Specification

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Venting
On Barometric Draft Controls and draft hoods to
detect flue gas spillage and deactivate oil and
gas burners.
When to use a Thermal Safety Switch
The Thermal Safety Switch detects the increased heat
generated by the flue gas spillage and deactivates the
furnace or boiler. It will not allow the burner to restart
until the switch has been manually reset.
How Thermal Safety Switches Work
NOTE: SPST = Single Pole Single Throw, SPDT = Single Pole Double Throw
Thermal Safety Switches
Model
Field
Part No.
Contact
Material
Load-Rating
Normally Closed
Switch
Switch
Type
Application
AMP
Volts
Opens
Closes
FTS-4
01170004 Silver
12
6
120 AC
240 AC
140°F
Manual
Reset
SPST
Draft Control or Draft Hood mounting Manual
reset. Quicker response time than FTS-6.
FTS-6
01170006 Silver
12
6
120 AC
240 AC
180°F
Manual
Reset
SPST
Draft Control or Draft Hood mounting Manual
reset. For use on 24/120/240 Volt conversion
burner equipment over 400,000 BTU/hr.
GSK-160A
46086403 Silver
-
24 VA
120AC 160°F
Automatic
Reset
SPST
Draft induced furnaces.
Activates at 160°. Auto reset.
GSK-250M
46086404 Silver
-
24 VA
Millivolt
24 AC
250°F
Manual
Reset
SPST
Steam Boilers. Activates at 250°.
Manual Reset.
GSK-3
46086400 Gold
-
24 VA
Millivolt
24 AC
180°F
Manual
Reset
SPST
Standard Gold Contact Manual Reset Switch.
For gas-fired millivolt or 24 VAC application.
GSK-4
46086402 Gold
-
24 VA
Millivolt
24 AC
200°F
Manual
Reset
SPST
Manual Reset Switch, same as GSK-3.
Where slower response time is a requirement.
SSK-1
46111501 Gold
-
24 VA
Millivolt
24 AC
180°F
Manual
Reset
SPST
Kit includes (2) GSK-3 switches (1) 6 ft. length
of 12 GA wire and Switch Jumper Wire.
SSK-3
46111503 Gold
-
24 VA
Millivolt
24 AC
200°F
Manual
Reset
SPST
Kit same as SSK-2 Kit, except switches not
enclosed in electrical box.
TCA-1
46082700 - - - - - -
Required adapter for operation of Gold
Contact Thermal Safety Switches with 30
millivolt systems (residential water heaters).
LS-140A
46564100 Silver 15 120 AC 140°F
Automatic
Reset
SPDT
For plastic vent applications. Recommended
for LP and Natural gas fired power vented and
natural draft water heaters.
LS-550A
46564200 Silver 15 120 AC 550°F
Automatic
Reset
SPDT
For B-Vent applications. Recommended for
LP and Natural gas fired power vented and
natural draft water heaters.
WMO-1
46086900 Silver 10 120 AC 200°F
Manual
Reset
SPST
Manual reset. Designed for use with power
venting and chimney vented systems for oil-
fired applications.
Thermal Safety Switches