Sr-products ETL121375 Nominal Temperature Rating User Manual download pdf

375˚ F ETL® P/N: 121375 ELECTRO THERMAL LINK®

The Electro Thermal Link [ ETL® ] is a multi-purpose, dual responsive fusible link I release device. The

fusible link portion functions identically to an ordinary fusible link - ambient temperature nearing the rated

temperature causes the fusible alloy to melt, allowing the link halves to separate. The ETL® can also be

actuated by an electrical impulse. A 0.2 ampere minimum trip current applied for 50 millisecond minimum

duration starts an irreversible chemical reaction that melts the fusible alloy and causes link separation in 12 to

20 seconds at standard temperature. The ETL® was designed to substantially improve life safety and minimize

property damage by providing both ordinary fusible link response in the event of fire along with the capability to

instantaneously respond to any type of fire, smoke, infrared, light detector (etc.) capable of supplying a short

duration current impulse. The design allows for ETL® substitution or retrofitting of ordinary fusible links and

other actuators or release devices installed in: dampers; doors; roof hatches; towers; extinguishing systems,

and inert chemical or gas release systems. An inherent major advantage of the ETL® over other products is

the dually redundant dormancy – it draws no current and stays inertly in place until actuated, then functions

and separates in seconds. The ETL® is designed and intended FOR INDOOR (or sheltered) DRY USE ONLY.

TECHNICAL DESCRIPTION

The 375º F ETL® is a fusible link / release device with a 375º F (190º C) nominal temperature rating

and a 40 pound maximum continuous - 7 pound minimum continuous tensile weight rating at standard

temperature. Additionally, it contains a bridgewire initiated pyrotechnic heating element requiring a fifty (50)

millisecond minimum duration all fire current of 200 milliamperes (0.2 ampere) within a voltage range of 6-30

VAC/DC (NEC Class 2, low voltage). The fusible link portion is a nominal 1” (25.4 mm) X 3 ⅛ (79.4 mm) X ½”

(12.7mm) envelope with ½” (12.7 mm) square reinforced openings at the ends to allow attachment of “S”

hooks, straps, or other attachments. An 11/16” (17.3mm) diameter x 1 ¼” (31.7mm) protruding cylinder houses

the pyrotechnic heating element and attachment wires (UL® 1018 Wire Class 1) and provides a means to

attach a standard EMT conduit connector adapter to any combination ½” (12.7 mm) EMT; or ⅜” (9.5 mm) or ½”

(12.7mm) flexible conduit. The ETL® has a forty (40) pound 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 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 ETL® in most installations. Even if the Installation is gravity release (i.e. forty pounds

hanging straight down from the bottom link half) it is recommended to allow the link to “float” using “S” hooks,

straps or other attachments.

ETL375F

Rev. D

2/24/12

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Summary of Contents

Page 1

375˚ F ETL® P/N: 121375 ELECTRO THERMAL LINK®The Electro Thermal Link [ ETL® ] is a multi-purpose, dual responsive

Page 2

ELECTRICAL CHARACTERISTICSThe ETL® contains a bridge wire initiated pyrotechnic heating element. The 14μ bridge wire has a nominal resistance of 10 to

Page 3

Installation InstructionsThe ETL® is typically mounted on dampers in ductwork; roof hatches; fire doors, and for other uses where retrofit or replacem

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ETL StorageThe ETL should be stored in indoor or sheltered dry areas where the ambient temperature should not exceed 150F. The ETL should remain in i

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Sr-products ETL121375 Nominal Temperature Rating User Manual

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Summary of Contents

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