Square D 8536SCG3V02S NEMA Size 3 Magnetic Motor Starter

The Square D 8536SCG3V02S is a magnetic motor starter from the Class 8536 series, designed for starting and stopping three-phase AC motors. It is a NEMA size 3 starter rated for motors up to 30 hp at 240 V, 50 hp at 480 V, and 60 hp at 600 V. The unit includes an electromechanical contactor and a built-in overload relay for thermal protection. The open-style enclosure (no outer case) is intended for installation inside a control panel.

Electrical Ratings

Contactor: rated continuous current 90 A. AC-3 rating (three-phase): 400 V: 45 kW, 690 V: 55 kW. Coil voltage: 120 V AC, 60 Hz (inrush VA 900, sealed VA 100). Overload relay: bimetallic, adjustable from 27 to 45 A (class 20 trip curve). The starter has three power poles (3 NO) for line and load connection. Control circuit: two auxiliary contacts (1 NO + 1 NC) are provided as standard.

Protection Features

The overload relay includes ambient temperature compensation, phase loss sensitivity, and manual/automatic reset selection. A trip indicator shows when the overload has opened. The contactor has an encapsulated coil for moisture resistance and integral arc chutes for safe interruption of fault currents up to 10 kA (with appropriate fuses). Short-circuit protection must be provided upstream (recommended fuse type CC or J).

Mechanical and Mounting

Dimensions: 6.0 in x 6.5 in x 5.5 in (W x H x D). Weight: 4.5 lb. The starter mounts via four keyhole slots on a backplane (screws not included). Terminal type: box lugs for #4 AWG to #14 AWG copper wire. Tightening torque: 31 in-lb for power terminals, 20 in-lb for control terminals. Operating temperature: -10°C to 60°C. The unit meets NEMA standards ICS 2-2000 and UL 508 listing.

Installation and Wiring

The starter accepts incoming line voltage on L1, L2, L3 and outgoing motor leads on T1, T2, T3. The coil is wired to A1 and A2 (120 V AC). The overload relay’s NC contact (95-96) must be wired in series with the coil’s seal-in circuit. An optional auxiliary contact block (e.g., 8501X040) can be added to the side. The starter’s open design requires a clean, dust-free cabinet.

Typical Applications

Used for across-the-line starting of pumps, compressors, conveyors, HVAC fans, and industrial mixers. The NEMA design provides ruggedness and serviceability; contacts can be replaced without removing the unit from the panel. The 8536SCG3V02S is a common choice for machine tool controls and agricultural equipment.