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With a thorough understanding of standards and regulations, LSP manufactures millions of surge protection devices (SPDs) every year.
Our teams bring surge protection devices (SPDs) with our unique client-focused service & quality to the closest possible to the market demand.
There are three different types of surge protection device SPD according to IEC 61643-11:2011 and EN 61643-11:2012+A11:2018.
Type 1, type 2, and type 3 surge protection device SPD protect against malfunctions and defects caused by overvoltages.
DIN-Rail AC Type 1 surge protection device SPD FLP25 series is developed as the best solution available to protect service entrance at an industrial site, especially those with existing lightning protection systems or meshed cage applications.
Type 1 AC SPD FLP25-275/4+0
for 3 phase TN-S networks
Type 1 AC SPD FLP25-275/3+1
for 3 phase TT and TN-S
Type 1 AC SPD FLP25-275/3+0
for 3 phase TN-C networks
FLP25 series DIN-Rail Type 1 AC SPD surge protection device is particularly useful in a high lightning density area where the risk of heavy surge current or even direct strike is high (eg: buildings equipped with lightning rods).
Nominal voltage Un: 120V 230V 400V
Max. continuous operating voltage Uc: 150V 275V 320V 385V 440V
Type 1 / Class I / Class B
Impulse discharge current (10/350 μs) Iimp = 25kA @ Type 1
Nominal discharge current (8/20 μs) In = 25kA @ Type 2
Maximum discharge current (8/20 μs) Imax = 100kA @ Type 2
Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)
Type 1 AC SPD surge protection device is characterized by a 10/350 µs lightning current waveform.
DIN-Rail Type 1 AC SPD installed at the load center’s main circuit breaker, e.g. main distribution board.
Reliable Type 1 AC surge protection device is designed to meet the protection needs of installations against lightning and surges. Get Type 1 AC SPD price now!
This type of DIN-Rail Type 1+2 AC surge protection device SPD can protect all electrical installations against lightning strikes by discharging the current created from a lightning surge and keeping it from spreading to the equipment.
Type 1+2 AC SPD FLP12,5-275/4+0
for 3 phase TN-S networks
Type 1+2 AC SPD FLP12,5-275/3+1
for 3 phase TT and TN-S
Type 1+2 AC SPD FLP12,5-275/3+0
for 3 phase TN-C networks
AC Type 1+2 surge protection device SPD is characterized by a 10/350 µs and 8/20 µs lightning current waveform.
Nominal voltage Un: 120V 230V 400V
Max. continuous operating voltage Uc: 150V 275V 320V 385V 440V
Type 1+2 / Class I+II / Class B+C
Impulse discharge current (10/350 μs) Iimp = 12,5kA @ Type 1
Nominal discharge current (8/20 μs) In = 20kA @ Type 2
Maximum discharge current (8/20 μs) Imax = 50kA @ Type 2
Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)
AC Type 1+2 surge protection device SPD installed at the origin of the AC installation equipped with LPS.
Reliable AC Type 1+2 surge protection device SPD is designed to meet the protection needs of installations against lightning and surges. Get Type 1+2 SPD price now!
The Housing of Type 1+2 DIN-Rail AC surge protection device SPD is a pluggable design.
Type 1+2 AC SPD FLP7-275/4+0
for 3 phase TN-S networks
Type 1+2 AC SPD FLP7-275/3+1
for 3 phase TT and TN-S
Type 1+2 AC SPD FLP7-275/3+0
for 3 phase TN-C networks
This DIN-Rail AC Type 1+2 surge protection device SPD FLP7 series use Metal Oxide Varistor (MOV) and/or Gas Discharge Tube (GDT) circuits to protect electrical devices from spikes in alternating current power.
Nominal voltage Un: 120V 230V 400V
Max. continuous operating voltage Uc: 150V 275V 320V 385V 440V
Type 1+2 / Class I+II / Class B+C
Impulse discharge current (10/350 μs) Iimp = 7kA @ Type 1
Nominal discharge current (8/20 μs) In = 20kA @ Type 2
Maximum discharge current (8/20 μs) Imax = 50kA @ Type 2
Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)
These AC Type 1+2 surge protection device SPD series are designed to be connected in multi-pole configuration to protect single-phase, 3-phase and 3-phase+Neutral AC networks, and for TN-C, TN-S, TN-C-S TT, and IT power supply systems.
Reliable AC Type 1+2 surge protection device SPD is designed to meet the protection needs of installations against lightning and surges. Get Type 1+2 SPD price now!
AC Type 2 surge protection device SPD SLP40 series is characterized by an 8/20 µs lightning current waveform.
These AC Type 2 surge protection device SPD SLP40 series are designed to be installed at the service entrance of low voltage systems or close to sensitive equipment to protect against transient overvoltages.
AC Type 2 surge protection device SPD
SLP40-275/4+0 for 3 phase TN-S networks
AC Type 2 surge protective device SPD
SLP40-275/3+1 for 3 phase TT and TN-S
AC Type 2 surge protector device SPD
SLP40-275/3+0 for 3 phase TN-C networks
AC Type 2 surge protection device SPD
SLP40-275/2+0 for single phase TN-S
AC Type 2 surge protective device SPD
SLP40-275/1+1 for single phase TT and TN-S
AC Type 2 surge protector device SPD
SLP40-275/1+0 for single phase TN-S, TN-C, TT (only L-N)
DIN-Rail AC Type 2 surge protection device SPD SLP40 series is for nominal working voltage (50/60Hz) Un = 120V 230V 400V ac applications,
and for maximum continuous operating voltage (50/60Hz) Uc = 150V 275V 320V 385V 440V ac applications.
Nominal voltage Un: 120V 230V 400V
Max. continuous operating voltage Uc: 150V 275V 320V 385V 440V
Type 2 / Class II / Class C
Nominal discharge current (8/20 μs) In = 20kA @ Type 2
Maximum discharge current (8/20 μs) Imax = 40kA @ Type 2
Protective elements: Metal Oxide Varistor (MOV), Gas Discharge Tube (GDT)
AC Type 2 surge protection device SPD SLP40 series is generally installed in sub-distribution or machine control cabinets.
These DIN-Rail AC Type 2 surge protection device SPD SLP40 series are rated for indoor use or fixed into a waterproof box for outdoor use.
Reliable AC Type 2 surge protection device SPD is designed to meet the protection needs of installations against lightning and surges. Get Type 2 SPD price now!
AC Type 3 surge protection device SPD is characterized by a combination of voltage waves (1.2/50 μs) and current waves (8/20 μs).
AC Type 3 surge protection device SPD
TLP-xxx/2(S) for 24V 48V 60V 120V 230V
AC Type 3 surge protection device SPD
TLP-xxx/2(S) for 24V 48V 60V 120V 230V
AC Type 3 surge protection device SPD
TLP-xxx/2(S) for 24V 48V 60V 120V 230V
AC Type 3 surge protection device SPD is generally installed near the protected load, to protect sensitive equipment for 24V 48V 60V 120V 230V, in coordination with Type 2 surge arrester installation head.
Nominal voltage Un: 24V 48V 60V 120V 230V
Max. continuous operating voltage Uc: 30V 60V 75V 150V 255V
Type 3 / Class III / Class D
Open-circuit voltage (1.2/50 μs) Uoc = 2 kV @ Type 3
Nominal discharge current (8/20 μs) In = 1 kA @ Type 2
Load current IL = 25 A
Arresters tested and found AC Type 3 surge protection device SPD are intended to be installed near sensitive equipment, in coordination with Type 2 surge arrester installation head.
Reliable AC Type 3 surge protection device SPD is designed to meet the protection needs of installations against lightning and surges. Get Type 3 SPD price now!
A surge protection device (SPD) is designed to protect electrical systems and equipment from surge events by limiting transient voltages and diverting surge currents.
When a transient voltage occurs on the protected circuit, an SPD limits the transient voltage and diverts the current back to its source or ground.
To work, there must be at least one non-linear component of the SPD, which under different conditions transitions between a high and low impedance state.
At normal operating voltages, the SPDs are in a high-impedance state and do not affect the system. When a transient voltage occurs on the circuit, the SPD moves into a state of conduction (or low impedance) and diverts the surge current back to its source or ground.
This limits or clamps the voltage to a safer level. After the transient is diverted, the SPD automatically resets back to its high-impedance state.
Surge protection devices contain at least one non-linear component (a varistor or spark gap), its electrical resistance varying in the function of the voltage which is applied to it.
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.
The operating principle of a surge protection device is as follows:
Type 1 surge protection device SPD is used in unmetered areas. They must satisfy the most stringent requirements, as they are supposed to protect against the effects of direct lightning strikes. The demand placed on the short-circuit current rating is very high in a typical main distribution installation environment. In order to be able to meet these requirements, powerful technology, such as spark gap technology, is required.
Type 1+2 surge protection device SPD are lightning current arresters that, in addition to the lightning current test, also fulfill the required tests of type 2 surge protection device SPD. The Type 1+2 surge protection device SPD offers a special feature. It combines powerful spark gaps directly with varistor-based surge protection devices.
Type 2 surge protection device SPD with a low discharge capacity are installed in the metered area. They are generally installed in sub distributions or machine control cabinets.
These surge protection devices must be able to discharge induced overvoltages from indirect lightning strikes or switching operations, but do not have to handle direct lightning strikes. Discharge technology with fast response behavior – such as varistor technology – has proven itself here.
Type 3 surge protection device SPD with the lowest discharge capacity, also known as device protection, is installed as close as possible to the end device. Special surge protection devices are needed for signal lines. These are also installed immediately upstream of the end devices to be protected.
Type 3 surge protection device SPD are available in a wide range of designs to suit the various different installation environments. In addition to standard DIN rail mounting, there are products for installation in sockets or for direct mounting on a PCB of the end device.
Technologically speaking, type 3 surge protection device SPD is similar to type 2 surge protection device SPD, which is based on varistors, but the requirements concerning discharge capacity are even lower compared to type 2 surge protection device SPD.
Type 2 and Type 3 surge protection device SPD is provided above all on cables that lead into a building from the outside.
Where multiple devices are required to protect the installation, they must be coordinated to ensure correct operation. Items supplied by different manufacturers should be confirmed for compatibility, the installer and manufacturers of the devices are best placed to provide guidance on this.
A surge protection device (SPD) or simply a surge protector is a device used to protect electronic devices from power surges or transient voltage.
The surge protection device (SPD) is a component of the electrical installation protection system.
This surge protection device (SPD) is connected in parallel to the power supply circuit of the loads that it has to protect (see Figure). It can also be used at all levels of the power supply network.
Surge protection device (SPD) connected in parallel has a high impedance. Once the transient overvoltage appears in the system, the impedance of the device decreases so surge current is driven through the surge protection device (SPD), bypassing the sensitive equipment.
Direct lightning stroke | Indirect lightning stroke | Indirect lightning stroke | |
IEC 61643-1:2005 | Class I test | Class II test | Class III test |
IEC 61643-11:2011 | Type 1 / T1 | Type 2 / T2 | Type 3 / T3 |
EN 61643-11:2012 + A11:2018 | Type 1 / T1 | Type 2 / T2 | Type 3 / T3 |
VDE 0675-6-11 | Class B | Class C | Class D |
Type of test wave | 10/350 μs | 8/20 μs | 1.2/50 μs + 8/20 μs |
Terminology | Iimp – Impulse discharge current (kA) | In – Norminal discharge current (kA) Imax – Maximum discharge current (kA) | Uoc – Open-circuit voltage (kV) |
Note 1: There exists Type 1+2 Surge Protection Device (SPD) combining the protection of loads against direct and indirect lightning strokes.
Note 2: Some Type 2 Surge Protection Devices can also be declared as Type 3 SPD.
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 lightning 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 an 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 choose higher values than the minimum imposed value of 5 kA.
Iimp: Impulse current
This is the peak value of a current of 10/350 µs waveform that the SPD is capable of discharging of discharging at least one time.
Why is Iimp important?
IEC 62305 standard requires a maximum impulse current value of 25 kA per pole for three-phase system. This means that for a 3P+N network the SPD should be able to withstand a total maximum impulse current of 100kA coming from the earth bonding.
Ifi: Autoextinguish follow current
Applicable only to the spark gap technology. This is the current (50 Hz) that the SPD is capable of interrupting by itself after flashover. This current must always be greater than the prospective short-circuit current at the point of installation.
Imax: Maximum discharge current
This is the peak value of a current of 8/20 µs waveform that the SPD is capable of discharging once.
Why is Imax important?
If you compare 2 SPDs with the same In, but with different Imax: the SPD with a higher Imax value has a higher “safety margin” and can withstand higher surge current without being damaged.
Uoc: Open-circuit voltage applied during class III (Type 3) tests.
LSP’s reliable AC surge protection device SPD are designed to meet the protection needs of installations against lightning and surges. Contact our Experts!
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