DETAILED DESCRIPTION

DSF A/P are Type 2 (Class C) surge arresters according to EN 61643-11 (VDE 0675, part 6-11) and UL1449 3rd edition suitable for protecting AC systems from transient overvoltage due to both indirect atmospheric discharges and switching actions. It is available for both single and three phase AC lines, TN-S and TN-C. The control windows (no/red indication) and the contact allow both a local and a remote monitoring of the status of the plug-in cartridges, warning the operator about the need to promptly replace the cartridges themselves. These surge protecting devices are Tipe II hence suitable for installation in main distribution cabinet, or secondary distribution board, in installations without external LPS (Lightning Protection System) or where the distance between the LPS elements and the solar panel frames is >50m. These devices do not require any external backup fuse thus saving space and cost. In according to UL1449 3rd Ed. and UTE C 61-740-51 DSF and can be installed on a DIN-rail in any commercially available distribution box.

• Type 2 (class C) according to EN61643-11 (VDE 0675, part 6-11)
• Approved UL1449 3rd Edition
• Complies with IEC-61643-1, UTE C 61-740-51
• Do not require backup fuse up to 200kArms (UL 1449 3rd Ed.)
• Innovative tecnology to prevent dangerous failures in case of temporary overvoltages
• Suitable for unstable networks where sustainend overvoltages may persist for some minutes or longer
• Plug-in cartridges
• Optical indication of exhausted cartridges (red window)
• Voltage-free contact, for remote function monitoring
• Including thermal and dynamic separating device
• Assembled unit ready for mounting
• Marked connections
• For DIN-rail mounting

No backup-fuse tecnology

Long duration overvoltage path

The arrester is activated in the event of electric power system failure. The voltages are much lower than transient voltages but substantially more destructive. The system is composed of a current limiter and a varistor. In the event of increased voltage level the current limiter circuit limits the current through the varistor. When the normal condition is re-established (rated line voltage), the surge arrester continues to perform its normal function.

Transient (short duration) overvoltage path

The arrester is activated at the occurence of instantaneous high voltage surges lasting only a few microseconds. Such condition states are experienced at switching operations and atmospheric discharges. The system is composed of a gas tube surge arrester and a varistor. Both components have a very short response time which is reflected in a low protective residual voltage level. This provides an efficient protection of sensitive electronic devices.

1) Long duration overvoltage path

2) Transient (short duration) overvoltage path 

a) Current limiter

b) Gas tube

c) Thermal disconnector

d) Varistor