SC-40C

Modular Snow/Ice Heater Control System

Features & Benefits

  • Modular power control of automatic snow melting systems
  • No system size limit
  • Staged heater operation for high power quality
  • Energy management computer (EMC) interface
  • Accommodates MI, constant wattage and self-limiting heaters
  • Advanced patented and patent pending ground fault protection
  • Heater hold-on and test capability
  • C-UL-US
  • Simple to install and operate
  • Low energy costs
  • Minimum energy costs
Snow Switch model SC-40C snow and ice melting satellite contactor

Snow Switch model SC-40C snow and ice melting satellite contactor

SC-40C Dimensional Drawing

SC-40C Dimensional Drawing

Description

SC-40C Datasheet  C Series Manual Snow and Ice Sensor Datasheet

The SC–40C Satellite Contactor answers the need for cost effective modular snow melting heater control. One or more SC–40Cs, when used with an APS–4C Control Panel acting as the master control, allow for modular snow melting system design. There is no limit to the number of SC–40Cs that can be interfaced in a single system. This approach reduces front end design, hardware and installation costs while providing a number of useful features that would be otherwise too expensive and complex to implement.

The SC–40C provides the same advanced patented and patent pending Ground Fault Equipment Protection (GFEP) as required by the USA and Canadian National Electric codes that is found on the APS–4C. Upon sensing a ground fault condition, an SC–40C inhibits operation of its contactor until manually reset. Circuits without a ground fault continue to operate normally thus partitioning defective heaters.

The adjustable hold-on timer continues heater operation on each SC–40C for up to 10 hours after snow stops to ensure complete melting and to compensate for differences between zones. The optional RCU–4 Remote Control Unit can be located where system operation can be conveniently observed. It duplicates many of the controls and indicators on the SC–40C front panel.

Each SC–40C provides a complete energy management computer (EMC) interface. This feature provides remote access for advanced applications requiring remote or zone control along with remote annunciation.

Each SC–40C maintains communications to and from the APS–4C using a 3-wire cable. Thus, the APS–4C alarms ground faults occurring anywhere in the system. This feature inserts a short time delay between the operation of each contactor thus improving power quality by limiting the inrush current. The RCU–4 Remote Control Unit supplied permits overriding zone control in applications requiring the capability.

The SC–40C is interchangeable with the earlier SC–40.

Specifications

General
Area of use Nonhazardous locations
Approvals
Enclosure
Protection NEMA 3R
Cover attachment Hinged polycarbonate cover, lockable
Entries 1 × 1-1/16″ entry (top) for NEC Class 2 connections
2 × 1-11/16″ entries (bottom) for supply and load power, except 277 VAC single phase
2 × 1-1/16″ entries (bottom) for supply and load power, 277 VAC single phase only
Material Polycarbonate
Mounting Wall mounted
Communications Bus
Number of cascaded units Unlimited
Contactor delay 5 second
Bus-wire type 3-wire jacketed cable
Circuit type NEC Class 2
Lead length Up to 500′ (152m) using 18 AWG 3-wire jacketed cable
Up to 1,000′ (504m) using 12 AWG 3-wire jacketed cable
Control
Supply ETI PN 22477: 208-240 VAC, 35 VA, 3-phase 50/60 Hz
ETI PN 22478: 277 VAC, 45 VA, single phase 50/60 Hz
ETI PN 22480: 277/480 VAC, 45 VA, 3-phase 50/60 Hz
ETI PN 22481: 600 VAC, 50 VA, 3-phase 50/60 Hz
Load ETI PN 22477: 208-240 VAC, 50 amp max. resistive
ETI PN 22478: 277 VAC, 40 amp max. resistive
ETI PN 22480: 277/480 VAC, 50 amp max. resistive
ETI PN 22481: 600 VAC, 50 amp max. resistive
Contact type 3 Form A
Maximum Ratings Voltage: 600 VAC
Current: 50 amps
Heater hold-on timer 0 to 10 hours; actuated by toggle switch
System test Switch toggles the heater contact on and off. If temperature exceeds high limit, heater cycles to prevent damage.
Ground Fault Equipment Protection (GFEP)
Set point 30 mA (default); 60 mA and 120 mA selectable by DIP switch
Automatic self-test Mode A: Verifies GFEP function before contactors operate
Mode B: Verifies GFEP and heaters every 24 hours
Manual test/reset Toggle switch provided for this function
Maintenance facility DC output proportional to ground current provided for troubleshooting the heater system
Snow/Ice Sensors
Not Applicable
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
Inputs OVERRIDE ON (10 ma dry switch contact)
OVERRIDE OFF (10 ma dry switch contact)
Outputs 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)
Environmental
Operating temperature −40°F to 160°F (−40°C to 71°C)
Storage temperature −50°F to 180°F (−45°C to 82°C)

ORDERING INFORMATION

Order Number Description
22477 SC–40 Satellite Contactor, 208-240 VAC 50/60 Hz Three Phase
22478 SC–40 Satellite Contactor, 277 VAC 50/60 Hz Single Phase
22480 SC–40 Satellite Contactor, 277/480 VAC 50/60 Hz Three Phase
22481 SC–40 Satellite Contactor, 600 VAC 50/60 Hz Three Phase
Accessories
21358 RCU–4 Remote Control (Optional)
19272 High Temperature Sensor w/ 20′ (6m) lead (Qty 1 included)
22690 PTS–100 Embedded Temperature Sensor (Optional)
Snow/Ice Sensors (Not Included)
10001 CIT–1 Aerial Snow Sensor
11351 GIT–1 Gutter Ice Sensor
20756 SIT–6E Pavement Mounted Snow/Ice Sensor
Satellite Contactors (Not Included)
22472 APS–4C Control Panel, 208-240 VAC 50/60 Hz Three Phase
22473 APS–4C Control Panel, 277 VAC 50/60 Hz Single Phase
22475 APS–4C Control Panel, 277/480 VAC 50/60 Hz Three Phase
22476 APS–4C Control Panel, 600 VAC 50/60 Hz Three Phase