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BMKB0 series control and protection switch appliances
● Description
BMKB0 series control and protection switch electrical appliances (CPS) is mainly used in 50 hz, rated voltage 690 v, rated current of 0.25 A - 125 - A in the power system, can be connected, bearing and breaking under normal conditions including the overload of the provisions under the condition of current, and capable of carrying through, and breaking the rules under the condition of abnormal current, such as short circuit current.BMKB0 series of function modules of the control and protection switch electrical equipment or accessories, protective (short circuit protection, overload protection, over-current protection, open phase protection, under- voltage protection) and the control function, etc., which can realize tripping level setting and implementation of motor load (including frequent starting, frequent starting) and distribution load circuit control and protection. With panel indication and electromechanical signal alarm function, with time-current protection characteristics (inverse time limit, fixed time limit and instantaneous three protection characteristics).
● Standards
GB/T 14048.9(IEC60947-6-2) low-voltage switchgear and controlgear -- part 6-2: control and protection of multifunctional electrical (equipment) switchgear (equipment) (CPS) .
BMKBO schematic symbol:
● Normal working conditions
(1) Altitude: the installation site is below 2000m.
(2) Ambient temperature: ambient air temperature - 5 ℃ ~ + 40 ℃, 24-hour average temperature not more than 35 ℃.
(3) Atmospheric conditions: at + 40 ℃, the relative humidity does not exceed 50%; at lower temperature, there can be higher relative humidity; when the monthly average minimum temperature is + 25 ℃, the monthly average maximum relative humidity is 90%. Special measures should be taken for occasional condensation due to temperature.
(4) Pollution level: 3.
(5) Installation category: class III.
● Model definition and labeling
● Installation and use
Before installing the switch, check that the operation knob can operate normally and is in the off position, "auto" is the on state of the main circuit, and "trip" is the free tripping position due to the line fault. The switch can only be operated after the line fault is cleared by the special personnel, "0ff" is the off position of the main circuit, and the free tripping switch can only be operated after the line fault is cleared Only when the operation knob is turned to the "reset" position can it be reset and reset.
Before installing and using the switch, carefully check whether the power supply voltage of the coil and accessories is consistent with the product description and the actual control circuit. When the "0ff" knob is turned to the "0ff" position, the operation is reliable.
The setting value of the action current of the switch release has been set before leaving the factory, and the user can adjust it according to the actual needs.
Bmkbo can continue to operate after breaking the short-circuit current, but it needs to check the switch and confirm the operation status of the switch.
1. Common troubleshooting
2. Installation diagram of switch
3. Outline and installation dimensions
● Basic electrical control diagram
● Matters needing attention
When controlling large power motor (above 11kw), the user should select appropriate step-down starting mode according to the comprehensive consideration of starting torque, current multiple, voltage drop, circuit capacity, etc. the general specification requires that the voltage reduction limit should not exceed 80% of the rated value, and the starting current multiple should not exceed (4-5) times, so as to start normally with appropriate load and meet CPS requirements Reliable action of electromagnet. The exposed part of the external connecting wire at the inlet and outlet of the switch shall be wrapped with insulation.
The products should be protected from rain and snow during transportation and storage. The storage environment should meet the following conditions: daily average temperature is + 25 ℃, relative humidity is not less than 90%, ambient temperature is not higher than + 40 ℃ and not lower than - 5 ℃.
● Description of switch combination product selection
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