Siemens surge arrester Type 2 class C 4P 20KA 5SD74640

Siemens Type 2 Class C 4P 20KA Surge Arrester

The surge arrester is designed to protect against transient overvoltages in TN-S and TT systems, with a 4-pole (3+1) configuration for effective protection management. It supports operating voltages up to 230 V AC with a frequency of 50/60 Hz and can discharge impulse currents up to 40 kA per phase.

Flexible and compact for DIN rail installation

Featuring a compact design of 4 U.M, this arrester is designed to be mounted on NS 35 DIN rail. The insulation resistance of 1000 M? ensures system safety and reliability over time.

Robust design for demanding environmental conditions

With an IP20 rating, the arrester can operate in environments with relative humidity between 5 and 95 percent and operating temperatures between -40 and +80 degrees. It is vibration resistant and suitable for installations at altitudes up to 2,000 m.

Detailed technical specifications:

• Type: Type 2, Class C

• Rated voltage: 350 V UC

• Pole configuration: 3+1 circuit, 3+N/PE

• Operating voltage: 230 V AC, 50/60 Hz

• Discharge current: up to 40 kA per phase (8/20 µs)

• Degree of protection: IP20

• Pollution degree 2

• Adjustable trip current trip factor 1.6

• Stripping length 16 mm

• Insulation resistance: 1000 M

• Dimensions: Width 71.5 mm, Height 90 mm, Depth 71.5 mm

• Operating temperature: -40/+80 degrees

• Relative humidity: 5 ... 95%

• Connection: Screw clamp, stripping length 16 mm, tightening torque 4.3 ... 4.7 Nm

• Conductor cross-section: flexible conductors 1.5 to 25 mm², rigid conductors 1.5 to 35 mm²