The 3500‑3271 Disconnect Assembly, also identified as Nordyne 621030, is a genuine OEM electrical disconnect block used in Coleman, Nordyne, Intertherm, and Miller electric furnaces. Designed for high‑amperage electric heat systems, this assembly provides a safe method for disconnecting power during servicing and maintenance.

Featuring a four‑pole 60‑amp configuration (60A‑60A‑60A‑60A), this disconnect block is commonly used in electric furnace heater packages where multiple heating circuits require secure power isolation. Built to OEM specifications, it ensures reliable electrical connections and proper current handling for electric heating elements and furnace controls.

Ideal for replacing worn, overheated, damaged, or missing disconnect assemblies in manufactured housing and residential electric furnace applications.

 Cross‑Reference (Technician Binder Card Format)

Direct OEM

• 3500‑3271 — Coleman Disconnect Assembly
• 621030 — Nordyne Disconnect Assembly

Compatible Brands

• Coleman
• Nordyne
• Intertherm
• Miller
• Broan
• Frigidaire
• Maytag
• Tappan
• Gibson

Specifications

• Amperage Rating: 60A × 4 Poles
• Configuration: 60A‑60A‑60A‑60A
• Application: Electric Furnace Disconnect Block
• Type: Pull‑Out Disconnect Assembly
• OEM Replacement: Yes

Common Applications

• E1 Series Electric Furnaces
• E2 Series Electric Furnaces
• E3 Series Electric Furnaces
• E4 Series Electric Furnaces
• FEH Series Electric Furnaces
• Other Nordyne electric furnace heater packages

 Technician Notes

• Provides service disconnect for electric heat packages.
• Designed for multiple heating element circuits.
• Inspect terminals for signs of overheating during replacement.
• Verify wire torque specifications during installation.
• Replace if disconnect shows:
  • Burned contacts
  • Melted housing
  • Loose terminals
  • Evidence of arcing
  • Heat discoloration

Common Symptoms of Failure

• Intermittent electric heat
• Burned terminal connections
• Power loss to heater elements
• Excessive heat at disconnect block
• Visible arcing damage