1、 Scope of application

TXU3（ALU3 Surge Protector）-B. C and D series large flow modularizationALU3Surge protectors are suitable for TT, IT, TN-S, TN-C, TN-C-S and other power supply systems with AC 50/60Hz and rated voltage of 380V or below, to protect the power grid from lightning strikes or surge overvoltage. Its design basis complies with C61643-1 and GB18802-2002. It can discharge 100KA lightning current, and the shell is designed to be installed on a 35mm electrical guide rail. The disconnection device can automatically disconnect it from the power grid, and the status indicator window changes from green to red.
ALU3 surgeThe protector has common mode (MC) and differential mode (MD) protection modes. The ALU3 surge protector meets the requirements of standards such as GB18802.1 and IEC61643-1.

2、 Model and specifications

3、 The function of surge protectors

ALU3Surge protective deviceA varistor with excellent nonlinear characteristics is used, and under normal circumstances, the surge protector is in an extremely high resistance state, with almost zero leakage current, ensuring the normal power supply of the power system. When the power system experiences overvoltage as described above, the surge protector immediately conducts rapidly within nanoseconds, limiting the amplitude of the overvoltage to the safe operating range of the equipment. Simultaneously release the energy of the overvoltage. Subsequently, the surge protector quickly changed to a high resistance state, thus not affecting the normal power supply of the power system.

4、 Structure and working principle

ALU3Surge protective deviceIn a three-phase four wire system, three phase wires and one neutral wire are all connected to the grounding wire with a protector. Under normal circumstances, the protector is in a high resistance state. When the power grid experiences surge overvoltage due to lightning strikes or other reasons, the protector will immediately conduct rapidly in nanoseconds, introducing the surge overvoltage into the ground and protecting the electrical equipment on the power grid. When the surge voltage passes through the protector and disappears, the protector returns to a high resistance state, so as not to affect the normal operation of the power grid.

5、 Product Features

★ Adopting high-performance zinc oxide varistors with independent intellectual property rights
★ Adopting professional technology for internal metal shielding protection module
★ Built in overcurrent and overheating, temperature controlled circuit breaker technology
★ Clear alarm indication, green (normal), red (fault)
★ Module design, easy installation, simple maintenance operation with power on
★ Equipped with remote signaling interface, capable of remote monitoring
★ New technology for producing high-energy gap discharge electrodes

6、 Main technical parameters

model	TXU3-B30		TXU3-B40		TXU3-B60
Maximum continuous operating voltage Uc (V~)	320	385	320	385	320	385
Protection level Up (kV)	＜2.0	＜2.0	＜2.0	＜2.5	＜2.5	＜3.0
Nominal discharge current ln (8/20 μ s) (kA)	30		40		60
Maximum discharge current Imax (8/20 μ s) (kA)	60		80		100
Response time t (ns)	＜25
Fuse or circuit breaker (A)	63
Working environment (℃)	-40℃~+85℃
Relative humidity (%)	≤95%（25℃）
Connecting wire cross-sectional area (mm ²)	≥25		≥35		≥35
Grounding wire cross-sectional area (mm ²)	≥35		≥35		≥35

model	TXU3-C15					TXU3-C20
Maximum continuous operating voltage Uc (V~)	275	320	375	420	440	275	320	375	420	440
Protection level Up (kV)	＜1.2	＜1.5	＜1.8	＜2.0	＜2.0	＜1.2	＜1.5	＜1.8	＜2.0	＜2.0
Nominal discharge current ln (8/20 μ s) (kA)	15					20
Maximum discharge current Imax (8/20 μ s) (kA)	30					40
Response time t (ns)	＜25
Fuse or circuit breaker (A)	25					32
Working environment (℃)	-40℃~+85℃
Relative humidity (%)	≤95%（25℃）
Connecting wire cross-sectional area (mm ²)	≥16					≥25
Grounding wire cross-sectional area (mm ²)	≥16					≥25
Alarm line cross-sectional area (mm ²)	≥1.5

model	TXU3-D5				TXU3-D10
Maximum continuous operating voltage Uc (V~)	275	320	385	420	275	320	385	420
Protection level Up (kV)	＜1.2	＜1.5	＜1.8	＜2.0	＜1.2	＜1.5	＜1.8	＜2.0
Nominal discharge current ln (8/20 μ s) (kA)	5				10
Maximum discharge current Imax (8/20 μ s) (kA)	10				20
Response time t (ns)	＜25
Fuse or circuit breaker (A)	10				16
Working environment (℃)	-40℃~+85℃
Relative humidity (%)	≤95%（25℃）
Connecting wire cross-sectional area (mm ²)	≥10				≥16
Grounding wire cross-sectional area (mm ²)	≥16				≥25
Alarm line cross-sectional area (mm ²)	≥1.5

7、 Installation location and application

C-level lightning current SPD protector, used for equipotential connection during lightning strikes.
Install at the junction of LPZ0B or LPZ1 zone and LPZ2 zone.
Usually installed in floor distribution boxes, computer centers, telecommunications rooms, elevator control rooms, cable TV rooms, building control rooms, security monitoring centers, fire centers, industrial control rooms, frequency conversion equipment control rooms, hospital operating rooms, monitoring rooms, and distribution boxes containing electronic medical equipment; It can also be installed in the residential lighting distribution box below the floor level; Distributed small villas should install SPD in the household distribution box.

8、 Appearance and installation dimensions

9、 Why use surge protectors

The destructive power of lightning is extremely strong, and external lightning protection (such as lightning rods) is not enough for switch mode power supplies. Lightning waves can directly or indirectly (through electromagnetic induction) invade various electrical and metal channels (such as power lines, signal lines, feeder lines, and metal pipelines). The lightning overvoltage and surge voltage generated from this will cause great harm to electronic, electrical equipment, and information network systems, ranging from damaging power lines to damaging equipment, causing system paralysis and incalculable losses.
The rapidly changing lightning current can induce high voltage on electrical circuits and double stranded wires, causing insulation damage to the system. Various operations of the power system can generate operational overvoltage on power lines; Some electrical equipment switch operations, short circuit tripping, etc. can generate overvoltage (surge voltage) in the power supply line that is higher than the normal operating voltage, thereby causing harm to electrical equipment.

10、 Ordering Notice

When placing an order, please indicate the following points:
Product model and name: such asALU3-CSurge protective device
Specification: such as Class C.
Maximum discharge current: 40kA.
Polar number: 2P
Order quantity: such as 730 pieces.
Example of ordering:ALU3-CSurge protective device， 40kA，1P， 8000 pieces.