BXB4-800/1140(660) Mining explosion-proof low-voltage protection boxDetailed product description：

BXB4-800/1140 (660) Mining Explosion proof Low Voltage Protection Box Model and Its Meaning




Scope and Application
BXB4-800/1140 (660) mining explosion-proof low-voltage protection box is suitable for coal mines with methane and coal dust explosion hazards. It is installed on the low-voltage side of mobile substations and can be used in conjunction with BGP51-6KV, 10KV mining explosion-proof high-voltage vacuum distribution devices produced by our factory. It is suitable for matching dry-type transformers and high-voltage distribution devices with capacities of 315, 500, 630, 800, 1000, 1250, 1500, 1600kVA, etc. It can achieve protection functions such as leakage, leakage lockout, short circuit, overload, overvoltage, undervoltage, etc. for power supply lines and electrical equipment. This protective box can also be used for 660V voltage systems.  

Main features
1. This protective box adopts advanced technology microcomputer comprehensive protector, which improves the reliability of the entire system. The data is displayed in Chinese, which is intuitive and concise;
2. Low voltage side fault jumps to high voltage operation mode;
3. There is a reliable electrical and mechanical interlock between the gate and the isolation switch;
4. It has protection functions such as leakage, leakage lockout, short circuit, overload, overvoltage, undervoltage, etc.  

BXB4-800/1140 (660) Mine Explosion proof Low Voltage Protection Box Main Technical Parameters:

Rated working voltage (Ve) Maximum operating voltage Rated operating frequency Rated current of main circuit (I)e) Rated current of branch circuit (V) (V) (Hz) (A) (A)

1140, 660 1200, 690 fifty five hundred three hundred

1140, 660 1200, 690 fifty six hundred and thirty three hundred and fifteen

1140, 660 1200, 690 fifty eight hundred four hundred

Protection function	Parameters and tuning
short circuit protection overload protection earth leakage protection (Single phase) Undervoltage protection Overvoltage protection Action time (S)	Set current Iz 1-10 times IeStep size=1 Set current Iz 0.4~1.2 times IeStep size=0.2 system voltage 1140V 660V U>70%Ue U>125%Ue ≤1.05Iz ∞ Leakage resistance 20KΩ 11K U>70%Ue U>125%Ue 1.2Iz <120 Locking resistor 40KΩ 22K ≤0.1 ≤0.1 1.5Iz <60 Locking resistor 40KΩ 22K ≤0.1 ≤0.1 2Iz <20	Action time (S) 1.2 times Iet＜0.1 Action time (S) Action time (S) Action time (S) ≤0.1 ≤0.1 ≤0.1 ≤0.1 6Iz Return time>8
Note: The action value error of all the above protections is ≤± 5%