1. Use and Application Range

CZT Series of Direct Current Electromagnetic Contactor are suitable in D.C. control circuit with voltageD.C.550V or below. Used to make and break circuit .CZT CZT Series of Direct Current Electromagnetic Contactor can even meet such special demands as electric locomotives ,diesel locomotives ,electric motor cars and electric apparatus . CZT Series of Direct Current Electromagnetic Contactor can be widely used in the control of D.C. machines, D.C. Electromagnetic, loops of accumulator jar as well as loops of capacitance etc.

2. Technical Characteristics

CZT series of D.C.contactors, designed with lots of advanced technologies both abroad and at home as well as the consideration of the facts and the levels of technology in our country, are effectively and widely used .The main structures are as follows:
2.1 Electromagnetic System
Type 10,20 and 40 of CZT D.C. contactors are designed with the structures of armoring coil so as to make the pull characteristics flat, moment begin is designed to make sure the flux leakage can be fully used. The electromagnet of CZT-100 is designed with a fashioned iron .The loops of coil are made up of groups of electronic module so as to save energy via.
2.2 Contact system
The major contact is designed as bridge type with two break points increase break points in order to decrease clearance between open contacts. The contacts of CZT-10 and CZT 20 contactors have magnetic piece in the flinks of the "U" fashioned iron so that the arc produced when breaking can be blown and put out in order that the contactors have a long life.
Auxiliary contacts have oblique slip£¬self-friction.When contacts close after make contact meet the fixed contacts, relative sliding friction is produced to make the contactors highly sensitive and reliable. It can be used in the loops with 24V 10mA.
2.3 Arc Extinction system
The arc Extinction of the permanent magnet design is an important part of CZT Series of Direct Current Electromagnetic Contactor. In order to get strong magnetic field strength as well as prevent the damping of magnetic field strong, (ALNiCo8) magnetic steel ,tally:LNGT 60, is used. ALNiCo8 is a kind of material that has good stability and high curie temperature. Type tests and practical tests in which the devices are set in a diesel locomotive and run for 300,000 kilometers (periodic repair) show that the intensity of magnctic field on the surface of magnet steel damps little. With the fixed intensity of magnetic field of permanent magnet, CZT series have solved the problem that the contacts are hard to break when blow-out coil is used for arc Extinction.

3.Main performance index of the contactor

3.1 amount working voltage Ues (form 2)

Form 2

3.2 specified job electric current (form 3)

Form 3

3.3 amount controls the voltage Us of the power

    It is DC110V that the electromagnetic amount of controlling the coil of the contactor controls the voltage Us of the power , the maximum is 121 Vs, the minimum is 88V.

3.4 auxiliary to Auxiliary contact agree on and generate heat electric current Ith

    Electric current Ith is 5 As that the auxiliary agreement of touching the head of the contactor generates heat.

3.5 movement performance

3.5.1 when control the coil contactor electromagnetically in the temperature and the largest hot stable state that control under the voltage of the power of highest ambient air, it sucks the voltage of shutting and is not greater than 80%Us.

The voltage of release of the contactor is not smaller than 5% of the Us on 3.5.2, used in the internal-combustion engine, when the diesel engine is started, the contactor in the control circuit should guarantee that it is the most largly that release the voltage it doesn't exceed 30% of the Us

3.6Give up performance times

3.6.1 Mainly touch putting through and dividing and give up ability of the head on

    Auxiliary contact should bear form 4 stipulate and put through and divide and give up ability test mainly:

Form 4

3.7 electric current ability of tolerance while shorting out     The contactor receives 8 times of specified electric current 10S in conformity with the ability . Should not produce and touch the head to weld , disconnection and the mechanical spare part and insulating one do not have displacement , out of shape with damaging.

3.8 insulating ability The contactor should be able to bear 6 fixed workers of form and test the voltage frequently on 3.8.1

Form 6

3.9 is able to bear damp and hot performance     The contactor is through the high temperature, temperature is 40 degrees Centigrade, after six cycle reversals are tested damp and hotly, insulating resistance its value should ¦¸, 1.5M of ¡Ý,, test voltage have and puncture and flash phenomenon of holding in place with a net frequently in worker.

3.10 antivibration performance     The contactor is in the normal erection site, parting vertical, horizontally , vertical in the vibration frequency of 1-50 HZs, check resonance phenomenon, should be tried to dispel such as the resonance of producing, when can't dispel , in should resonate frequency and his direction vibration 2h, contactor should appear machinery damage, missing movements, the fastener becomes flexible, the phenomenon of bouncing etc. that touch the head

3.11 Electrical Durability
Mainly touch the Electrical Durability of the head under 7 terms of form on 3.11.1     CZT-10, CZT-20, CZT-40 are no less than 600,000 times, CZT-100 is no less than 100,000 times

Form 7

3.11.2 Auxiliary to touch Electrical Durability of head under form 8 terms, move and break, move and shut less than 100,000 in Form 8

Ith(A)	Put through the condition			Divide and give up the condition			Operation frequency Time / h
	U	I	T(ms)	Ur	Ic	I(ms)
5	Ue	0.11th	50	Ue	0.11th	50	600

5.The parameter and appearance are installed to touch the head

   CZT-10 appearance installs

6 products carry out the standard:

GB/14048.1-2000 GB/T14048.4-2003 TB/T1333.1-2002 TB/T1333.2-2002 TB/T2767-1996 Q/12YJ3697-2004