SJKW17 Universal Circuit Breaker

Scope of application
SJKW17 universal circuit breaker is suitable for distribution networks with AC voltage of 400V (380V), 690V (660V), 50Hz, and rated working current up to 3900A. It is used to distribute electrical energy and protect lines and power equipment from overload, undervoltage, short circuit and other hazards. Under normal conditions, it can also be used for infrequent conversion of lines
Compliant with standards: GB14048.2, IEC 60947-2
Normal working conditions and installation conditions
The ambient air temperature is -5 ° C~+40 ° C, and the average value over 24 hours does not exceed+35C
Installation location: sea level not exceeding 2000m
◆ Atmospheric conditions: The relative humidity of the atmosphere should not exceed 50% when the ambient air temperature is+40 ℃, and there may be higher relative humidity at lower temperatures; The average maximum relative humidity of the wettest month is 90% At the same time, the monthly average minimum temperature for that month is+25 ℃, taking into account the condensation on the surface of the product caused by temperature changes
Pollution level: Level 3
Installation conditions: The circuit breaker should be installed as a complete set according to the instructions or installed separately indoors, with a tilt angle of no more than 5 ° from the vertical plane



◆ Installation, use, and maintenance
Before installation, check the insulation resistance of the circuit breaker with a 1000V megohmmeter. When the ambient medium temperature is 20 ℃± 5 ℃ and the relative humidity is 50%~70%, it should not be less than 10M Ω. Otherwise, it should be treated and the insulation resistance should meet the requirements before use
Before installation, check whether the specifications of the circuit breaker meet the requirements
Check that there is no jamming or rubbing between the movable parts of the circuit breaker and the parts of the arc extinguishing chamber during the closing and opening process. And the indicator sign can correctly indicate the working status of the circuit breaker. (After installing the arc extinguishing cover, there should be no gap between it and the installation base)
When installing a fixed circuit breaker, its base should be in a vertical to horizontal position and fixed with mounting screws. At the same time, it must be reliably grounded, and there is a symbol mark at the grounding screw; Before using a drawer type circuit breaker, it is necessary to check whether the insulation board on the secondary circuit of the drawer seat has fallen off
During installation, the safety distance of circuit breakers should be considered, especially the arcing distance of fixed circuit breakers must be ensured
The installation surface of the circuit breaker must be flat
◆ Check whether the shunt release and undervoltage release operate normally. Then, under the condition of undervoltage release being engaged, the circuit breaker should be reliably closed by manual or electric operation. When using the shunt release or undervoltage release or manual release, the circuit breaker should be reliably opened and subjected to five operation inspections
When abnormal noise is found in the iron core during use, the anti rust oil on the working electrode surface should be wiped clean
Circuit breakers should be regularly maintained a. Clean up dust to maintain good insulation of the circuit breaker
b. Add lubricating oil to each rotating or sliding part
c. Check the setting values, action values, and operation process of various release devices
d. Check the contact system:
Wipe off the smoke marks on the contact, and if small metal particles are found on the contact surface of the contact, they should be removed. If the thickness of the silver alloy contact is as small as 1mm, the contact must be replaced
After the circuit breaker is subjected to short-circuit current, in addition to checking the contact system, it is necessary to clean the smoke marks on the inner wall of the arc extinguishing cover; If the arc extinguishing grid is severely burned, the arc extinguishing cover should be replaced
The busbar connecting the main circuit terminal of the circuit breaker should be fixed with insulation at a distance of (200-250) mm from the terminal to prevent damage caused by electric force
Appearance and installation dimensions
The appearance and installation dimensions of the three pole fixed circuit breaker (the safety distance of the circuit breaker is shown in Table 7) (the door hole size is shown in the drawer diagram)
SJKW17-1900 fixed type (see Figure 1, Figure 2, Figure 3)