Kumwell KZ12.*.ds surge arrester Class II according to IEC 61643-11. These arresters are recommended for use in the Lightning Protection Zones Cencept at the boundaries of LPZ 1-2 (according to IEC 62305) for equip-otential bonding and ellmlnation of transient overvoltage that orlginate during atmospheric discharges or svvltching processes.

The main use of KZ12.*.ds 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.

VARISTOR
Technical Data		KZ12.U0275.ds	KZ12.U0320.ds	KZ12.U0385.ds	KZ12.U0440.ds
Max. continuous operating voltage	UC	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	< 2 kV
Temporary overvoltage (TOV)	UT	335 V/5 sec	410 V/5 sec	465 V/5 sec	530 V/5 sec
Response time	tA		< 25 ns
Max. back-up fuse			60 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)