SR Products ETL69C-40 Nominal Temperature Rating - Manual (Page 3)

Doc. ETL69C-40-I
9-30-2009
Rev. A
Page 3 of 6
half) it is recommended to allow the link to “float” using “S” hooks, straps or other
attachments.
ELECTRICAL CHARACTERISTICS
The ETL69C-40 is rated 24 VDC, 200mA. It contains a bridge wire initiated
pyrotechnic heating element. The 14u bridge wire has a nominal resistance of 10 to
30 Ohms. The bridge wire serves as the ignition source for the chemical heater core.
The design of the bridge wire has been optimized, requiring minimal energy to
function while remaining safe to handle, transport and install.
Care should be exercised in handling and installing the ETL69C-40 with particular
attention to the following electrical characteristics: Avoid proximity to electrostatic
discharge or heavy induction fields. Keep the lead wires twisted or otherwise
shunted unless performing resistance checks or until making final connection. Keep
the ETL69C-40 inside the packaging box when not in use, or wrap it in aluminum
foil to protect it from unwanted accidental exposure to stray current such as radio
transmission fields; electric motor induction fields; electrical coils, and static
discharge.
The ETL69C-40 Link integrates a relay that isolates the bridge wire in the thermal
element. When an alarm system “end of the line” device is wired to the link input
and the link and is terminated to a Listed UL 864 Fire Alarm Control unit
compatible with this device the wiring should be supervised. When wired, the
listed control unit continuously monitors the link circuit, per the wiring diagram.
Even minimal continuous input current through the bridge wire will cause long term
“baking” of the internal chemical core, and allow ingress for an undesired current at
levels sufficient to cause unwanted actuation of the device.