Branching isolator module QR Systems BI-04

Short-circuit isolator for the PLS line: 3 inputs, loop-powered, 0 address slots, automatic restoration of the section once the short is cleared.

197 900 UZS

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Interface

PLS

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Address slots

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PLS inputs

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Power supply

from the PLS line, 12–24 V

Specifications

Interface: PLS
Address slots: 0
PLS inputs: 3
Power supply: from the PLS line, 12–24 V
Current consumption: 0.5 mA in standby, 7 mA during a line short
Activation / restoration: 2 V ± 20 % / 3 V ± 20 %
Maximum current: 1 A through the closed switch
Operating temperature: −25…+55 °C
Housing: IP40, 80×32×21 mm, max 30 g
Average service life: 10 years

Description

The QR Systems BI-04 branching isolator module protects the PLS wired addressable line of a QR Systems addressable analogue fire alarm system against short circuit. When a short occurs on a section, the module isolates that section, the rest of the line keeps working, and once the fault is cleared the module restores communication automatically. The module is powered from the PLS line with no external source and occupies 0 address slots on the panel. Three PLS inputs allow ring, tree and mixed line topologies. LED indication shows the state of the line section on the module itself.

Advantages

Isolation of the shorted section and automatic restoration — one fault does not stop the whole line
0 address slots — the module uses none of the panel's address space
3 PLS inputs — ring, tree and mixed topologies
Powered from the PLS line: 0.5 mA in standby, 7 mA during a short — no external supply needed
Activation threshold 2 V ± 20 %, restoration 3 V ± 20 %, current through the closed switch up to 1 A
Operating temperature from −25 to +55 °C and IP40 housing — installation in unheated rooms

Applications

Branching and protecting the PLS line in QR Systems addressable analogue systems
Ring lines with isolated sections between groups of devices
Extended sites: warehouses, car parks, production buildings
Unheated rooms and service floors
Line branches to individual groups of detectors and modules

Frequently asked questions

Does the module occupy an address in the system?

The number of address slots occupied is 0: the module is logically passive and is powered from the PLS line, drawing no more than 0.5 mA in standby and 7 mA in the line short-circuit mode.

How does the module behave during a short circuit?

When the voltage on the section drops to 2 V ± 20 %, the isolator trips and disconnects the shorted section while the rest of the line keeps working. Once the fault is cleared and the voltage returns to 3 V ± 20 %, the module reconnects the section automatically.

Which line topologies are supported?

Three PLS inputs allow ring, tree and mixed layouts. Line voltage is 12 to 24 V, maximum current through the closed switch is 1 A, impedance no more than 0.12 Ohm.

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