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Line Sense Relay

This Line Sense Relay addresses telephony hook switch monitoring and rotary dial pulse counting while addressing regulatory needs.

M-949-11 Balanced Dual Coil Telephone Line Current Sensing Relay

  • Senses telephone line current from 15mA to 200mA
  • Used by control circuitry for on-hook/off-hook monitoring, switch hook flash detection and rotary dial pulse
  • Meets high isolation voltage requirement of 4000V
  • Meets UL and British Standard specifications
  • Includes 1 Form A relay contact

M-949-11 R4 Data Sheet

AN-142: M-949 - Loop Current Sensing and Ring Chatter

Block Diagram
M-949-11 Block Diagram

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