Surge protection device for power supply systems MERSEN
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General information
Ordercode YESSS
4306-7779 
Product code
83020143
EAN code
38435297851739
Product group
Surge protection device for power supply systems
Brand
MERSEN
Type
STPT2-40K440V-3PM
surge arrester type 2 40kA Uc440V 3+0 IT TNC 3-pole
surge arrester type 2 40kA Uc440V 3+0 IT TNC 3-pole 3 module plugin IR
Product description
STP T2 40 is the series of Type 2/Class II devices for discharging voltage surges, in accordance with EN/IEC 61643-11 and certified UL 1449 4th Ed. Suitable for the second stage of protection in supply distribution panels in which Type 1 protection devices are installed upstream, or for the first stage of protection in commercial or other applications not exposed to direct strikes and with no external lightning protection system.
Product specifications
System configuration DC
No
System configuration IT
Yes
System configuration TN
No
Nominal discharge surge current (8/20)
20 kA
System configuration TN-C
No
Max. continuous voltage AC
440 V
System configuration TN-C-S
No
Nominal voltage AC
690 V
System configuration TN-S
No
System configuration TT
No
System configuration other
No
Voltage protection level
2 kV
Number of conductors (without earthing)
3
Voltage protection level L-N
2 kV
Mounting method
DIN rail (top hat rail) 35 mm
Short-circuit breaking capacity (Isccr)
25 kA
Construction size
3 modular spacing
Max. discharge surge current (8/20)
40 kA
Max. conductor cross section solid (solid, stranded)
35 mm²
With remote signalling contact
Yes
Max. conductor cross section flexible (fine-strand)
25 mm²
Signalling at the device
Optical
Category type 2
Yes
Degree of protection (IP)
IP20
Integrated backup fuse
No
Max. overcurrent protection device, parallel connection (fuse)
125 A
Max. overcurrent protection device, series connection (fuse)
125 A
Integrated short-circuit protection
No
Leakage-current free
No
Product information