thermal relay protection, there is no reliable submersible pump protection device.
In order to solve the above problems, after many years of research and market research, Taixi Electric has developed an economic and practical submersible pump protection (electric motor circuit breaker) to protect the DZ15D and DZ15LD products against the phase failure of the motor (such as pumps, submersible pumps , Grinding machines, fans, and other electrical products).

Scope of Application

DZ15LD electric motor circuit breaker (also known as: submersible pump protection switch / open-phase protection switch / motor protection circuit breaker), is circuit breaker with three lights display to indicate default phase, over-current, fault, mainly applies to the circuit with rated current of 100A, rated current of 100A for distribution, rated current up to 100A for short-citcuit protection, and electric motor circuit breaker protects against fault caused by default phase of equipment and over-current, and submersible pump protection also protects motor in normal circumstances. Leakage default phase protector can be used in the circuits of infrequent conversion and the motor of infrequent use. Electric motor circuit breaker can provide indirect electric shock protection for people, and prevent the fire hazard caused by ground fault current from the damaged device insulation.
DZ15LD electric motor circuit breaker in the distribution network as the distributing power , the circuits and motor to protect overload, short circuit, default phase and over-current.
LV Circuit Breaker meet the IEC60947-2: 2006 national standards and GB140848.2-2008 standards.

Model and meaning

Normal operating conditions and installation conditions

■ The altitude of the installation site is not more than 2000m
■ Ambient air temperature: -5℃~40℃, and average temperature in 24h is below +35℃.
■ The air relative humidity in the highest temperature + 40℃ for not more than 50%; In the low temperature can have higher relative humidity. The maximum average relative humidity is 90%, while the average monthly minimum temperature is +25℃, and consider the temperature changes in product on the surface of the gel.
■ Circuit breakers can not be installed in the environment with explosive gas;
■ Circuit breakers can not be installed in place where the metal will be corroded;
■ Circuit breakers can not be installed in the place with vibration of more than 5g;
■ Installation category: Ⅲ.
■ Pollution degree: 2.
■ The external magnetic field in the vicinity of the installation site does not exceed 5 times the geomagnetic field in any direction.

The main function

1, Default phase protection 2, Leakage protection 3, Over-current protection 4, Locked rotor protection 5, Three-phase imbalance 6, Short-circuit protection 7, anti-interference protection

The main feature

1, The circuit breaker has default phase and open-phase protection instructions, over-current and overload indication, the work breakdown indication of the residual leakage and default phase protection circuit breakers.
2, The circuit breaker has advanced electronic trip system to replace the tripping method of old bimetal and oil cup, to solve the question about over-current stability, feasibility.
3, The circuit breaker has a fault display function, high breaking capacity, high sensitivity, high protection of over-current and default phase.


Regardless of high-voltage drop-out fuse, or low-voltage fuse blown, the motor winding phase caused by the lack of electricity phase protection are reliably played a protective action, open-phase action time is less than 3s. In the modern industrial production process, due to three and power phase, phase loss caused by motor burned to become one of the main motor damage. Especially in some automatic control circuit, a large number of use of AC contactor, AC contactor used for some time, contact damage caused by "missing phase", resulting in the phenomenon of motor damage is not uncommon. Therefore, the three power phase, phase protection has become a hot topic for people to study.
In the actual work of the Company, according to the working principle of three-phase AC motor, motor damage caused by the development of the main reasons. They are a unique design, reliable and easy installation of multi-function protector. In the event of failure, timely cut off the power to achieve motor protection. In addition to the protection of the "AC contactor phase loss" protection, but also a good power grid phase protection, overload protection, overvoltage protection. Is the thermal relay of the electronic motor protection of the replacement of new products. This series of products with several models, the market appears on the motor integrated protector, this protector can not load in the state (the motor is not connected) to the phase after the action. But the actual phase-failure protection refers to the interruption of the motor phase can play a protective role. No motor running, what is off with the protection! Once connected to the motor, regardless of the power phase in operation, or the contactor is bad contact phase, running the motor is still in the phase to continue to run. Will not achieve protection.

The main technical parameters

Operating voltage: 220V ~ 400V
Frequency: 50 Hz
Rated current: 10-100A
Over-current protection: motor main circuit load current is bigger than 12 times the rated current, the protection action time is less than 60s, and has good inverse time selectivity, The user can adjust by themselves according to the load current, regulating device are set on the panel;
Default phase protection: the main circuit is any phase power-off protection, breaking time is less than 2s;
Power adjustable: 40A: 1.1KW ~ 11KW; 100A: 11KW ~ 30KW.

Outline and installation dimensions



DZ15D-390/40A 78 195 76 90
DZ15D-390/100A 95 205 76 90
DZ15LD-390/40A 78 221 80 95
DZ15LD-390/100A 95 251 80 95
Rated current(A) 6 10 16 20 25 32 40 50 63 80 100
Copper wire cross-sectional area(mm²) 1.0 1.5 2.5 2.5 4 6 10 10 16 25 35

Keywords: submersible pump protection,Electric motor Circuit Breaker

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