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Fire Alarm Systems | FLM‑I 420‑S Short Circuit Isolator

The Short Circuit Isolator isolates alarm zones in which a

short circuit has occurred. This means the functionality of

the remainder of the network remains preserved.

System Overview

b1+ a- b2+ N/A N/A N/A

LSN

9 1

6 4

7 3

8 2

0

5

8 2

0

5

6 4

9 1

7 3

CL 1

2

0

Description Connector

b1+ / a- / b2+LSN

N/A (3 x)free terminals, e.g. for looping through ext. auxiliary volt-

age and for shielding

Functions

Features of improved LSN

The interface modules in the 420 series offer all the

features of improved LSN technology:

•Flexible network structures including T‑tapping

without additional elements

•Up to 254 LSN-improved elements per loop or stub

line

•Unshielded cable can be used

Address switch (rotary switch)

The address of the Short Circuit Isolator is set using the

rotary switches.

The following settings are possible:

0 0 0Loop/stub in LSN mode improved version with automatic

addressing (T-tap system not possible)

0 0 1 - 254Loop/stub/T-tap system in LSN mode improved version

with manual addressing

CL 0 0Loop/stub in classic LSN mode

Configuration

The Short Circuit Isolator isolates alarm zones in which a

short circuit has occurred. The following illustrations

show typical configurations of the isolator module.

FLM‑I 420‑S Short Circuit Isolator

▶Rotary switch for automatic and manual address

setting

▶Preservation of LSN loop functions in the event of a

short-circuit by two integrated isolators

▶Power supply via LSN

▶Three free screw terminals

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