Overvoltage arresters

Provide safety in case of overvoltage, i.e. short-timed high-tension peaks. It cut down the overvoltage to safety level. Overvoltage is caused by an atmospheric discharge e.g. a lightning shot into the outside air conduction, or into the lightning road system, starting of an equipment with high induction, turn off of the circuit breakers or high rated fuses, using of semiconducted switches, thyristor switch or starting of the electromotors. Overvoltage arresters are in class B, C, D, (Type 1, 2, 3) connected to cascades. At the biggining of whole system is an overvoltage arrester damping the higher overvoltage and brings it down to the level suitable for the next class of overvoltage arrester, untill the outgoing voltage from the last arrester is suitable for an appliance.

We offer overvoltage arresters NADER. Marking NDM1G - overvoltage arresters and NDM1Q - undervoltage arresters. They can be used only with the breakers NDM1 Nader.

This is the specification of this overvoltage arresters: overvoltage arresters

We offer also overvolgage arrestiers of this types:

SJB Lightning current arresters - stage 1 - type 1

Maximum constant operating voltage AC  260 ÷ 440 V a.c.

Lightning current (10/350) - peak value  35 ÷ 100 kA

Rated discharge current (8/20)  35 ÷ 100 kA

Rated frequency min.  50 Hz

Rated frequency max.  60 Hz 

Voltage protection level  <1,5 kV / < 4 kV 

Maximum backup fuse  125 A / 250 A

Arrester classification according to EN 61643-11  T1 

Degree of protection  IP20

Conductor rigid max.  35 mm2 / 50 mm2

Ambient temperature min.  -40 °C

Ambient temperature max.  85 °C

EN 61643-11  

IEC 61643-1  

VDE 0675-6 

Iimp [kA]	Version	Type	Number of modules
(10/350) μs
35	Encapsulated arrester gap	SJBpro35	1
	Encapsulated arrester gap with electronic ignition realise	SJBpro35/1,5	1
50	Arrester gap	SJBplus50	2
	Arrester gap with electronic ignition realise	SJBplus50/1,5	2
100	Summary  arrester gap with electronic ignition realise	SJB100/NPE/1,5	2

SJBpro35 is used in home applications, SJBplus50 is assigned for industrial applications.
Voltage protection level for SJBpro35/1,5 is Up = 1,5 kV and for SJBpro35/1,5 is Up = 1,5 kV.
By using SJBpro35and SJBplus50 is needed to observe the length of the line between type1 and type2 min. 10 m.

 

SVL, SJL Surge voltage arresters - stage 2 - type 2

Maximum constant operating voltage AC  275 V a.c.
Maximum constant operating voltage DC  350 V d.c.
Rated discharge current (8/20)  10 ÷ 16 kA
Maximum discharge current (8/20)  20 ÷ 40 kA
Rated frequency  50 Hz
Voltage protection level  < 1,35 kV
Maximum backup fuse  100 A
Arrester classification according to EN 61643-11  T2
Degree of protection  IP20
Conductor rigid max.  16 mm2
Ambient temperature min.  -25 °C
Ambient temperature max.  45 °C
EN 61643-11  
IEC 61643-1  
VDE 0675-6  

Version	Type	Number of modules
Varistor	SVL275	1
Varistor+signalling	SVL275S	1
Varistor+arrester gap	SJL275	1
Varistor+ arrester gap + signalling	SJL275S	1

SVM Surge voltage arresters with removable module - stage 2 - type 2

Maximum constant operating voltage AC  260 ÷ 440 V a.c.
Maximum constant operating voltage DC  350 ÷ 585 V a.c.
Rated discharge current (8/20)  20 kA
Maximum discharge current (8/20)  40 kA
Rated frequency  50 Hz
Voltage protection level  < 2.2 kV
Maximum backup fuse  125 A
Arrester classification according to EN 61643-11  T2
Degree of protection  IP20
Conductor rigid max.  35 mm2
Ambient temperature min.  -40 °C
Ambient temperature max.  80 °C
EN 61643-11  
IEC 61643-1  
VDE 0675-6  

Desing	Uc[V]	Description	Type	Number of modules
Varistor	275	Base+replaceable module	SVM275-Z	1
		Base with signalling contact, replaceable module	SVM275-ZS	1
		Replaceable module	SVM275	1
	440	Base+replaceable module	SVM440-Z	1
		Base with signalling contact, replaceable module	SVM440-ZS	1
		Replaceable module	SVM440	1
Discharge arrester	260	Base+replaceable module	SVM260/NPE-Z	1
		Replaceable module	SVM260/NPE	1

 

In the case of a failure it is sufficietn to change the module without the need of turning the device off.

SVD Surge voltage arresters - stage 3 - type 3

Maximum constant operating voltage AC  253 V a.c.
Rated loading current / 40 °C  20 A
Rated discharge current (8/20)  < 1,5 kA / < 3 kA
Maximum discharge current (8/20)  < 5 kA / < 10 kA
Off-load voltage  6 kV
Rated frequency  50 Hz
Voltage protection level between L-PE, N-PE  < 1,5 kV
Maximum backup circuit breaker  16 A / 20 A
Maximum backup fuse  16 A / 20 A
Arrester classification according to EN 61643-11  T3
Degree of protection  IP20
Conductor rigid max.  4 mm2
Ambient temperature min.  -40 °C
Ambient temperature max.  85 °C
EN 61643-11  
IEC 61643-1  
VDE 0675-6  

Design	Description	Type	Number of modules
On DIN rail	SET (base + replaceble module)	SVD250M-ZS	1
	Replaceble module	SVD250M	1
On wiring boxes	SET (base + replaceble module)	SVD250-ZS
	Replaceble module	SVD250

MOKI. s.r.o., distribúcia elektrosúčiastok
Kalinčiakova 27
831 04 Bratislava

tel..: 032 - 743 09 68
fax.: 032 - 743 09 73