Voltage Switch Level B SPD
Voltage switch B level SPD is usually used in LPZOB LPZ1 zone and in the power supply system. It can eliminate the
continuous current to the utmost extent and conduct the 10/350μs analogy lightning impulse current. when there is no
transient overvoltage,it's in high resistance.while there is transient overvoltage,it's in low resistance and allow
electricity to flow through.This is the working principle.we can provide the "3+0" and "4+0" protection type according to
different power supply system.
KNFB-25 applies in the rating voltage 220V/380V in the low pressure side or LPZ0LPZ1 zone. It protects the first level
lightning or overvoltage.This product is not suitable for the system that prospective short circuit current is higher than
rating current. The front of the product should cascade the insurance fuse. Otherwise, the producing frequency current
may damage the protection devices when products discharge.
KNFB-25/4P
KNFB-25/4P wiring schematic drawing
Technical Parameters
Model | KNFB-25 | |
nominal voltage | Un | 220V |
Max continuous working voltage | Uc | 300v |
Working frequency | 50~60HZ | |
Impulse current | Limp | 25ka |
Limit voltage | Up | ≤1.2kv |
Max. back-up fuse | 125A gl/gG | |
response time | Ta | ≤100ns |
environmental temperature | -40℃~+80℃ | |
Protection level | IP20 | |
Install wire section | Min:10mm2 (single line) MAX:16mm2(single line) 25mm2(Multi line) | |
Installing support | 35MM standard lead rail |
Installation And Maintenance
1.DIN 35MM standard rail installation.
2.The product adopt the flame retardant ABS housing,fix the products,connect the power lines and ground lines by
the drawing,examine and power up.
3.Grounding is very important for the normal work of SPD.the ground contact area is no less than 25 mm2 and as
short as possible.
4.The products don't need special maintenance while it is on position for a long time.So we should assign some
people to examine regularly.Especially in The thunderstorm season.Once stuck,check it Immediately.
5.The product is equipped with a fault indicator.when working normally,the indicator shows green,When this system
malfunctions,it shows red.
6.The internal components are with alternating current,be careful when the system is working.
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