M-949-11 Datasheet, PDF (1/3 Pages) Clare, Inc. – Line Sense Relay

Features
• Meets UL and British Standard specifications
• Designed for use with FCC Part 68 certified
equipment
• Temperature ranges from -25º to 70ºC
• Senses telephone line current from 15 to 200 mA
• Includes a 1-Form-A relay contact
• Achieves excellent longitudinal balance
• Meets high-voltage isolation requirements up to
4,000 volts
• Filters common-mode noise through dual coils
Applications
• Telephone Exchange Products
• PBX and Key Systems
• Station Message Detail Reporting (SMDR)
Systems
Figure 1. Electrical Configuration
M-949-11
Line Sense Relay
Description
The M-949-11 Line Sense Relay is a small, PCB-
mounted loop current detector with the safety and
reliability features required for UL and British Standard
(BSI) regulated telephone applications.
The M-949-11 is designed for both North American
and international use, and offers superior protection
against voltage surges such as lightning strikes.
When connected to the voice pair (tip and ring) of an
ordinary telephone line, the M-949-11 provides a
1-Form-A relay closure in response to current flowing
through the wires. This closure can be used with
control circuitry for on-hook/off-hook monitoring, switch
hook flash detection, and rotary dial pulse counting.
The M-949-11 is ideally suited for use with the Teltone
M-959 Dial Pulse Counter and other loop-current
applications, including microprocessor-based designs.
Ordering Information
Part #
M-949-11
Description
Loop Current Sensing Relay
Figure 2. Typical Application: Dialed Digit Monitor
DS-M-949-11-R02
www.clare.com
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