SJKM1E-400/3300 Electronic Plastic Shell Circuit Breaker

Scope of application
SJKM1E electronic plastic shell circuit breaker (hereinafter referred to as the circuit breaker) is suitable for AC 50Hz (or 60Hz), with a rated insulation voltage of 800V, a rated working voltage of 400V and below, and a rated working current up to 800A. It is used for infrequent switching and motor starting in circuits. The circuit breaker has overload long delay inverse time limit, short circuit short delay inverse time limit, short circuit short delay fixed time limit short circuit instantaneous and undervoltage protection functions, as well as residual current protection (optional), phase loss protection function (optional), which can protect the line and power equipment from damage. The protection characteristics of the circuit breaker are complete and accurate, which can improve power supply reliability and avoid unnecessary power outages. The "Z, B" type control has a communication interface and can perform "four remote" to meet the requirements of the control center and automation system
Circuit breakers are divided into two types based on their rated ultimate short-circuit breaking capacity: M-type (higher breaking type) and H-type (high breaking type). This circuit breaker has the characteristics of small size, high breaking capacity, short arcing and anti vibration
Circuit breakers can be installed vertically or horizontally
The circuit breaker has an isolation function, and its corresponding symbol is: x
The circuit breaker cannot be reversed, that is, only 1, 3, and 5 are allowed to be connected to the power line, and 2, 4, and 6 are allowed to be connected to the load line

Note:
◆ (1) According to the rated ultimate short-circuit breaking capacity, it is divided into M-type (higher breaking type) and H-type (high breaking type)
(2) Direct operation of the handle without code: electric operation is represented by P, and rotating the handle is represented by Z
◆ (3) Basic type code, represented by Z for intelligent communication type, B for programming communication type, X for fire protection type, and L for LCD display
Environmental conditions for use
◆ Altitude: ≤ 2000m
◆ Environmental temperature: -5 ℃~+40 ° C
◆ Can withstand the influence of humid air
◆ Can withstand the effects of salt spray and oil spray
The installation category of the main circuit of the circuit breaker is III, and the installation category of the other auxiliary circuits and control circuits is II
When the maximum temperature is+40 ℃, the relative humidity of the air should not exceed 50%. Higher relative humidity is allowed at lower humidity levels, and special measures should be taken for occasional condensation caused by temperature changes
The maximum inclination is 22.5 °
◆ In a medium without explosive hazards, and where there is no gas or conductive dust that can corrode metals or damage insulation
In a place without rain or snow invasion
The circuit breaker meets the standard
IEC60947-1 and GB14048.1 General Principles for Low Voltage Switchgear and Control Equipment IEC60947-2 and GB14048.2 "Circuit Breakers for Low Voltage Switchgear and Control Equipment" and Appendix F "Additional Requirements for Circuit Breakers with Electronic Overcurrent Protection"
IEC 60947-5.1 and GB14048.5 "Low voltage switchgear and control gear - Control circuits - Electrical apparatus and switching elements"
Main functions and features
Intelligent controller is the core component of molded case circuit breakers, applied to motor protection or distribution protection, realizing measurement, protection, control and communication functions in one, so as to protect the circuit and power equipment from overload, short circuit, grounding and other fault hazards
◆ Controlled by MCU microprocessor, stable and reliable performance: This intelligent controller can supply power by itself. As long as it is powered on, when the current is not less than 20% of its rated value, it can ensure the normal operation of the protection function
◆ Selective cooperation with three-stage protection: Circuit breakers of Class B and other short-circuit protection devices connected to the same circuit have selective cooperation under short-circuit conditions; Setting of protection function parameters such as overload long delay, inverse time limit, short circuit delay (inverse time limit, timed limit), and short circuit instantaneous
◆ It has three protection parameter settings for action current and action time, which can be adjusted in 4-10 levels: users can adjust the controller according to the load current requirements, or choose to turn off the corresponding function according to user requirements (customized function, to be specified by the user when ordering)
◆ High current instantaneous tripping function: When the circuit breaker is closed or in operation, if a short circuit with high current (≥ 20lnm) is encountered, the magnetic tripping mechanism of the circuit breaker can be directly tripped, providing more reliable and safe dual protection
◆ Equipped with trip testing (test) function: Input DC DC12V voltage test circuit breaker action special note
◆ Fault self diagnosis function: protect and detect the working status and operation of the intelligent controller itself
◆ Equipped with pre alarm indication and overload indication: when the load current reaches or exceeds the set value, the corresponding light guide column will export the light source
Dual air gap technology for magnetic flux converters: more reliable and stable operation, eliminating misoperation, reliable tripping, and low power
High protection accuracy: The action time accuracy of overload protection and short circuit short delay protection is ± 10%; The accuracy of the instantaneous short-circuit protection action value is ± 15% depending on the action current
Installation is interchangeable: The external dimensions and installation dimensions are the same as those of the SJKM1 series molded case circuit breaker with the same specifications and dimensions



Note:
◆ Overload long delay action current Ir1 adjustment, adjustable from 4th to 10th gear according to different rated currents of the circuit breaker
Adjust the long delay action time t1, which can be adjusted to level 4
The short-circuit delay action current lr2 can be adjusted in 10 levels
◆ Short delay action time t2 adjustment, can be adjusted in 4 levels
Short circuit instantaneous action current lr3 adjustment, can be adjusted in 8, 9 or 10 levels
The pre alarm action current lrO can be adjusted in 7 levels
Test end, used for trip testing (experiment)


Electronic release characteristics
◆ Release characteristics
It has protection functions such as overload long delay inverse time limit, short circuit delay inverse time limit, short circuit short delay timed limit, and short circuit instantaneous action, which can be set by the user to form the required protection characteristics; Neutral wire overcurrent protection current, time parameter 100% automatic tracking phase line setting value. The characteristics of the release device are shown in the following figure

Release mechanism and internal accessory code


Note:
The first digit 3 of the release method and internal accessory code indicates an electronic release with three-stage protection; The last two digits represent the internal attachment code, and if there are no attachments, they are represented by 00
The SJKM1E-400 has a 328 specification, while the SJKM1E-600 and 800 have a 348 specification. The auxiliary contacts are a pair of contacts (i.e. one normally open and one normally closed) The 368 specification auxiliary contacts in SJKM1E-400, 630, and 800 have three pairs of contacts (i.e., three normally open and three normally closed); The number of auxiliary contacts for other specifications is two groups of 400 or more and one group of 225 or less
SJKM1E-125 and 250 can provide two pairs of auxiliary contacts (i.e. two normally open and two normally closed) for the 320 specification, but this must be specified when ordering
When internal accessories cannot be provided or meet the customer's usage needs, more auxiliary functions can also be provided through the intelligent controller. This series of intelligent controllers can provide the following functions: closing and opening auxiliary signals
◆ The installation size is the same as SJKM6
Dimensions







Installation and transportation conditions
Installation conditions: Generally, it should be installed vertically or horizontally (horizontally); Installation category: Circuit breaker main circuit class III, control circuit and auxiliary circuit class II; Pollution level: Level 3. ◇ External magnetic field: The external magnetic field near the installation site shall not exceed 5 times the geomagnetic field in any direction.