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You searched for: ETI Snow Switch Model APS-3C. Automatic Snow/Ice Melting System Control
Results Displayed: 1 - 4 of 4

ETI Snow Switch Model APS-3C. Automatic Snow/Ice Melting System Control


The APS–3C Snow Switch when used with compatible sensors automatically controls snow/ice melting heaters, ensuring minimum operating costs. Typical applications include pavement, sidewalk, loading dock, roof, gutter and down spout snow/ice melting. The APS–3C is interchangeable with earlier APS–3 models.

The adjustable hold-on timer continues heater operation for up to 10 hours after snow stops to ensure complete melting. The optional RCU–3 Remote Control Unit can be located where system operation can be conveniently observed. It duplicates many of the controls and indicators on the APS–3C front panel. It is used to clear tracked and drifting snow that may not land on a sensor.

The calibrated 40°F to 90°F (4°C to 32°C) high limit thermostat prevents excessive temperatures when using constant wattage and MI heaters. It also permits safe testing at outdoor temperatures too high for continuous heater operation. The temperature sensor is included.

The APS–3C provides a relay closure interface for use with energy management computers (EMC). This feature can also be used for general purpose remote control and annunciation and other advanced applications.

All sensor and communications wiring is NEC Class 2. This simplifies installation while enhancing fire and shock safety. The APS–3C can interface up to six sensors from the CIT–1 product family. More sensors provides superior performance by better matching the controller to site performance requirements.



Area of use
Nonhazardous locations




Cover attachment
Hinged polycarbonate cover, lockable

3 × 1-1/16" entries


Wall mounted


ETI PN 22470: 120 VAC, 50/60 Hz, 35 VA
ETI PN 22471: 208-240 VAC, 50/60 Hz, 35 VA

ETI PN 22470: 120 VAC, 24 amp max. inductive
ETI PN 22471: 240 VAC, 24 amp max. inductive

Contact type
Form C

Maximum Ratings
Voltage: 240 VAC
Current: 24 amps

Heater hold-on timer
0 to 10 hours; actuated by snow stopping or toggle switch

System test
Switch toggles the heater contact on and off. If temperature exceeds high limit, heater cycles to prevent damage.

Snow/Ice Sensors

Sensor type
Up to 6 sensor from the CIT–1 product family

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

High Limit Thermostat

Adjustment range
40°F to 90°F (4°C to 32°C)

Dead band
1°F (0.6°C)

Sensor type
Thermistor network

Circuit type
NEC Class 2

Lead length
Up to 500' (152m) using 18 AWG 2-wire jacketed cable
Up to 1,000' (504m) using 12 AWG 2-wire jacketed cable

Energy Management Computer (EMC) Interface

OVERRIDE ON (10 ma dry switch contact)
OVERRIDE OFF (10 ma dry switch contact)

SUPPLY (10 ma dry switch contact)
SNOW (10 ma dry switch contact)
HEAT (10 ma dry switch contact)
HIGH TEMP (10 ma dry switch contact)
ALARM (10 ma dry switch contact)


Operating temperature
-40°F to 160°F (-40°C to 71°C)

Storage temperature
-50°F to 180°F (-45°C to 82°C)

Installation Instructions
Data Sheet
Item CodeDescriptionVendorQuantity
19272 Temperature Sensor
ETI (Environmental Technology Inc.) Ambient High Temperature Sensor with 20 Foot Lead for use with SST-2, SST-3, EUR-5A, APS-4C, SC-40C, APS-3C & GPT-3
RCU-3 Remote Control Unit
ETI (Environmental Technology Inc.) Flush or surface mount remote control & indication of Snow/Ice Melting Controllers (for use w/ PD Pro, RS Pro, APS-3C or EUR-5A)
APS-3C 120V Snow Melting Control
ETI (Environmental Technology Inc.) Snow Switch. Automatic Snow/Ice Melting System Control, 120 VAC Single Phase, UL / CSA
APS-3C 208/240V Snow Melting Control
ETI (Environmental Technology Inc.) Snow Switch. Automatic Snow/Ice Melting System Control, 208-240 VAC Single Phase, U-L / CSA