Kumwell KZ12.*.ds-3/0 is surge arrester class II according to IEC 61643-11. Complete device consists of a base part and pluggable module. These arresters are recommended for use in the Lightning Protection Zones Con-cept at the boundaries of LPZ 1-2 (according to IEC 62305) for equipotential bonding and elimination of transient overvoltage that originate during atmos-pheric discharges or switching processes.

The main use of KZ12.*.ds-3/0 arrester is in all kinds of industry, residential and administration buildings. They are to be placed into the secondary switchboards or into the control box.

Three-Phase for TN-C System
Technical Data		KZ12.U0275.ds-3/0	KZ12.U0320.ds-3/0	KZ12.U0385.ds-3/0	KZ12.U0440.ds-3/0
Max. continuous operating voltage	UN	275 V AC	320 V AC	385 V AC	440 V AC
Max. discharge current (8/20µs)	Imax	50 kA	50 kA	40 kA	40 kA
Nominal discharge current (8/20µs)	In	20 kA	20 kA	15 kA	15 kA
Voltage protection level at In	UP	< 1.3 kV	< 1.45 kV	< 1.65 kV	< 2.15 kV
Temporary overvoltage (TOV)	UT	355 V / 5sec	410 V / 5sec	465 V / 5sec	530 V / 5sec
Response time	tA		< 25 ns
Max. back-up fuse			160 A gL/gG
Short-circuit withstand capability	Ip		60 kArms
LPZ			1-2
Protection type			IP20
Operating temperature range			-40°C to + 80°C
Mounting on			Din rail 35 mm
Failure indication			green (ok) / red (failure)