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Convenient and flexible installation

The range of N 125 power supplies from

Siemens offers currents of 160 mA,

320 mA and 640 mA. All of them use the

same housing, ensuring easy interchange

and therefore fast and convenient

upgrading of power supply to the buil-

ding systems. Two 640 mA power sup-

plies can be connected in parallel, thus

delivering 1,280 mA to a maximum of

128 bus users in one line. Both power

supplies can be installed in the same con-

trol panel – with no need for observing a

certain clearance between the lines.

What’s more, every N 125 is capable of

powering consumers via the built-in

DC 29 V power pack.

Answers for infrastructure.

No extra battery required

All N 125 models operate not only on

AC 102...253 V, but also on DC 176...

270 V. This means that the power sup-

plies are also suited for use in plants

equipped with a central battery for

backup, e.g. for emergency lighting.

An existing emergency power supply sys-

tem can also be used for powering the

bus. The N 125 ensure that status, war-

ning and alarm messages can always be

forwarded via bus, even in the event of a

general power failure or when operating

in emergency mode.

Reliable power supplies for all

electrical power requirements

KNX powered by existing emergency power supply system

Highlights

■

Flexible exchange plus fast and

easy upgrading – thanks to

identical housings

■

Straightforward installation –

thanks to parallel connection,

with no need for observing

minimum clearances between

the different power supplies

■

Very versatile – owing to broad

range of input voltage of

176...270 V (e.g. suited for

power supply in emergency

mode (DC

220 V)

■

Compact supply permits additi-

onal infeed of KNX loads

The world-

wide standard

for home and

building

control

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Summary of content (4 pages)

PAGE 1
© Siemens AG 2012 The worldwide standard for home and building control Reliable power supplies for all electrical power requirements KNX powered by existing emergency power supply system Convenient and flexible installation The range of N 125 power supplies from Siemens offers currents of 160 mA, 320 mA and 640 mA. All of them use the same housing, ensuring easy interchange and therefore fast and convenient upgrading of power supply to the building systems.
PAGE 2
© Siemens AG 2012 Reliable power supply in all situations Application: Emergency lighting with security power supply In normal operation, a central program checks automatically the operational readiness of the lamps and electronic ballasts of the emergency lamps. Fault status messages are forwarded to the building automation and control system.
PAGE 3
© Siemens AG 2012 System Products Power supply units ■ Technical specifications N 125/02 N 125/12 N 125/22 ✔ ✔ ✔ 4 MW 4 MW 4 MW Integrated choke ✔ ✔ ✔ Bus connection via contact system to data rail ✔ ✔ ✔ Bus connection via bus terminal ✔ ✔ ✔ Enclosure data Modular installation devices for mounting on TH35 mounting rail acc. to EN 60715 Dimensions • Dimensions (1 MW = 18 mm) Bus connection Outputs Rated operational voltage 50...60 Hz AC V 120 ... 230 120 ... 230 120 ...
PAGE 4
© Siemens AG 2012 Siemens Switzerland Ltd Infrastructure & Cities Sector Building Technologies Division International Headquarters Gubelstraße 22 6301 Zug Switzerland Tel. +41 41 724 24 24 The information in this document contains general descriptions of technical options available, which do not always have to be present in individual cases. The required features should therefore be specified in each individual case at the time of closing the contract.