DEHNbloc Maxi S

Coordinated Lightning Current Arrester for Busbars

For protecting low voltage consumer's installations against surges and even direct lightning strikes. For installation in conformity with the lightning protection zone concept at the boundaries from 0A– 1.
  • Spark-gap-based lightning current arrester with integrated lightning current carrying backup fuse in a compact enclosure
  • Directly mounted on the PEN / N busbar
  • Low voltage protection level UP 2.5 kV (includung 80 cm connecting cable)
  • Directly coordinated with DEHNguard surge protective device without additional cable length
  • Short-circuit withstand capability of 100 kArms (220 kApeak)
  • High follow current extinguishing capability and limitation due to RADAX Flow technology
  • High lightning current discharge capacity
  • With optical-fibre interface for SPD monitoring

Version

DEHNbloc Maxi 1 255 S: Coordinated lightning current arrester with integrated backup fuse for busbar installation

Details

DEHNbloc Maxi S can be easily integrated into the application environment of a low-voltage switchgear installation or distribution board.
Thanks to its unique mechanical design, the coordinated DEHNbloc Maxi S lightning current arrester can be directly mounted on the PEN / N busbar of a switchgear installation without the need for additional adapters.
With the backup fuse integrated in the device, no other separate backup fuses need to be installed.
Installing DEHNbloc Maxi S directly into the connection panel of a switchgear installation upstream of the circuit breaker ensures short cable lengths of the arresters and a low voltage protection level for the installation. In this environment, the VDE-tested DEHNbloc Maxi S can be used for short-circuit currents up to 100 kArms.
With a discharge capacity of 25 kA (10/350 µs), DEHNbloc Maxi S fulfils the highest national and international lightning protection standards for all three-phase current applications in TN and TT systems.
For 3+1 configurations, DEHNgap Maxi S provides a powerful creepage discharge spark gap with a discharge capacity of 100 kA (10/350 µs).
DEHNbloc Maxi S also features patented RADAX Flow follow current limitation, thus ensuring selectivity even in case of low-current-rated fuses.
The capability to conduct lightning impulse currents without destruction and to suppress mains follow currents without tripping upstream overcurrent protective devices ensures the availability of the switchgear installation in the event of a lightning strike. This considerably reduces the risk of arc formation in the installation.
In conjunction with the DEHNsignal remote signalling system, the operating state of DEHNbloc Maxi S devices can be monitored at any time.
Easy-to-implement optical transmission to the DEHNsignal E 3 remote signalling receiver module ensures safe electrical isolation between the power circuit and the remote signalling circuit.

Figure 1 and 2

Application 1 and Application 2

3+1 application in a TT / TN-S system3-0 application in a TN-C system

Models

DEHNbloc Maxi 1 255 S

DEHNbloc Maxi 1 255 S

Basic circuit diagram DBM 1 255 SDimension drawing DBM 1 255 S

Coordinated single-pole lightning current arrester with integrated backup fuse for busbar installation in 230 / 400 V systems.


Specifications

Type
Part No.
SPD according to EN 61643-11 / IEC 61643-11
Nominal voltage (a.c.) (UN)
Max. continuous operating voltage (a.c.) (UC)
Lightning impulse current (10/350 µs) (Iimp)
Specific energy (W/R)
Voltage protection level (UP)
Follow current extinguishing capability (a.c.) (Ifi)
Follow current limitation / Selectivity
Response time (tA)
Short-circuit withstand capability (ISCCR)
Max. mains-side overcurrent protection
Rated breaking capacity of the internal backup protection
Temporary overvoltage (TOV) (UT) – Characteristic
Operating temperature range (TU)
Number of ports
For mounting on
Connection
Enclosure material
Place of installation
Dimensions (W x H x D)
Operating state indication
Extended technical data:
– Max. prospective short-circuit current
– Limitation / Extinction of mains follow currents
Weight
GTIN
PU
Part No.
  • DBM 1 255 S
  • 900 220
  • type 1 / class I
  • 230 V (50 / 60 Hz)
  • 255 V (50 / 60 Hz)
  • 25 kA
  • 156.25 kJ/ohms
  • ≤ 2.5 kV (including 80 cm connecting cable)
  • 50 kArms
  • no tripping of a 32 A gG fuse up to 50 kArms (prosp.)
  • ≤ 100 ns
  • 100 kArms (220 kApeak)
  • not required
  • 100 kA
  • 440 V / 120 min. – withstand
  • -40 °C ... +80 °C
  • 1
  • PEN / N busbars min. 35 mm2
  • cable lug min. 35 mm² / max. 50 mm²
  • thermoplastic, red, UL 94 V-0
  • indoor installation
  • 72 x 89 x 100 mm
  • by optical fibre cables via DSI E 3
  • Use in switchgear installations with prospective short-circuit currents of more than 50 kArms (tested by the German VDE)
  • 100 kArms (220 kApeak)
  • up to 100 kArms (220 kApeak)
  • 699 g
  • 4013364106734
  • 1 pc(s)
  • 900 220
  • Specifications (PDF)
  • More
    • Further Pictures
      Basic circuit diagram DBM 1 255 S
      open PDF
      Dimension drawing DBM 1 255 S
      open PDF
      Further Information
      Product Specifications (Text)

      Back

      Coordinated DEHNbloc Maxi 1 255S lightning current arrester
      Coordinated single-pole lightning current arrester 
      with integrated backup fuse for industrial busbar systems
      Type 1 SPD according to EN 61643-11
      RADAX Flow spark gap technology for follow current
      limitation
      Max. continuous operating voltage: 255 V a.c.
      Voltage protection level:	<= 2.5 kV 
      (including 80 cm connecting cable)
      Lightning impulse current (10/350): 25 kA
      Follow current extinguishing capability: 50 kArms
      Rated breaking capacity of the integrated backup protection: 
      up to 100 kArms
      Energy-coordinated with arresters of the Red/Line series 
      according to IEC 62305-4 
      Installation on PEN / N busbars min. 25 mm2 
      Dimensions (W x H x D): (72 x 89 x 100) mm
      Degree of protection: IP 5X

      delivery and installation.

      Brand: DEHN + SÖHNE
      Type: DBM 1 255 S
      Part No.: 900 220

      or equivalent.
      Installation Instructions
      Certificates
      CE_DBM_1_255_S
      CAD-Data for registered Users
      900220.stp
      900220.igs
      900220.jt
      900220.dwg
      900220m_D.dxf

Accessories

DEHNsignal E 3

Receiver module for optical transmission for selective operating state indication / centralised fault indication of three coordinated DEHNbloc Maxi S and, where appropriate, DEHNgap Maxi S lightning current arresters in five-wire systems.

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Specifications

Type
Part No.
Supply a.c. voltage (UN)
Weight
GTIN
PU
  • DSI E 3
  • 910 631
  • 230 V
  • 114 g
  • 4013364108196
  • 1 pc(s)
  • Specifications (PDF)
  • More
    • Further Pictures
      open PDF
      Further Information
      Product Specifications (Text)

      Back

      DEHNsignal E3 DSI E3 receiver module for optical transmission
      Receiver module for optical transmission for selective 
      operating state indication / centralised fault indication 
      of three coordinated DEHNbloc Maxi S and, where appropriate,
      DEHNgap Maxi S lightning current arresters in five-wire
      systems
      With remote signalling contact, width: 1.5 modules
      Supply voltage: 	230 V a.c.
      Power input: 	< 550 mW
      Backup fuse: 16 A gL/gG or C 16 A
      Signal input: 3x via optical fibre plug-in system 
      (LWL ST DSI)
      Operating state indication: green LED
      Selective status indication: 3 x red LED (L1, L2, L3) 

      delivery and installation.

      Brand: DEHN + SÖHNE
      Type: DSI E 3
      Part No.: 910 631

      or equivalent.
      Installation Instructions

LWL DSI 18M

18 metres of plastic optical fibre cable, preferably for use with DEHNbloc Maxi S.

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Specifications

Type
Part No.
Diameter
Length
Weight
GTIN
PU

LWL ST DSI

Plug for plastic optical fibre cables.

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Specifications

Type
Part No.
Diameter
Weight
GTIN
PU