DEHNbloc Maxi S

  • 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 (including 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


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3+1 application in a TT / TN-S system
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3-0 application in a TN-C system
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DEHNbloc Maxi 1 255 S

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

1 Product

Part No. 900220 DBM 1 255 S

GTIN 4013364106734, Customs tariff No.: 85363090, Gross weight: 730.70 g, PU: 1.00 pc(s)


Additional information

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
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

Brand: DEHN
Type: DBM 1 255 S
Part No.: 900220
or equivalent.



Circuit Interruption

The backup fuse is already integrated here. This means: reduced space requirement, lower installation costs, faster wiring, and shorter connecting cables. This concept can be found in the product ranges DEHNvenCI, DEHNbloc Maxi S, DEHNguard ... CI and V(A) NH...

Wave breaker function

In the case of spark-gap-based type 1 arresters, the entire current flows through the type 1 arrester during the discharge process. Like a wave breaker, the incoming energy is greatly broken down, which significantly relieves the downstream SPDs. All type 1 arresters in the Red/Line product range feature the WBF wave breaker function.

Technical data

SPD according to EN 61643-11 / IEC 61643-11 type 1 / class I
Max. continuous operating voltage (a.c.) (UC ) 255 V (50 / 60 Hz)
Lightning impulse current (10/350 µs) (Iimp ) 25 kA
Voltage protection level (UP ) ≤ 2.5 kV (including 80 cm connecting cable)
Max. mains-side overcurrent protection not required
Operating state indication by optical fibre cables via DSI E 3

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