Overview
The Square D 8736-SC07 S A is a robust NEMA Size 1 reversing motor starter designed for full voltage starting, stopping, and reversing of three-phase AC squirrel cage motors. This Class 8736 Type S reversing starter combines two 8502S NEMA contactors with mechanical and electrical interlocking plus an integrated overload relay, making it a complete motor control solution for industrial applications. The Series A model features a 120/110 V AC coil rated for 50/60 Hz operation.
Key Features
- NEMA Size 1 with full reversing control capability via interlocked contactors
- Integrated melting alloy overload relay for motor protection
- 120/110 V AC coil (50/60 Hz) — commonly used control voltage across North American industrial facilities
- 3-pole configuration for three-phase motor control
- Approved for use in NEMA 1 enclosures (general-purpose industrial environments)
- Mechanical interlocking prevents simultaneous forward and reverse contactor closure
Technical Specifications
- Class: 8736 (Square D NEMA Reversing Starters)
- Type: SC (Reversing)
- NEMA Size: 1
- Series: A
- Coil Voltage: 120/110 V AC, 50/60 Hz
- Motor Rating: 10 HP (at standard voltages)
- Poles: 3-pole (three-phase)
- Overload Relay Type: Melting alloy with thermal unit sensing
- Enclosure Type: Open/Vertical mounting
- Dimensions (Approx.): 5.5″ × 5.5″ × 12″
- Weight (Approx.): 10 lbs per unit
- SCCR Rating: 5 kA per UL508A (with appropriate overcurrent protection)
Typical Applications
- Pump and fan motor control in HVAC, water treatment, and industrial circulation systems
- Conveyor belt reversing control (forward/stop/reverse operation)
- Hoist and material handling equipment requiring directional control
- Machine tool spindle motors and cutting head actuators
- General industrial process motors up to 10 HP capacity
- Retrofit replacement in legacy control panels and machinery
Compatibility & Replacements
Compatible With
- Three-phase AC motors (50/60 Hz, NEMA design)
- 120 V AC control circuits and pilot devices
- Standard NEMA 1 enclosure installations
- Auxiliary contacts for sequence control and status indication
- Class L fuses and standard circuit breakers for motor branch protection
- Type B thermal overload units (standard Square D melting alloy relays)
Replaces / Drop-In Replacement For
- Other Square D 8736-SC07 Series A units
- Legacy Square D Class 8536/8738 contactors (verify coil and size matching)
- Verify exact mechanical and electrical configuration with your system integrator before ordering — some models may require field modification kits (Class 9999 available)
Works With
- Square D overload relays (Class 8522-C, 8522-D, and related thermal units)
- Electromechanical control transformers (120 V step-down from higher-voltage pilot circuits)
- NEMA pushbutton stations and selector switches with 1 N.O. holding contact and 1 N.C. auxiliary for reversing interlocking
- Time delay relays and logic control circuits for sequencing
- Standard industrial three-phase motor wiring (NEMA color codes)
