LSK-NC2720S, LSK-NC3220S, LSK-NC4420S

Power line Type2 SPD LSK-NC for TN-C system

LSK-NC2720S, LSK-NC3220S, LSK-NC4420S

  • Modular SPD for use in TN-C systems; with floating remote signalling contact.
  • JISクラスⅠ・Ⅱ
  • JISクラスⅠ・Ⅱ
  • JISクラスⅠ・Ⅱ


・Prewired complete unit consisting of a base part and plug-in protection modules.
・High discharge capacity due to heavy duty zinc oxide varistors.
・Easy to replace the protection modules without tools.
・EU RoHS Compliant with regulated substances




Type LSK-NC2720S LSK-NC3220S LSK-NC4420S
SPD according to EN 61643-11
/IEC 61643-11
Nominal a.c. voltage (Un) 230 / 400 V
(50 / 60 Hz)
230 / 400 V
(50 / 60 Hz)
400 / 690 V
(50 / 60 Hz)
Max. continuous operating
a.c. voltage (Uc)
(50 / 60 Hz)
(50 / 60 Hz)
(50 / 60 Hz)
Nominal discharge current (8/20μs) (In) 20kA 20kA 20kA
Max.discharge current (8/20μs) (Imax) 40kA 40kA 40kA
Voltage protection level (Up) ≦1.4kV ≦1.5kV ≦2.5kV
Response time (tA) ≦25ns
Max. mains-side overcurrent protection 125 A gL/gG
Short-circuit withstand capability for max.
mains-side overcurrent protection(Isccr)
25 kA rms
Temporary overvoltage (TOV) (Ut)
-Characteristic -withstand mode
335V / 5sec. 335V / 5sec. 580V / 5sec.
Temporary overvoltage (TOV) (Ut)
-Characteristic -safe failure mode
440V 120min. 440V 120min. 765V 120min.
Operating temperature range (Tu) -40℃~ +70℃
Operating state / fault indication Green : Normal / Red : Failure
Number of ports 1
Cross-sectional area (min.) 1.5mm2 solid / flexible
Cross-sectional area (max.) 35mm2 stranded / 25mm2 flexible
For mounting on 35mm DIN rails acc. to EN 60715
Enclosure material thermoplastic, UL 94 V-0
Place of installation Indoor installations
Degree of protection IP 20
Capacity 3 module(s)
Approvals TUV, CE -
Comformity to environment Comply to RoHS requirement
Type of remote signalling contact changeover contact
a.c. switching capacity 250V / 0.5A
d.c. switching capacity 250V / 0.1A ;
125V / 0.2A ;
75V / 0.5A
Cross-sectional area for remote signalling terminals max. 1.5mm2
solid / flexible

Dimension drawing

LSK-NC2720S, LSK-NC3220S, LSK-NC4420S