Product Overview
Square D Class 8502 Type SEO 1 NEMA Size 3 2-Pole Contactor 240V Coil
Condition
Unused new old stock (NOS). Stored as an unused spare. Box lugs and terminal hardware show clean plating with intact factory jumper wiring. Markings legible: CLASS 8502 TYPE SEO 1 SERIES A 297378 BD, with coil markings 31074-400-47.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Engineered for high-power single-phase motor switching and circuit control, Square D Class 8502 Type SEO 1 is a heavy-duty NEMA Size 3 open-style AC magnetic contactor. Stamped under Series A and catalog code 297378 BD, this two-pole assembly handles continuous line currents up to 90 amperes at up to 600 VAC. The contactor is fitted with an operating coil (part number 31074-400-47) rated for 240 VAC at 60 Hz and 220 VAC at 50 Hz, connecting line terminals 1&L1 and L2 to load terminals T1 and T2 through heavy-duty mechanical box lugs.
Key Features
- Class 8502 Type SEO 1 Series A open-style industrial contactor
- NEMA Size 3 frame rated for 90 A continuous current at up to 600 VAC max
- Two-pole construction configured for single-phase motor control
- Single-phase motor rating: 7.5 HP at 115 VAC, 15 HP at 230 VAC
- Square D coil part number 31074-400-47 rated for 240V 60Hz and 220V 50Hz
- Heavy-duty mechanical screw box lugs for line (1&L1, L2) and load (T1, T2) connections
- Sturdy stamped steel backplate with slotted mounting keyholes
Applications
- Switching high-power single-phase industrial equipment such as air compressors, hydraulic power units, and high-volume ventilation fans.
- Upgrading or rebuilding legacy motor control centers and custom automation panels requiring rugged NEMA-rated gear.
- Farm, irrigation, and deep-well pump starter panels managing heavy inductive startup loads.
- Workshop and maker power-distribution setups running large 230V phase converters, metal lathes, or vintage woodworking machinery.
Frequently Asked Questions
What are the single-phase motor ratings for this contactor?
The nameplate specifies single-phase ratings of 7.5 HP at 115 VAC and 15 HP at 230 VAC, with a maximum line voltage rating of 600 VAC and 90 A continuous duty.
What operating voltage does the magnetic coil require?
The installed coil (Square D part number 31074-400-47) is rated for 240V AC at 60 Hz and 220V AC at 50 Hz control circuits.
Does this Class 8502 contactor include an integrated overload relay?
This is an open-style contactor (Class 8502) designed strictly for power switching. It does not include an overload relay block; thermal motor overload protection must be provided separately in the circuit.
When a fifteen-horsepower motor needs to wake up, you don't send a lightweight relay to do the job. Bolt this Size 3 unit to the backplate, wire the coil, and listen for that solid industrial clunk.
