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You searched for: ETI Tracon SST-3 Adjustable Pipe Freeze Protection Set Point Electronic Thermostat with Ground Fault Equipment Protection
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ETI Tracon SST-3 Adjustable Set Point Electronic Thermostat with Ground Fault Equipment Protection


The Tracon model SST–3 adjustable set point thermostat provides process temperature maintenance in cost-sensitive applications requiring ground fault equipment protection (GFEP). The SST–3 adjustable set point thermostat protects processes and equipment from damaging temperatures and/or viscosities by maintaining an adjustable temperature set point from 34°F to 150°F (1°C to 65°C). Typical applications include freeze protection, hot water temperature maintenance, and flow assurance/viscosity maintenance.

The SST–3 adjustable set point thermostat operates heaters at temperatures below the configured set point, and turns them off when the temperature rises 2°F (1°C) above the set point. The adjustable temperature set point is configured via the front panel. The external temperature sensor (supplied) is a NEC Class 2 device rated for wet locations.

The SST–3 adjustable set point thermostat features a built-in 30 mA GFEP, digitally filtered to minimize false tripping. A ground fault must be manually reset with the TEST/RESET switch before heater operation can be resumed. The GFEP function is automatically tested along with the heaters whenever power is applied and once every 24 hours thereafter for additional safety. An optional operational mode allows the GFEP to alarm without disabling heater operation for use with critical fire protection systems.
The SST–3 adjustable set point thermostat includes an alarm relay with an isolated SPDT 1 AMP contact. The alarm relay is reverse acting and is normally energized unless there is a ground fault condition, GFEP circuitry fails a test, when there is a bad temperature sensor, or when there is a low limit temperature condition.

The SST–3 adjustable set point thermostat operates from automatically selected operating voltages from 200 to 277 volts, single-phase. It controls heater loads of up to 30 amps. The temperature sensor is an NEC Class 2 device that can be located up to 2,000' (610m) away from the thermostat.



Area of use
Nonhazardous locations

C-UL-US Listed, Type 873 Temperature Regulating Equipment & Type 1053 Ground-Fault Sensing and Relaying Equipment



Cover attachment
Polycarbonate cover, machine screws

1 × 3/4" entry (bottom right) for NEC Class 2 connections
3 × 1-1/16" entries (bottom left and left) for supply and load power


Wall mounted

Front Panel Interface
Status indicator
SUPPLY (green) power applied
SUPPLY (green, flashing) bad thermistor
HEAT (yellow) call for heat
GFEP (red) ground fault condition
GFEP (red, flashing) failed GFEP test
GFEP (red, flashing, rapid) GFEP test in progress

Remote Interface

Alarm relay
Isolated SPDT 1 AMP Class 2 contact

Summary alarms
No Power
Ground Fault Condition
GFEP function test failure
Bad or missing Thermistor


Supply voltage
208, 240 or 277 volts, single phase (automatically selected)

Contact type
Two Form A DPST

Maximum ratings
Voltage: 277 VAC
Current: 30 amps

Temperature Sensor

Set point
34°F - 150°F (1°C - 65°C)

Dead band
2°F (1°C)

Sensor type
Thermistor network

Circuit type
NEC Class 2

Lead length
Up to 2,000' (610m) using 12 AWG 2-wire jacketed cable
Up to 500' (152m) using 18 AWG 2-wire jacketed cable

Ground Fault Equipment Protection (GFEP)

Set point
30 mA

Automatic self test
Mode A: Verifies GFEP function before contactors operate
Mode B: Verifies GFEP function every 24 hours

Manual test/reset
TEST/RESET switch of front panel


Operating temperature
Enclosure: -40°F to 130°F (-40°C to 55°C)
Temperature Sensor: -40° to 300°F (-40° to 149°C)

Storage temperature
-67°F to 167°F (-55°C to 75°C)

Installation Instructions
Data Sheet
Installation Manual
Item CodeDescriptionVendorQuantity
19272 Temperature Sensor
ETI (Environmental Technology Inc.) Ambient High Temperature Sensor with 20 Foot Lead for use with SST-3
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25076 Temperature Sensor
ETI (Environmental Technology Inc.) Ambient High Temperature Sensor with 20 Foot Lead for use with SST-2, EUR-5A, APS-4C, SC-40C, APS-3C & GPT-3. Unpolarized wiring.