POWER SUPPLY SYSTEMSLIGHTNING CURRENT ARRESTERS – TYPE 1

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For protection of low voltage consumer’s installations against surgeseven at direct lightning strikes. For use in the lightning protection zonesconcept at boundaries 0A – 1.

• Encapsulated RADAX Flow spark gapwith high follow current limitation

• No tripping of 32/35 A gL/gG fuses

• Coordinated directly with DEHNguardsurge protective device without addi-tional cable length or decoupling coil

• Low protection level

• Allows installation upstream of supplymeters thanks to its high insulationresistance

• Double terminals for serial connection

• Multifunctional connection for conductors and busbars

• Available with operating voltage indication

DBM 1 255: Coordinated, single-pole lightning currentarrester with high follow current limitation

DBM 1 255 L:Coordinated, single-pole lightning currentarrester with high follow current limitationand operating voltage indication

DEHNbloc® MaxiCoordinated Lightning Current Arrester

The coordinated lightning current arresters of the DEHNbloc Maxi familyadjust themselves to every kind of application. Whether being used in anexposed position or in rough industrial applications: DEHNbloc Maxialways offers the right solution. The single-pole devices are originallycoordinated with the approved DEHNguard surge arresters of theRed/Line family. Independent from cable lengths and without requiringadditional decoupling coils, the surge protection concept can be adaptedindividually to all conditions at the installation.

DEHNbloc Maxi devices provide the patented technologies of an encap-sulated creepage discharge spark gap and RADAX-Flow follow currentlimitation. Special safety distances from busbars or equipment belong tothe past as well as tripped backup fuses due to lacking selectivity bet-ween the protective device and overcurrent protection. This ensures thehighest possible system availability.

For indicating the presence of phase voltages and readiness for operationon site, DEHNbloc Maxi Type DBM 1 255 L provides an integrated opera-ting voltage indication. Optionally, DEHNbloc Maxi devices can also be

used for signalling the readiness for opera-tion of the equipment as well as the pre-sence of operating voltage to a superiorcontrol system via remote signalling con-tact.

Using the double terminalsof DEHNbloc Maxi devices,which are suitable for alltypes of conductors, allowsto realise a serial connecti-on up to nominal currentsof 125 A in a space- andcost-saving way, as prefer-red by standard IEC 60364-5-53. The multifunctionalterminal is suitable forsimultaneous connection ofconductors and a busbars.This allows an easy wiringto other DIN rail mounteddevices.

SPD Type 1 according to EN 61643-11;Classification B according to E DIN VDE 0675-6;SPD Class I according to IEC 61643-1;

POWER SUPPLY SYSTEMSLIGHTNING CURRENT ARRESTERS – TYPE 1

40 www.dehn.de

DEHNbloc® MaxiDBM 1 255 (L)

900 025 DBM 1255900 026 DBM 1255 L

DBM 1 255 DEHNblocMaxi 1, 25 kA 900 025DBM 1 255 L DEHNblocMaxi 1 with operation indicator, 25 kA 900 026

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Basic circuit diagram DBM 1 255 L Dimension drawing DBM 1 255 (L)

DBM 1 255: Coordinated lightning current arrester with high follow current limitation.DBM 1 255 L: Coordinated lightning current arrester with high follow current limitation and

operating voltage indication.

DBM 1 255 DBM 1 255 L

SPD according to EN 61643-11 Type 1 Type 1

SPD according to IEC 61643-1 Class I Class I

Classification according to E DIN VDE 0675-6 B B

Max. continuous ac voltage UC 255 V 255 V

Lightning impulse current (10/350) Iimp 25 kA 25 kA

Nominal discharge current (8/20) In 25 kA 25 kA

Voltage protection level UP ≤ 2.5 kV ≤ 2.5 kV

Follow current extinguishing capability Ifi 25 kArms 25 kArms

Follow current limitation / Selectivity no tripping of a 35 A gL/gG fuse up to 25 kArms (prosp.) no tripping of a 35 A gL/gG fuse up to 25 kArms (prosp.)

Response time tA ≤ 100 ns ≤ 100 ns

Max. backup fuse (L) up to IK = 25 kArms 315 A gL/gG 315 A gL/gG

Max. backup fuse (L) at IK > 25 kArms 200 A gL/gG 200 A gL/gG

Max. backup fuse (L-L´) 125 A gL/gG 125 A gL/gG

TOV voltage UT 335 V / 5 sec. 335 V / 5 sec.

Operating temperature range (parallel wiring) TUP -40°C...+80°C -40°C...+80°C

Operating temperature range (through-wiring) TUS -40°C...+60°C -40°C...+60°C

Cross-sectional area (L, L´, N/PEN) min. 10 mm2 solid / flexible 10 mm2 solid / flexible

Cross-sectional area (L, N/PEN) max. 50 mm2 stranded / 35 mm2 flexible 50 mm2 stranded / 35 mm2 flexible

Cross-sectional area (L´, N/PEN) max. 35 mm2 stranded / 25 mm2 flexible 35 mm2 stranded / 25 mm2 flexible

Mounting on 35 mm DIN rail acc. to EN 60715 35 mm DIN rail acc. to EN 60715

Enclosure material red thermoplastic, UL 94 V-0 red thermoplastic, UL 94 V-0

Degree of protection IP 20 IP 20

Dimension 2 mods., DIN 43880 2 mods., DIN 43880

Operation indicator — green light

Ordering information

Type DBM 1 255 DBM 1 255 L

Part No. 900 025 900 026

Packing unit 1 pc(s) 1 pc(s)

Accessory Part for DEHNbloc® Maxi

DEHNsignal DVDSI DV: Remote signalling module for

– multipole SPDs with 4-wire interface “DSI DV”(e.g. DEHNventil TNC / ... TNS / ... TT)

– single-pole SPDs with single-wire interface “DSI DV” in TN-S and TT systems (e.g. DEHNbloc Maxi)

PU PartType pc(s) No.DSI DV 1 910 620

910 620 DSI DV

DSI DVDEHNsignal 910 620

Accessory Part for DEHNbloc® Maxi

DEHNsignal DBMDSI DBM: Remote signalling module for single-pole SPDs with single-wire interface “DSI DV” in TN-C systems (e.g. DEHNbloc Maxi)

PU PartType pc(s) No.DSI DBM 1 910 623

910 623 DSI DBM

DSI DBMDEHNsignal DB M Remote Signalling Module 910 623

© DEHN + SÖHNE GmbH + Co. KG · Hans-Dehn-Str. 1 · Postfach 1640 · D-92306 Neumarkt · Tel. +499181 906-0 · www.dehn.de

3, tested : Tested +: New (: Discontinued Model

Product Data Sheet: DEHNbloc® M

DB M 1 255 (961 120)■ Coordinated spark-gap-based lightning current arrester consisting of a base part and plug-in protection module■ Maximum system availability due to RADAX Flow follow current limitation■ Directly coordinated with DEHNguard surge protective devices without additional cable length

Figure without obligation

Basic circuit diagram DB M 1 255 Dimension drawing DB M 1 255

Coordinated modular single-pole ightning current arrester with high follow current limitationType DB M 1 255  Part No. 961 120  SPD according to EN 61643-11 Type 1 SPD according to IEC 61643-1/-11 Class I Max. continuous operating a.c. voltage (UC) 255 V Lightning impulse current (10/350 µs) (Iimp) 50 kA Specific energy (W/R) 625.00 kJ/ohms Nominal discharge current (8/20 µs) (In) 50 kA Voltage protection level (UP) ≤ 2.5 kV Follow current extinguishing capability a.c. (Ifi) 50 kArms Follow current limitation/Selectivity no tripping of a 32 A gL/gG fuse up to 50 kArms (prosp.) Response time (tA) ≤ 100 ns Max. backup fuse (L) up to IK = 50 kArms (ta ≤ 0.2 s) 500 A gL/gG Max. backup fuse (L) up to IK = 50 kArms (ta ≤ 5 s) 315 A gL/gG Max. backup fuse (L-L') 125 A gL/gG Temporary overvoltage (TOV) (UT) 440 V / 5 sec. TOV characteristic withstand Operating temperature range (parallel connection) (TUP) -40°C...+80°C Operating temperature range (series connection) (TUS) -40°C...+60°C Operating state/fault indication green / red Number of ports 1

Cross-sectional area (L/N, L'/N', N/PE (N)) (min.) 10 mm2 solid/flexible

Cross-sectional area (L/N, N/PE(N)) (max.) 50 mm2 stranded/35 mm2 flexible

Cross-sectional area (L'/N') (max.) 35 mm2 stranded/25 mm2 flexible For mounting on 35 mm DIN rails acc. to EN 60715 Enclosure material thermoplastic, red, UL 94 V-0 Place of installation indoor installation Degree of protection IP 20 Capacity 2 module(s), DIN 43880 Approvals VDE, KEMA, UL

Extended technical data:Use in installations with prospective short-circuit

currents of more than 50 kArms (tested by VDE) – Maximum prospective short-circuit current 100 kArms (220 kApeak) – Limitation/extinction of mains follow currents up to 100 kArms (220 kApeak) – Max. backup fuse (L) up to IK = 100 kArms (ta ≤ 0.2 s) 500 A gL/gG – Max. backup fuse (L) up to IK = 100 kArms (ta ≤ 5 s) 315 A gL/gG Weight 340 g Customs tariff number 85363030 GTIN 4013364118614 PU 1 pc(s)

We reserve the right to introduce changes in performance, configuration and technology, dimensions, weights and materials in the course of technical progress. The figures are shown without obligation.