8502 Type S (NEMA Size 2, 45 A)
Square D (Schneider) · Class 8502 Type S NEMA Size 2
NEMA Size 2 Square D — 45 A continuous, 25 HP @ 460 V. The classic replacement in older two-stage recip and 20–25 HP screw panels.
Ratings
- NEMA size
- 2 (45 A continuous)
- Hp (3Φ)
- 15 HP @ 230 V · 25 HP @ 460/575 V
- Hp (1Φ)
- 3 HP @ 115 V · 7.5 HP @ 230 V
- Single-phase HP
- 3 HP @ 115 V · 7.5 HP @ 230 V
- Three-phase HP
- 15 HP @ 230 V · 25 HP @ 460 V
Coil data
- Available coil voltages
- 24, 120, 208, 240, 277, 480, 600 VAC 60 Hz
- Inrush VA
- ≈ 275 VA
- Sealed (holding) VA
- ≈ 25 VA
- Pickup voltage
- ≈ 85% of rated
- Dropout voltage
- ≈ 40–70% of rated
Typical measured coil resistance (±15%, ballpark)
24 VAC≈ 2–6 Ω
120 VAC≈ 50–110 Ω
240 VAC≈ 200–450 Ω
480 VAC≈ 800–1,700 Ω
OL = open coil · near zero = shorted turns · coil-to-frame must read >1 MΩ.
Coil resistance checker
Pick the coil voltage, enter your meter reading across A1–A2 (coil disconnected), and compare it to the expected ballpark.
Ω
This model (24 VAC table value)2 Ω–6 Ω
Generic mid-frame 24 VAC4 Ω–9 Ω
OL = open coil. 0–2 Ω = shorted turns (often from a cooked transformer). Ballpark only (±15%+); electronic wide-range coils (e.g. ABB AF) read misleading values — test those at rated voltage instead. Always measure coil-to-frame too: must be >1 MΩ.
Terminals & accessories
Power/coil terminals: Line L1–L3 top, load T1–T3 bottom, box lug to 4 AWG
Auxiliary contacts: 1 NO standard; Class 9999 aux decks add NO/NC
Companion overload: Melting-alloy (Class 9065) or bimetal overload block with thermal units sized per table
Cross-references
Field notes
- Field-replaceable contact kits are still available for 8502 Size 2 — often cheaper than a whole starter on an old panel.
- Melting-alloy thermal units are chosen from the Square D table by motor FLA and service factor — do not reuse the old ones on a different motor.
- Blowing dust off the magnet faces and checking for a cracked shading coil fixes most Size 2 buzz complaints.
Manufacturer documentation