Power gap lightning protection device - LZA-30A,LZA-50A

Application range
LZA-30A/50A are applied to equipotential bonding of the low voltage side of transformer or main low voltage distribution boxes inside the building, providing protection against the overvoltage arising fromthe lightning strike to power supply system of class I or faulty operation,but they are not applied to the systemof the expected short-circuit current beyond rated breaking afterflow current. The series fuse must be at the front-end of the product, otherwise, the surge protector may be burned out by the developed power flowcurrent, while the product is discharging.(option from standard IEC61643-1 and GB50343)
Main structure and work principle.
The two electrodes are connected to the line L (or line N) and line PE respectively. An electric gap is formed between the two electrodes. The high-impedance state exists between the two electrodes when the electric network runs under the striking voltage. If the voltage between the two electrodes surpasses the striking voltage arising fromthe lightning or faulty operation on the electric network, arc through the electric gap and power energy releases through arc discharge. The arc will be extinguished by the arc quenching system consisting of detached arc slices and arc quenching roomand the electric gap resumes to high-impedance state. The discharge gap is totally-enclosed and No arc escape.
Main technical data
Type LZA-30A LZA-50A
Impulsive discharge current Iimp (10/350) kA 30 50
Rated Load Voltage Un V 230
Max. continuous AC Voltage Uc 255
Voltage protection level Up KV ＜0.8
Ability of anti-short-circuit of the Max. backup fuse 50kA
Rated breaking afterflow current 3kA
Insulation resistance ＞5MΩ
Response time ns ＜100
Compound mode 1P、2P、3P、4P
Enclosure material enhanced flame retardant nylon (light gray ,flame retardancy:V0)
Max. backup fuse/airbreak switch 250A gL
Cross-sectional area(max) ≥16mm2 stranded/flexible
Ordering description
Type/assemblage Type/assemblage
LZA-30A/1P LZA-50A/1P
LZA-30A/2P LZA-50A/2P
LZA-30A/3P LZA-50A/3P
LZA-30A/4P LZA-50A/4P