ALARM WITH LOUD BUZZER and flashing LED light triggered by any contact close.

Alarm Box with relay
Alarm with buzzer and flashing LED light features
  • Flashing beacon LED is visible in daylight.

  • Loud warbling tone cuts through the loudest industrial noise.

  • Rugged. Built for rough, wet and corrosive environments.

  • Illuminated push button indicates power.
  • Compact – box measures only 5 x 5 x 2 inches.

  • Relay Output – 15A  @ 120 VAC relay.

  • Waterproof enclosure is rated for outdoor use. (IP65)

  • Snooze alarm – buzzer repeats every 30 mins if deisred.

Alarm with buzzer and flashing LED light

takes an input from sensing devices such as a float switches, reed switches, or limit switches, and turns it into an audio and visual alarm that can’t be ignored. Powered by 120VAC or any other line voltage. Also includes a relay output to power other devices that can be conveniently plugged into the plug included.


When the alarm box senses a contact close, (or contact open) there is a slight delay meant for sloshing liquids, then the buzzer sounds and the beacon flashes.  When this happens, the annunciation buzzer can be silenced by pressing the front button. After this, the beacon light continues to flash as a reminder until the alarm condition is corrected. When the alarm condition is cleared, the alarm resets automatically so its ready for the next alarm. There are several alternate behaviors available.

  • A “snooze-alarm” mode repeats the buzzer output every 30 minutes. (can be disabled on the PCB)
  • N.O or N.C. relay.
  • Manual or automatic reset.
  • Pushbutton tests the circuit when unit is not actively alarming.


  • Waterproof enclosure is rated IP65. (NEMA 4X)
  • Installation is as simple as connecting to your device’s contact close (or open) to the communications cable, and then plug in the power cord.
  • 15A relay switches a load using either our piggyback plug, or else a standard drop cord. (with model AB-3R)
  • Either model is field settable to N.O or N.C. 
  • Compact enclosure is 5x5x2″. 


The alarm boxes with buzzer and flashing LED light include a 10 foot cable to connect to your contact close device.  If more length is needed, this is an option in the ordering section at the bottom of this page. (So if 10 feet is ordered, this will be in addition to the 10 feet that is included, for a total of 20 feet of cable)
The alarm boxes are configured out of the box to alarm on contact open. This can be changed by setting the DIP switches according to the instructions below.

 Models Available

AB-2R has a 10 foot cord with a piggyback plug on the end. 

AB-3R models do not use a piggyback cord but instead use two separate cords – a power input cord and a n 8″ drop cord. (or pigtail cord)  

A miniature stack light can be added to either model for more visible status. This feature is designated with the suffix –S2. (so AB-3R-S2 with stack light would be for example)  go to AB-3R-S2 page

Alarm box - relay output and buzzer
Alarm Box with buzzer and flashing LED

We use these alarms in many of our products such as our spill trays to provide a reliable alarming.  They come configured how we need them, simple to install.

Phillip Llamas

Scientific Plastics Inc.



Thank you for the quick work on modifying our level controller, your excellent input, help, and suggestions, and of course, the great product. It’s well built, easy to install, and working flawlessly.

Regards, Chip Warren
Maintenance Manager

Power Engineering and Manufacturing Ltd.

Chip Warren

Power Engineering & Manufacturing Inc.

Order Here



Power Source



Power Input


Circular Connector

This connector makes it easy to disconnect the cable, and Also makes it easy to snake through tight places when installing. Max. dia. 21.7 mm.
[CN-2]   $46.00

Extra cable

Extra cable length over the standard length of 10 feet that’s included. Heavy 0.032″ jacket for superior durability. Four stranded conductors x 24 gage.
[C4] $1.28/ft

Float Switch Level ProbeFloat Switch Level Probe – Polypropylene

Float rigid polypropene pipe mounted with 1 inch NPT cord grip. Attaches to the supplied 10ft cable. link to level probe page

Working Depth
Float Orientation

International Power

The electronics are automatically ready to accept voltages up to 240VAC. All that is needed to run from voltages other than 120VAC, is the right plug.  Choose from the plug adapters below according to your needs.



Buzzer Volume Control

Sometimes our buzzers are too loud.  Snap-on “muffler” reduces the volume by 20 db and anywhere in between just by rotating the slots. [V-1]     $6

Different Buzzer Tones

Different buzzer tones to audibly identify different units. Hear the different tone types here. [BZ-xx]     $18  

Tone Type