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Scope of Application

TXSPD Surge Protection Device (ALU3, surge protective device),-B, C, D series large current modular TXSPD Surge Protection Device is used for power supply systems of AC 50/60Hz, the TT, IT, TN-S, TN-C, TN-C-S of rated voltage 380V and below, ro protect the power grid caused by lightning or surge overvoltage. The design is based on the C61643-1,GB18802-2002, it can discharge the 100kA lightning current, case is installed on 35mm electric rail, the detachment device automatically will be out of its power grid, meanwhile the status indicator turns from green to red. TXSPD Surge Protection Device has protection modes of common mode (MC) and differential mode (MD).


TXSPD Surge Protection Device complies with the requirements of GB18802.1 and IEC61643-1 standard.

Models and Specifications

The function of surge protectors

TXSPD Surge Protection Device use a varistor of excellent nonlinear, in normal conditions, surge protective device is in high resistance state, the leakage current is almost zero, to ensure the normal power supply for power supply system. When the overvoltage of the power system appears, the surge protective device immediately conduct in nanoseconds, the amplitude of overvoltage limit in the safety work scope of the equipment. At the same time, the over-voltage energy is released. Then, the surge protective device quickly turned into a high impedance state, which does not affect the normal power supply for power system.

Structure and working principle

TXSPD Surge Protection Device in three-phase four-wire system, the surge protective devices are connected between the three phase lines and a zero line ground wire. Surge protective device is in high resistance state under normal circumstances, when surge voltage of the power grid caused by lightning or other causes appears , the surge protective device will immediately conduct in the nanosecond time to take surge into the earth, and to protect electrical equipment on the power grid. When the surge voltage passes through the protector, after disappears, the surge protective device changes to high resistance state, thereby not affecting the normal operation of the power network.

Product Features

★ use of independent intellectual property rights of high-performance zinc oxide varistor film
★ use of professional technology within the metal shield protection module
★ built-in over-current overheating, temperature control circuit technology
★ Alarm indication is obvious, green (normal), red (fault)
★ module design, easy installation, maintenance, easy maintenance
★ with a remote communication interface, enabling remote monitoring

Main technical parameters

Model TXU3-B30 TXU3-B40 TXU3-B60

Max 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 In (8/20μs) (kA)

30 40 60

Max discharge current

Imax (8/20μs) (kA)

60 80 100
Response time t(ns) <25
Fuses or circuit breakers (A) 63
Working environment (℃) -40℃~+85℃
Relative humidity(%) ≤95%(25℃)

Access conductor

cross-sectional area (mm²)

≥25 ≥35 ≥35

Access ground

cross-sectional area (mm²)

≥35 ≥35 ≥35
Model TXU3-C15 TXU3-C20

Max 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 In (8/20μs) (kA)

15 20

Max discharge current

Imax (8/20μs) (kA)

30 40
Response time t(ns) <25
Fuses or circuit breakers (A) 25 32
Working environment (℃) -40℃~+85℃
Relative humidity(%) ≤95%(25℃)

Access conductor

cross-sectional area (mm²)

≥16 ≥25

Access ground

cross-sectional area (mm²)

≥16 ≥25

Alarm wire

cross-sectional area (mm²)

≥1.5
Model TXU3-D5 TXU3-D10

Max 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 In (8/20μs) (kA)

5 10

Max discharge current

Imax (8/20μs) (kA)

10 20
Response time t(ns) <25
Fuses or circuit breakers (A) 10 16
Working environment (℃) -40℃~+85℃
Relative humidity(%) ≤95%(25℃)

Access conductor

cross-sectional area (mm²)

≥10 ≥16

Access ground

cross-sectional area (mm²)

≥16 ≥25
Alarm wire cross-sectional area (mm²) ≥1.5

Installation location and application

■ C-class lightning current SPD protector for lightning equipotential bonding.
■ Install LPZ0B or LPZ1 area and LPZ2 area.
Surge protection device is usually installed in the floor distribution box, computer center, telecommunication room, elevator control room, cable TV room, building control room, security monitoring center, fire control center, industrial control room, frequency conversion equipment control room, hospital operating room, ICU and Equipped with electronic

Outline and installation dimensions

Why use surge protector

The destructive force of lightning is great, lightning outside the switching power supply (lightning rod) is not enough, the lightning wave will directly or indirectly (through electromagnetic induction) invaded all electrical pathways and metal channels (such as power line and signal line, antenna and metal pipe etc.). Overvoltage and lightning surge voltage resulting will cause great harm to the network system, electrical equipment, electronic information, light damaged lines, heavy damage to the device, make the system paralysis, caused incalculable loss.The lightning current rapidly changing, in the electric

Ordering Information

When ordering, please indicate the following points:
Product model and name: such as TXSPD Surge Protection Device
Specifications: such as C-class.
Max discharge current: 40kA.
Poles: 2P
Order number: such as 730.
Order example: TXSPD Surge Protection Device, 40kA, 1P, 8000.


Keywords: SPD,Surge protection device ,surge protective device

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