8/14/2019 Lightning Controllers MCD50B & MCD125B

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Surge protectionwith greater coordination

OBO Coordinated-LightningControllers

MCD 50-B and MCD 125-B/NPE

N E W

When combined with surge arrest-ers connected in series immediatelydownstream, the new OBO lightningarresters MCD 50-B and MCD 125-B/NPE ensure a coordinatedresponse, without the need for addi-tional decoupling elements. The fun-damental advantages of the innova-tive multi-carbon technology of OBOLightningControllers are fully pre-served.

The low protection level ( 1.3 kV)makes it unnecessary to installdecoupling inductances or to pro-vide additional lengths of conductorbetween lightning arresters (require-ment class B) and surge arresters(requi rement class C). This results ina space saving on installation of upto 45 per cent, a great advantagewhere compact EMC concepts areconcerned. In addition, the separateNPE spark gap at the surge arrester

(requirement class C) with compact TT and TN-S systems can be omit-ted.

Preferred fields of application for thenew OBO devices are compactsurge protection concepts in separatehousings and the installation of arresters of requirement classes Band C in a distribution board. Typicalapplications: compact mobile phoneinstallations.

d e a l fo r i n d u s t r y

a n d m o b i l e p h o n e

in s t a l l a t io n s

8/14/2019 Lightning Controllers MCD50B & MCD125B

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Type MCD 50-B MCD 125-B/NPE

Requirement class B (class I), N-PE lightning arrester,coordinated coordinated

Maximum continuous operating voltage U c 255 V 255 V

Discharge capacity (10/350 s) I imp 50 kA 125 kA

Protection level U p 1.3 kV 1.3 kV

Mains follow-up current quenchingcapacity of the arrester at U c 12.5 kA eff 100 kA eff

Max. asymmetric short-circuit current I p 25 kA Short-circuit strength(series fuse 500 A gL) U c 17.6 kA eff 17.6 kA eff Max. asymmetric short-circuit current I p 25 kA 25 kA

Order no. 5096 84 9 5096 86 5

L1

L2L3

F

N

MCD 50-B

PAS

MCD 125-B/NPE

V20-C

Decoupling distanceno longer necessary

L1

L2L3

F

N

MCD 50-B

PAS

MCD 125-B/NPE

V20-CPE

Decoupling distanceno longer necessary

L1

L2L3

F

PEN

MCD 50-B

PAS

V20-C

Decoupling distanceno longer necessary

TT network systems

TN-S network systems

TN-C-S network systems

OBO Coordinated-LightningControllersMCD 50-B and MCD 125-B/NPE

The advantagesLow protection level 1.3 kV.No need for a decoupling induc-tance or a length of conductorbetween arresters of requirementclasses B and C.Up to 45% space saving withcompact EMC concepts.Proven multi-carbon technology inthe LightningControllers.No sensitive trigger electronicsinside the lightning arresters.With compact TT and TN-Ssystems there is no need for theadditional NPE sum spark gap

with surge arresters of require-ment class C.

Technical data

MCD 50-B The specially doped insulating rings,which determine the precisely defined

spacing of the nine spark gaps,guarantee the low protection level (Up) 1.3 kV. As with the provenMC 50-B/VDE, the modular arrestermakes it possible to remove the upperpart without interrupting the main vol-tage, in order to measure the insula-tion re sistance in accordance with TAB2000.

MCD 125-B/NPE The MCD 125-B/NPE version is an

NPE spark gap intended to be in-stalled between the neutral conductor(N) and the protective earth conductor(PE). The low protection level ( 1.3kV)is achieved by a specially coordinatedprotection circuit.

Decoupling distanceno longer necessary