Specifications
11
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Power Supplies
Selecting Power Supplies
SPS2454
SPS2425
SPS2410
SPS2406
PRS2403
Switch Mode and Linear Power Supplies
To Select Power Supplies
For Your System:
Switch Mode Power Supplies
The SPS versions of power sup-
plies use switching technology to
provide large current capacities
in very small packages. Unlike
more conventional linear power
supplies that use large and heavy
transformers, switching supplies
gate energy directly to the storage
caps at the power supply output.
This is a highly efficient way to
convert voltages and because of
this the power supplies generate
very little heat.
Mounting Holsters
Most wall-mounted SPS versions
of power supplies come with
special mounting holsters for
easy and secure wall mounting.
The holsters are fastened to the
wall and then the power supply
is slipped in. A broad spring
tang ensures the power supply
remains snug in the holster.
A side-mounted PCB provides a
means of breaking out the power
supply’s cable connector into
multiple screw terminals. The
screw terminals are also pluggable
for added ease of installation.
Understanding Current Units
Paging systems are made up of
equipment that consume or pro-
vide operating current. To operate
properly, the system needs to
provide at least as much current
as it consumes.
Each product has a Current
Units number. This number is
either positive, negative, or zero
to indicate how much current it
provides or consumes from the
system’s power supplies.
Note: One Current Unit = 50 mA, 24V DC
108
50
12
108
50
12
108
5050
12
108
50
12
108
50
12
1. Add all the numbers together.
2. Select a Power Supply (or power supplies) with a number(s)
equal to or greater than the total amount.
SSPPSS22445544
MMooddeell
SSPPSS22442255
+108
24V DC
Holster
Pluggable
3-
1
⁄2" W X 7-
3
⁄4"H X 2"D
@ 5.40A Terminal Strip
+50
24V DC
Holster
Pluggable
3" W X 5-
3
⁄4"H X 1-
3
⁄4"D
@ 2.50A Terminal Strip
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SSPPSS22441100
+20
24V DC
Holster
Pluggable
2-
1
⁄2" W X 4-
1
⁄4"H X 1-
1
⁄4"D
@ 1.00A Terminal Strip
SSPPSS22440066
+12
24V DC
Receptacle
Wires,
2" W X 3-
3
⁄8"H X 1-
1
⁄4"D
@ 0.60A
Barrel-Type
PPRRSS22440033
+6
24V DC
Receptacle
Wires,
2-
1
⁄4" W X 3-
1
⁄4"H X 2"D
@ 0.30A
Barrel-Type
3 lb.
2 lb.
2 lb.
2 lb.
1 lb.
108
50
12
108
50
12
108
50
12
108
50
12
108
50
12
Power Supplies
108
50
12
Provides
System Current
108
50
12
Consumes
System Current
108
50
12
No Draw
on the System
• UL, all models listed for US; also Canada (except PRS2403)