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AC contactor and molded case circuit breaker
Time:2017-07-20 09:55:04    Page view (502)
Often on the Internet to see a lot of friends to ask this question, they always do not know the role of contactors and circuit breakers, but also often used as a comparison for comparison, in fact, this is two completely different low-voltage electrical products. Today we are on the circuit breaker and contactor function to communicate with you.
The function and function of the contactor:
AC contactor (or DC contactor) is a long-distance frequent or infrequent connection and breaking the main circuit and large-capacity control circuit of the electrical appliances. It is used as a control AC (DC) induction motor to start, stop, reverse, speed, and with thermal relay or other appropriate protection device combination to protect the motor may occur overload or phase failure can also be used to control other power load Such as capacitors, electric lighting, welding machines, capacitors and so on.
Performance requirements
1, the amount of working voltage, the amount of working current,
AC contactor of the main contact of the rated operating voltage are: 220,380,660,1140 V;
Auxiliary contact rated operating voltage are: AC 380V, DC 220V;
AC contactor rated operating current according to R5 series are: 6.3A, 10A, 16,25,40,63,100,160,250,400,630,1000,1600,2500,4000A.
Rated working system
AC contactors have the following four working systems:
(1) Intermittent long-term wage system: (8 hours wage system) This wage system for the basic work system, according to the contactor heating current Ith determined by this wage system.
(2) Uninterrupted Wage System: Under this wage system, the main contact of the contactor remains closed and carries a stable current for more than 8 hours (eg, several weeks, months or even years).
(3) Intermittent cycle wage system: intermittent cycle wage system operating frequency and power continuity by the product standards.
(4) short-term wage system: short-term wage system standard contact time is divided into 10,30,60 and 90min.
Operating frequency
Operating frequency is one of the main technical indicators of the contactor, it is with the product life, the amount of working current and so on. AC contactor operating frequency is generally 300 to 1200 times / hour.
Circuit breaker (molded case circuit breaker) the role and function:
use:
Under normal circumstances, close or disconnect the power supply circuit to achieve power outage, power supply and conversion circuit purposes.
When the grid is not normal, such as overload, loss of pressure, undervoltage, short circuit, etc., can automatically disconnect the load from the grid. Because these abnormal conditions will endanger the safety of the operator or the normal operation of the equipment, and even cause a personal death accident or cause a fire.
Classification and main use of circuit breakers
Power supply circuit breakers: general communication 200 ~ 4000A; protection features have two sections of protection and three sections of protection, limited flow lines and general type, two and three sections of protection with instantaneous, short delay, long delay function. Current limiting lines and general types have long delay and instantaneous functions.
Main use: two and three sections as the main switch and branch of the power supply near the power switch; limiting line and general type as a branch near the power switch and branch end switch.
DC circuit breakers for distribution:
Fast type: there are non-polar and very polar; the main purpose as a protective rectifier equipment;
General type: long delay and instantaneous function, the main purpose is to protect the general DC equipment.
Motor protection circuit breakers
Generally used for the exchange of 63 ~ 630A. Direct start type and indirect start type.
Direct start type: direct start type is divided into general type and current limiting type, general type over-current release instantaneous rotation factor of 8 to 15 times, mainly as a protective cage motor.
Current limiting type overcurrent release instantaneous multiple of 12 times the main role of protection cage motor.
Indirect start type: over-current release instantaneous rotation factor of 3 to 8 times, mainly as a protective cage and winding motor.
Conductor Protection Circuit Breaker: Suitable for AC 6 ~ 125A, with overload long delay short circuit instantaneous function. The main purpose of the unipolar or three for the life of the building and the signal secondary circuit.
Leakage protection circuit breaker: for AC 20 ~ 63A. Leakage action sensitivity according to the purpose of different sub-file, the main purpose is to ensure personal safety to prevent leakage of fire.
Special purpose circuit breakers: for AC and DC, according to special requirements, the main purpose as a demagnetization switch closed switch.
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