Product Overview
Class 8502 Type SDG 2 Series A 600V AC Motor Starter Switching Unit
Condition
Used. Evaluation: Visual inspection only. Function testing not performed. Markings legible: SQUARE D COMPANY NEMA SIZE 2 CLASS 8502 TYPE SDG 2 FORM S SERIES A 600V MAX, with coil marked 31063-409-38 120V 60HZ / 110V 50HZ. Mechanical screw lugs installed on line and load sides. Surface scuffs, dust, and handwritten white ink notations on rear terminal barriers consistent with prior equipment installation.
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Product Overview
Square D Class 8502 Type SDG2 Series A is an open-style, panel-mount NEMA Size 2 AC magnetic contactor engineered for heavy-duty three-phase motor starting and power switching up to 600 VAC. Built with a continuous current rating of 45 amperes, this 3-pole contactor handles induction motor loads up to 10 horsepower at 200 VAC, 15 horsepower at 230 VAC, and 25 horsepower across 380, 460, and 575 VAC systems. It comes equipped with a Square D 31063-409-38 operating coil wound for standard 120 VAC 60 Hz and 110 VAC 50 Hz control circuits.
Key Features
- NEMA Size 2 rated 3-pole AC magnetic contactor for motor starting and industrial load control
- Continuous ampacity rating of 45 A up to 600 VAC maximum
- Three-phase motor ratings: 10 HP at 200 VAC, 15 HP at 230 VAC, 25 HP at 380/460/575 VAC
- Square D 31063-409-38 operating coil rated 120V 60Hz / 110V 50Hz
- Form S design suited for separate control circuits
- Heavy-duty mechanical screw clamp power lugs on line (1&L1, L2, L3) and load (T1, T2, T3)
- Zinc-plated steel baseplate with multi-hole pattern for standard backpan installation
Applications
- Drops straight into existing industrial motor control center (MCC) buckets or custom enclosures replacing a worn Size 2 contactor
- Serves as the main power staging contactor on industrial air compressors, pump skids, and dust collection blowers
- Controls heavy three-phase resistive heating banks or machine tool spindle drives requiring robust 120V control isolation
- Acts as a heavy-duty power isolation contactor for shop machinery conversions and phase converter builds
Frequently Asked Questions
Does this contactor include an overload relay block?
Not included. This is an open Class 8502 Type SDG2 contactor unit without integrated thermal or bimetallic overload blocks.
Can the coil be swapped for a different control voltage?
The magnet coil assembly is field-replaceable on Square D Type S contactors. This unit currently carries a 110/120 VAC coil (part number 31063-409-38).
What should I inspect on this contactor prior to installation?
Because this is a used pull, visually inspect contact face wear by loosening the upper corner screws to check the contact tips, and verify coil resistance and control circuit wiring before energizing.
Square D Type S hardware earned its place inside plant control cabinets decades ago by doing heavy electrical work without drama. Drop this Size 2 into your enclosure and put your motor back in service.
