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Surge Arrester – Type 2


Pluggable single-pole surge arrester consisting of a base part and plug-in protection module; with floating changeover contact.

  • Multi-purpose surge arrester consisting of a base element and plug-in protection odule
  • High discharge capacity due to heavyduty zinc oxide varistor
  • High reliability due to “Thermo Dynamic Control” SPD monitoring device
Basic circuit diagram

Technical data

SPD according to EN 61643-11 / IEC 61643-11type 2 / class II
Nominal a.c. voltage Un275 V AC (48/62 Hz)
Max. continuous operating a.c. voltage Uc320 V AC (48/62 Hz)
Nominal discharge current (8/20μs) In10 kA
Maximum discharge current (8/20μs) Imax20 kA
Voltage Protection level UP1,25 kV
Response time tA25 ns
Max. mains-side over-current protection125 A gL/gG
Short-circuit current rating ISCCR25 kArms
Temporary overvoltage (TOV) (UT) – Characteristic335 V / 5 sec. – withstand
Temporary overvoltage (TOV) (UT) – Characteristic440 V / 120 min. – safe failure
Range of operating temperatures (TU)-40/+80°C
Operating state / fault indicationgreen / red
Number of ports1
Cross-sectional area (min.)1.5 mm2 solid /flexible
Cross-sectional area (max.)35 mm2 stranded / 25 mm2 flexible
For mounting on35 mm DIN rail acc. to EN 60715
Enclosure materialthermoplastic
Place of installationindoor installation
Degree of protectionIP 20
Capacity1 module(s), DIN 43880
Type of remote signalling contact
a.c. switching capacity
d.c. switching capacity
Cross-sectional area for remote signalling terminals


Other products in this category 


SLP20-275/1S+1 (OBO)

Un = 275 Vac

Imax (8/20μs) = 20 kA

1+NPE, single-phase, for TT and TN systems


SLP20-275/2S (OBO)

Un = 275 Vac

Imax (8/20μs) = 20 kA

2P, single-phase, for TN systems


SLP20-275/2S+1 (OBO)

Un = 275 Vac

Iimp (10/350μs) = 20 kA

2+NPE, three-phase, for TT and TN-S systems


SLP20-275/3S (OBO)

Un = 275 Vac

Imax (8/20μs) = 20 kA

3P, three-phase, for TN-C systems


SLP20-275/3S+1 (OBO)

Un = 275 Vac

Imax (8/20μs) = 20 kA

3+NPE, three-phase, for TT and TN-S systems


SLP20-275/4S (OBO)

Un = 275 Vac

Imax (8/20μs) = 20 kA

4P, three-phase, for TN-S systems