Bosch FLM-325-ISO Specsheet

Fire Alarm Systems | FLM‑325‑ISO Short Circuit Isolator

FLM‑325‑ISO Short Circuit Isolator

www.boschsecurity.com

u Automatic verification of data line for short circuit

u Contacts are rated to 1 A at 30 VDC

u Can be placed at any location on SLC loop

The FLM‑325‑ISO Short Circuit Isolator isolates a
shorted section on a specific polling circuit from the
rest of the system to minimize the loss of devices.
It fits into a standard 4-inch square or double‑gang
electrical back box.

Functions

Basic Operation

If a short condition occurs, the two adjacent isolators
activate and their respective LED turns on. This action
prevents the entire polling circuit from becoming
disabled. Upon removal of the shorted condition, the
isolators automatically return to the normal operating
state.

Start-up Delay

When power is applied or after a short is removed,
detectors and devices cannot begin communicating
with the fire panel until they are sufficiently charged.
Because the isolator must first charge the devices that
are connected down the polling circuit, a start-up
delay of approximately 30 s occurs when a full circuit
of devices or detectors is connected to a single
isolator without an optional loop circuit return
(Class B, Style 4). During charging, the LED remains
on.

u 256 devices at maximum per loop for Class A

(Style 7)

u Yellow LED provides data line status

Status display

In case of a short circuit the isolator activates and the
yellow LED turns on.

Certifications and approvals

Region Certification

USA UL UOXX: Control Unit Accessories, System

(ANSI/UL 864)

CSFM see our website

Installation/configuration notes

Compatibility Information

The following products are compatible with the
FLM‑325‑ISO Short Circuit Isolator:

Category Product ID Product Description

Fire Panels FPA‑1000 Analog Addressable Fire Panels

Class A, Style 7 Wiring

The isolator can be located between any devices on
the SLC loop. In the event of a short circuit on the SLC
loop, the two adjacent isolators (closest isolators to
the left and right of the shorted section) will activate
and their respective LED indicators will be turned on.

2 | FLM‑325‑ISO Short Circuit Isolator

All devices between the active short circuit isolators
will be disconnected from the loop. This will prevent
entire loop failure. After removal of the short circuit
condition, the isolator goes back to normal and the
fire panel restores the entire loop to normal operating
state.

Class B, Style 4 Wiring

The isolator can be located between any devices on
the SLC loop. In the event of a short circuit on SLC
loop, an isolator closest to the shorted section will
activate and the LED will be turned on.
All the devices beyond the shorted section will be
disconnected. After removal of the short circuit
condition, the isolator will automatically restore the
entire loop to the normal operating state.

Wiring

Notice

All wiring must conform to local codes, ordinances
and regulations.

1. Install module wiring in accordance with job drawings
and appropriate wiring diagram.

2. Secure the module to an approved electrical box
(supplied by installer).

Ordering information

FLM‑325‑ISO Short Circuit Isolator

Isolates a shorted section on a specific polling circuit
from the rest of the system to minimize the loss of
communication

Order number FLM-325-ISO

Parts included

Quant. Component

1 FLM‑325‑ISO Short Circuit Isolator

1 Wall plate

1 Literature pack

Technical specifications

Electrical

Input Voltage 17 VDC to 41 VDC

Current Consumption

• Standby 0.27 mA

• Active (LED on) 10 mA

Mechanics

Dimension (H x W x D) 4.7 in. x 4.2 in. x 1.4 in.

Weight 1.4 oz (39.7 g)

LED indication Yellow

Maximum number per loop 127

(11.9 cm x 10.7 cm x 3.6 cm)

Environmental Conditions

Operating Temperature +32°F to +120°F (0°C to +49°C)

Relative Humidity 90 %, non‑condensing