Square D 8536 SF01 NEMA Size 4 Motor Starter 600VAC 100HP 120V Coil Form S

Square D 8536 SF01 NEMA Size 4 Motor Starter 600VAC 100HP 120V Coil Form S Series A

The Square D Class 8536 SF01 is a NEMA Size 4 full-voltage electromagnetic motor starter designed for polyphase (three-phase) motor control applications. It uses an electromagnetically operated contactor combined with an overload relay assembly to start, stop, and protect AC induction motors. The coil is rated 120V at 60Hz (110V at 50Hz), making it compatible with standard North American 120V control circuits. The unit is rated for up to 600VAC maximum and is built to NEMA Size 4 standards for higher-horsepower industrial duty.

Specifications & What's Included

• Manufacturer: Square D Company
• Class: 8536
• Type: SF01
• Form: S
• Series: A
• NEMA Size: 4
• Maximum Voltage: 600VAC
• Coil Voltage: 120V / 60Hz (110V / 50Hz)
• Coil Part Number: 31091-400-38
• Part Number: 97212/83323
• Polyphase HP Ratings:
  • 200VAC: 40 HP
  • 230VAC: 50 HP
  • 380VAC: 75 HP
  • 480/575VAC: 100 HP
• Phase: Three Phase (Polyphase)
• Contact Kit: Class 9998 Type SL9
• Country of Manufacture: USA
• Note: Motor logic cover piece is missing
• Includes: Motor starter unit only — no additional cables or accessories

Applications

The Square D Class 8536 series are full-voltage across-the-line motor starters widely used in industrial facilities for controlling three-phase AC motors on pumps, compressors, conveyors, fans, machine tools, and HVAC equipment. NEMA Size 4 starters handle motors up to 100HP at 480/575V, placing them in the upper-mid range for industrial motor control — suitable for demanding applications such as large centrifugal pumps, industrial air compressors, and heavy conveyor drives. Square D Class 8536 starters conform to NEMA ICS 2 standards and have been a mainstay of U.S. industrial electrical panels since the mid-twentieth century; the Form S / Series A configuration with a 600VAC maximum rating is particularly common in manufacturing, water/wastewater treatment, and process industries. Replacement contact kits (Class 9998 Type SL9) remain commercially available, making this unit a serviceable spare or working installation candidate.