Viking Electronics LDB3
Viking Electronics LDB3

Viking Electronics LDB3 Loop/Ring Detect Brd F/Rng/Line "In Use"

Manufacturer Name & URL:

Viking Electronics, Inc website is SKU:  VEN11-VIK-LDB3
Manufacturer:  Viking Electronics
Manufacturer Part Number:  LDB3
Model Number:  LDB3
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Viking Electronics LDB3
Your Price:54.79


Out of stock

UPC / GTIN-12:


EAN / GTIN-13:

Brief Product Description:

Loop/Ring Detect Brd F/Rng/Line "In Use"



The LDB-3 Advanced Loop Detector monitors an analog phone line for ringing or an off hook condition. A built-in relay can be activated when either of these conditions are detected. This is ideal for monitoring line status or for providing a visual indication of such.

The LDB-3's disable input is ideal for two-button emergency phones, such as Viking's E-1600-20A, allowing "Info" button calls to be placed without activating the relay (turning on the emergency strobe light, camera, etc.)

Three DIP switches are provided for turning ring detection on or off, off-hook loop detection on or off and for selecting a ring cadence mode which allows the relay to follow ringing or to remain activated during the off time of standard ring cadence.


  • Detects ring voltage and off hook loop current
  • On/off switches for ring detection and off hook/loop detection
  • Screw terminal connections
  • Selectable ring cadence mode (relay can remain on between rings)
  • Wall mountable with foam tape (included) or screws (not included)
  • Switched 12V DC output (follows relay activation for powering strobe lights, cameras, etc.)
  • One set of (NO) normally open and (NC) normally closed relay contacts provided
  • Disable input, ideal for use with two-button emergency phones (E-1600-20A), will not activate relay on "Info" calls
  • Made in the USA
  • 1 Year Warranty


Control a strobe or beacon light for ring indication
Provide relay closures on off-hook
Trigger a security camera
Trigger a tape recorder
Phone "In Use" indicator


  • Power: 120V AC to 12V DC adapter provided
  • Dimensions: 74mm x 53mm x 25mm (2.9" x 2.1" x 1.0")
  • Shipping Weight: 0.4 kg (0.86 lbs)
  • Environmental: -26 C to 54 C (-15 F to 130 F) with 5% to 95% non-condensing humidity
  • Relay Contact Rating: .5A @ 125V AC/1A @ 30V DC
  • Maximum Current Draw Auxiliary 12V DC Output: 350mA
  • Minimum Loop Current: 15 mA
  • Disable/Info Switch Input: 50mA/80mW maximum
  • Ringer Equivalence: 0.5 A REN
  • Connections: 10 pin screw terminal block

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