Advanced Loop Detector

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Price: $79.95
Part #: LDB3
Manufacturer: Viking Electronics
Mfr Part #: LDB3
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


  • 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")
Environmental: -26 degC to 54 degC (-15 degF to 130 degF) 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