Power Supplies

Power Supplies represent useful additions to many alarm panels. A system may sometimes need power beyond what is provided from a standard plug-in transformer. A power supply will regulate the amount of current that is provided and make sure that the voltage is kept in check. Buy power supplies here.
UltraTech 1240 Alarm Control Panel Battery Backup 12V 4.5Ah
UltraTech 1240
Alarm Control Panel Battery Backup 12V 4.5Ah
List Price: $20.00
Our Price: $11.99
Honeywell K0991 - AC Power Adapter 5VDC, 220mA
Honeywell K0991
AC Power Adapter 5VDC, 220mA
List Price: $20.00
Our Price: $14.99
Honeywell 1361-GT - AC Transformer 16.5VAC, 40VA
Honeywell 1361-GT
AC Transformer 16.5VAC, 40VA
List Price: $20.00
Our Price: $17.99
Honeywell LYNXRCHKIT-SC - LYNX Standard Capacity Backup Battery
Honeywell LYNXRCHKIT-SC
LYNX Standard Capacity Battery Backup
List Price: $20.00
Our Price: $18.99
Honeywell LYNXRCHKIT-SHA - LYNX Super High Capacity Battery Backup
Honeywell LYNXRCHKIT-SHA
LYNX Super High Capacity Battery Backup
List Price: $50.00
Our Price: $33.99
Honeywell AD12612 Auxiliary Power Supply
Honeywell AD12612
Auxiliary Power Supply
List Price: $30.00
Our Price: $18.99
UltraTech 1270
UltraTech 1270
Alarm Control Panel Battery Backup 12V 7Ah
List Price:
Our Price: $19.99
Honeywell LCP500-24B - Lyric Controller 24-hour battery
Honeywell LCP500-24B
Lyric Controller 24-hour battery
List Price:
Our Price: $38.99
MaxPowerCell CR123a - 3V lithium battery
MaxPowerCell CR123a
3V lithium battery
List Price: $4.00
Our Price: $2.99
Taxons
DSC HSM2300
Auxiliary Power Supply for PowerSeries NEO
List Price:
Our Price: $62.99
Taxons
Qolsys QR0029-840
IQ Panel 2 Power Supply Transformer 5.5VDC
List Price:
Our Price: $15.99
Taxons
Qolsys QR0051-840
7 VDC Transformer for IQ2 Panel
List Price:
Our Price: $20.99

External power supplies are used when an alarm system needs additional power beyond what is supplied from a plug-in transformer. This usually refers to sensors and accessories rather than an alarm control panel. Normally, a panel can get all the power it needs from a plug-in transformer. However, the same cannot always be said for the additional accessories and other equipment. This is often true for larger hardwired system, where every device feeds power off the panel. If you use a large number of devices, you may need additional power from an external power supply.

When it comes to hardwired alarm panels, there is only so much power current that the panel can supply to all the accessories. Each accessory will draw a certain amount of current from the panel. This applies to security and life-safety sensors, as well as accessories. Sensors include devices like motion sensors and glass break detectors. Accessories include devices like keypads and sirens. In all of these cases, some power must be applied for the device to work properly.

In many cases, the device may draw a smaller amount of system power before it is activated. An example is a keypad. When the keypad is left idle it is drawing a much smaller amount of power from the panel than when it is activated and in use. You need to consider both the idle current draw to keep the device powered on and the maximum current draw that the device will utilize when it is activated and in regular use. Make sure to consider the maximum calculated current draw for all your equipment, or you could run into problems.

If you find that your equipment is going to exceed the maximum available current for your alarm panel, then you will need to obtain an external power supply. These devices also receive primary power from a plug-in transformer. A backup battery is also usually used with an external power supply to keep the device running in the event of an electrical outage. You will then use the power supply with any equipment that requires supplementary power beyond what the alarm panel can normally provide.

In particular, hardwired sirens often exceed the maximum current draw that the panel is able to provide on its own. Even if the panel has a trigger output, you will still need additional power from an external power supply to get the siren to activate during alarm events. You will also normally need a relay. This relay will tell the power supply to start supplying current to the siren when an alarm event occurs. The relay will also tell the power supply to cut power to the siren when the alarm is cleared. This is necessary for getting the siren to stop sounded after you have disarmed the system.

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