G - AA Electric

Overvoltage protection for energy distribution systems
Sold by AA Electric 1-800-237-8274 Lakeland, FL • Lawrenceville, GA • Greensboro, NC • East Rutherford, NJ www.A-Aelectric.com
Protection in the TN-S-system
Protection in the TT system
In contrast to normal air gap protectors, Weidmüller’s air gap
protectors PU 1 TSG+ and PU 1 TSG work with electronic
triggering. This triggers the air gap protector so early that the
following arrestor is relieved (PucX). Decoupling to downstream
arrestors in class II (C) is not necessary because triggered
air gap protectors work with low operating voltage.
One difference between PU 1 TSG+ and PU1 TSG is the follow
current interruption. PU 1 TSG+ distributes the arc voltage
to several chambers; as soon as the sum of the arc voltages
of the different chambers is higher than the current mains voltage,
the follow current is interrupted. In PU1 TSG, the follow
current is interrupted in the next zero crossing of the mains
voltage.
Overvoltage protection
I
I.5