© 2011 UTC Fire & Security. All rights reserved. 1 / 2 P/N 3101877 • REV 1.0 • ISS 14JUN11
ISM-95 Isolator Module Installation Sheet
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EN: Installation Sheet
Description
The ISM-95 Isolator Module provides short circuit protection for
an addressable loop. When a short circuit is detected on the
fire panel loop on either side of the isolator, that side will be
isolated and the yellow "isolated" LED will turn on. When the
short clears, the isolator automatically resets and reconnects
the loop.
If required, one additional device can be connected to a short
spur connection. A device connected to the short spur
connection will continue to receive power from the one side of
the loop and remain operational in case of a short circuit on the
loop. A short circuit on the spur will short circuit both sides of
the loop (bypass the isolator).
Installation
The ISM-95 is designed for use in dry environments. The
module is supplied in an IP55 enclosure. Mount the enclosure
at a suitable location, and then connect the field wiring in
accordance with “Connections.”
Connections
The incoming addressable loop can be connected to either set
of Loop + and Loop – terminals (1 and 2 or 5 and 6) shown in
Figure 1.
The outgoing addressable loop is connected to the remaining
set of Loop + and Loop – terminals (5 and 6 or 1 and 2). Do not
mix connections between the incoming and outgoing.
If an additional device is to be used on a spur, it must be
connected to terminals S+ and S– shown in Figure 1.
Figure 1 shows connections for the ISM-95.
1. Loop +
2. Loop –
3. Spur connection+ (S+)
4. Spur connection– (S–)
5. Loop +
6. Loop –
7. Isolator LED
Maintenance
The only maintenance required is a yearly inspection. Do not
modify the internal wiring or circuitry.
Specifications
Operating temperature 0 to +50°C
Operating voltage 24 VDC
Switching voltage
(normal to isolated)
13.8V
IP rating IP55
Dimensions (W × H × D) 43 × 89 × 37 mm
Weight 147 g
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