Gas Tube Arrestors
MY7 AC SPD Fire and Corrosion 20KA-40KA 1P ~ 275V House Surge Protector Protection Device Low Voltage Arrester1-MY7Series Introduction
MY7 series UL/CUL certified surge protectors offer reliable voltage protection levels, superior surge current discharge capacity and safe overload characteristics.There are two types: T2(AC) and T4(DC,PV). protection for photovoltaic, dc, wind and ac low voltage distribution systems.MY7 series UL/CUL certified surge protector USES high energy MOV chip, nanosecond response speed.The combination method is flexible and convenient, and the protection function is safe and reliable.The product conforms to UL1449.2010 standard.
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2-Technical Date
TYPE: MY7
Protection Class: C
Working Voltage: ~220V
Max.Continuous Operating Voltage (Uc): ~275V
Nominal Discharge Current (8/20s) (In): 20KA
Max. Discharge Current (8/20s) (Imax.): 40KA
IP Protection Level: IP20
Combiner type:1+0, 2+0, 3+0, 4+0, 1+1, 2+1, 3+1
alarmmodule,FScommunication module: OPTIONAL
indicate deterioration: green(normal),red(malfunction)
Material of Outer Shell: Flame retardant material
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3-Main applications
Low Voltage SPD
Very different devices, from both a technological and usage viewpoint, are designated by this term. Low voltage SPDs are modular to be easily installed inside LV switchboards.There are also SPDs adaptable to power sockets, but these devices have a low discharge capacity.
4-Principle
SPD is designed to limit transient overvoltages of atmospheric origin and divert current waves to earth, so as to limit the amplitude of this overvoltage to a value that is not hazardous for the electrical installation and electric switchgear and controlgear.
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5-SPD Eliminates Overvoltages
in common mode, between phase and neutral or earth;
in differential mode, between phase and neutral.
In the event of an overvoltage exceeding the operating threshold, the SPD
conducts the energy to earth, in common mode;
distributes the energy to the other live conductors, in differential mod
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6-Common Characteristics
Uc: Maximum continuous operating voltage
This is the A.C. or D.C. voltage above which the SPD becomes active. This value is chosen according to the rated voltage and the system earthing arrangement.
Up: Voltage protection level (at In)
This is the maximum voltage across the terminals of the SPD when it is active. This voltage is reached when the current flowing in the SPD is equal to In. The voltage protection level chosen must be below the overvoltage withstand capability of the loads. In the event of strokes, the voltage across the terminals of the SPD generally remains less than Up.
In: Nominal discharge current
This is the peak value of a current of 8/20 µs waveform that the SPD is capable of discharging minimum 19 times
Why is In important?
In corresponds to a nominal discharge current that a SPD can withstand at least 19 times: a higher value of In means a longer life for the SPD, so it is strongly recommended to chose higher values than the minimum imposed value of 5 kA.
Imax: Maximum discharge curren
This is the peak value of a current of 8/20 µs waveform that the SPD is capable of discharging once.
Why is Imaximportant?
If you compare 2 SPDs with the same In, but with different Imax: the SPD with higher Imax value has a higher "safety margin" and can withstand higher surge current without being damaged
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High-concerned chemical : None
Type : SPD
Model Number : MY7
COLOR : White
Type : Surge protection device
Voltage : ~275V
Max.Continuous Operating Voltage (Uc) : 40kA
Nominal Discharge Current (8/20s) (In) : 20kA
Combiner type : 1+0
Protection Level : IP20
Chip : High energy MOV