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You searched for: ETI Snow Switch Model GF Pro. Automatic Snow & Ice Melting System Control with Integral Ground Fault Equipment Protection
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ETI Snow Switch Model GF Pro. Automatic Snow & Ice Melting System Control with Integral Ground Fault Equipment Protection


Snow Melting Systems Control: Automatic with Integral Ground Fault Equipment Protection

Snow melting systems control: Automatic, GFEP

The Snow Switch® Model GF Pro utilizes standard Environmental Technology snow and ice sensors (sold separately), applications include snow and ice detection and melting for pavement, sidewalks, loading docks, roofs, gutters and downspouts in commercial and residential environments.

The GF Pro interfaces with up to two standard Environmental Technology sensors to meet site requirements. The CIT–1 sensor may be roof or mast mounted and can be paired with the GIT–1 sensor for gutter applications or the SIT–6E sensor for pavement applications. All three sensors detect precipitation as snow at temperatures below 38°F (3.3°C), saving energy and ensuring thorough snow and ice melting. Since 1968, these sensors have been the industry’s most versatile and cost-effective automatic snow melting control sensors.

The GF Pro features built-in 30mA, self-testing Ground Fault Equipment Protection (GFEP), digitally filtered to minimize false tripping. A ground fault condition must be manually reset using the Test/Reset switch before heater operation can continue.

The GF Pro uses both automatic and manual-override operator controls. The adjustable Hold-On timer continues heater operations up to 8 hours after snow or ice conditions end to ensure complete melting. The Heater Cycle control button allows manual initiation or cancellation of a heating cycle. The optional RCU–4 remote control unit can be located for convenient monitoring and control. These flexible control options provide complete snow melting and water evaporation at a low operating cost.

The GF Pro weighs only 3 pounds and measures 5 1/2” (L) x 8 1/8” (W) x 4 3/8” (H). Comprehensive instruction manuals simplify installation and operation. These products are also supported by Environmental Technology Technical Support.

The GF Pro is a capable snow and ice control for medium-sized applications whose features and power requirements do not require an APS or EUR Series control panel.



Area of use
Nonhazardous locations

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


IP 66, NEMA 4X

Cover attachment
Polycarbonate with machine screws

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


Wall mount

5 1/2" (L) x 8 1/8" (W) x 4 3/8" (H) / 140mm (L) x 207mm (W) x 112mm (H)


Supply voltage
200 - 277 VAC; 50/60 Hz

30 amp maximum resistive

Contact type
2 Form A

3 Pounds (not including sensors)

Maximum ratings
Voltage: 277 VAC
Current: 30 amps

Heater Hold-On timer
0 to 8 hours; actuated by snow stopping or toggle switch

System test
Switch toggles heater contact on and off. If temperature exceeds optional high limit thermistor (45°F), heater shuts off to reduce costs and prevent damage.

Front Panel Interface

Status indicator
SUPPLY (green): Power on
HEAT (yellow): Heating cycle in progress
SNOW (yellow): Sensor(s) detect snow
GFEP (red): Ground Fault condition
GFEP (red, flashing): Failed
GFEP (red, rapid flashing): GFEP test in progress

Snow/Ice Sensors

Maximum quantity
2 ETI sensors

Circuit type
NEC Class 2

Lead length
Up to 500' (152m) using 18 AWG 3-wire jacketed cable
Up to 2,000' (609m) using 12 AWG 3-wire jacketed cable

Wire and Cable Ratings

Power cable
Size for heater load (30 amps maximum)

Sensor wiring
#18 AWG jacketed, 3-conductor

Heater cable
Size for maximum heater load

Remote wiring
#22 AWG jacketed, 2-conductor

Ground Fault Equipment Protection (GFEP)

Set point

Automatic self-test
GFEP verified before contactors operate; GFEP runs on start-up and every 24 hours

Manual Test/Reset
Test/Reset switch on front panel


Operating temperature
-31°F to 130°F (-35°C to 55°C)

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

Installation Instructions
Data Sheet
Installation and Operation Instructions
Item CodeDescriptionVendorQuantity
GF PRO Snow & Ice Control
ETI (Environmental Technology Inc.) Snow Switch. Automatic Snow & Ice Melting System Control with Integral Ground Fault Equipment Protection, 200-277 VAC, U-L /CSA