SR Products ETL69C-40 Nominal Temperature Rating User Manual
Page 2
Doc. ETL69C-40-I
9-30-2009
Rev. A
Page 2 of 6
TECHNICAL DESCRIPTION
The ETL69C-40 is a UL listed fusible link / release device with a 69°C (156°F )
nominal temperature rating and a 5 - 40 pound (2.267 - 18 KG) continuous –
continuous tensile End pull weight rating at standard temperature.
It contains a bridge wire initiated pyrotechnic heating element requiring a 50
millisecond minimum duration all fire current of 200 mill amperes (0.2 ampere)
within a voltage range of 24 VDC (NEC Class 2, low voltage).
In addition, the link has additional circuits that allow an Alarm System listed under
UL 864 9
th
Edition to supervise (monitor) the product for broken wire, shorts or
grounds in the wires feeding the power to this product.
The fusible link portion is a nominal 1” (25.4 mm) X 3 1/8 (79.4 mm) X ½” (12.7
mm) envelope with ½” (12.7mm) square reinforced openings at the ends to allow
attachment of “S” hooks, straps, or other attachments.
A perforated two piece electrical enclosure houses an 11/16” (17.3 mm) diameter x
1 ¼” (31.7 mm) protruding cylinder containing the pyrotechnic heating element
and attachment wires (UL 1018 Wire Class 1). It provides a means to attach a
standard EMT conduit connector adapter to 3/8” (9.5 mm) or ½” (12.7 mm)
flexible conduit, thereby meeting any requirements such as National Electric Code
specifications for ‘Wiring in Ducts, Plenums, and Other Air Handling Spaces.’
The ETL69C-40 has a 40 lbs. maximum continuous tensile strength at standard
temperature which can only be achieved in installations where the link is subject to
equal linear tension from both ends. If radial, side or “peel” forces are encountered
(which is typical in most smoke damper installations) the weight may have to be
reduced, or the force vectors re-established. For this reason it is not permissible to
bolt or fix one end of the ETL69C-40 in most installations. Even if the installation
is gravity release (i.e. forty pounds hanging straight down from the bottom link