Function and scope of application
The KHB series SPD backup protector (abbreviated as SCB) is an external current over-current disconnector designed for use in series in a surge protection device (SPD) wiring loop. It utilizes the special structure of the internal current sorting channel to achieve power frequency. The short-circuit current of the small current and the high current of the lightning do not trip, on the one hand to prevent SPD short-circuit failure and fire, on the other hand can withstand greater lightning impulse, so that the SPD continues to play the lightning protection of the power circuit; SCB products Used only for SPD loop over current protection or backup current protection, do not use it in other applications.
According to GB18802.1, GB50057 and other standards, the overcurrent protective device must be connected in series with the SPD circuit on the power line. Since the conventional current fuses and miniature circuit breakers cannot distinguish between the power-frequency current in the power line or the surge lightning current, they cannot be coordinated with the SPD; the large-size current protector is installed irrespective of its size and cannot be worked. When the frequency power supply is abnormal or the SPD degrades quickly and fails, the SPD breaks down and causes fire or even damages the device. The small-size current protector, although small in size, cannot withstand the continuous impact of high-current lightning, which may cause the power supply to use. Damage to the electrical equipment or failure to sustain lightning protection has severely affected the normal operation of the lightning protection system.
In response to the current status of lightning protection equipment and related national standards, the company has developed a KHB series backup protector (SCB) that can be coordinated with a surge protector (SPD) to be connected between a power line and a surge protector. The utility model can not only immediately trip when the power frequency power supply fails or short-circuits in the SPD, and prevents the SPD from generating heat and catches fire; but it can not trip when the lightning current is within the allowable range, so as to achieve the purpose of safe lightning protection.
Specification Model KHB-I-25 KHB-80 KHB-40
Product Category T1 T2 T2
Inrush Current Iemax 25kA(10/350μs) 80kA(8/20μs) 40kA(8/20μs)
Short-circuit breaking capacity Ics 50kA 20kA 20kA
Rated working voltage Ue 230V/400VAC
Rated insulation voltage Ui 400VAC
Power frequency tripping current Ii 3±1A
Load current breaking time To ≤50ms
Mechanical life 1000 times
Shell protection class IP20
Connection cable minimum area 2.5mm2/flexible
Maximum cable connection area 25mm2/flexible
Shell Material PA 66 UL94V-0
Relationship between protection action and ambient temperature -25°C～60°C
Storage environment Temperature: -40°C～75°C Relative humidity: <95%(at 25°C)
Working Environment Temperature: -25°C～60°C Relative Humidity: <95%(at 25°C)
Shell color Shell: Black Handle: Orange
Mounting rail EN60715 (35mm)