Overview
The Square D 8736SDO1 is a Type S reversing magnetic motor starter designed for full-voltage starting, stopping, and reversing of AC squirrel cage motors. As a NEMA Size 2 unit, the 8736SDO1 delivers a 45-ampere rating with solid mechanical and electrical interlock protection to prevent forward/reverse contactor conflicts. This open-type, vertically arranged starter includes a Motor Logic overload relay rated for Class 30 protection over a 15A to 45A sensing range.
Key Features
- NEMA Size 2, Type S reversing configuration – Delivers 10 HP at 200V, 15 HP at 230V, and 25 HP at 460/575V ratings (three-phase)
- 45-ampere rated capacity – Suitable for small to mid-size motor reversing applications
- Mechanically and electrically interlocked contactors – Twin 8502S NEMA contactors prevent unsafe simultaneous forward/reverse contact closure
- 110/120V AC 50/60 Hz control coil – Wired for separate control circuit operation
- Motor Logic overload relay – Class 30 thermal overload with 15–45A adjustable range for current sensing
- UL Listed and CSA Certified – Meets NEMA standards and safety requirements; 100 kA SCCR rating when protected by appropriate circuit breaker or fuse
- Open device design – Compact open enclosure (no separate housing required); dimensions 13.46 H × 6.73 W × 6.02 D inches
Technical Specifications
| Class | 8736 (NEMA reversing starter) |
| Type | S – Type S magnetic reversing starter |
| NEMA Size | 2 |
| Ampere Rating | 45 A |
| HP Ratings (3-Phase) | 10 HP @ 200V, 15 HP @ 230V, 25 HP @ 460/575V |
| Poles | 3-pole, 3-phase |
| Control Coil Voltage | 110/120V AC, 50/60 Hz |
| Control Circuit | Separate control |
| Contactors | Two 8502S NEMA contactors, mechanically/electrically interlocked |
| Overload Relay | Motor Logic Type, Class 30, range 15–45A |
| Arrangement | Vertical open type |
| Dimensions | 13.46 H × 6.73 W × 6.02 D inches |
| Enclosure | Open device (no housing) |
| SCCR Rating | 100 kA @ UL508A (with proper breaker/fuse protection) |
| Certifications | UL Listed, CSA Certified |
| Coil Type | Replaceable; available in multiple voltages |
Typical Applications
- Reversing control of three-phase AC induction motors in pumping systems, compressors, and fans
- Forward/reverse motor operation in conveyor systems, mixers, and agitators
- General industrial automation requiring motor reversing without auxiliary controls
- HVAC and process equipment requiring bidirectional motor control
- OEM equipment integration where NEMA-standard reversing starters are required
Compatibility & Replacements
Compatible With
- Three-phase AC squirrel cage motors rated up to 25 HP (460/575V) or equivalent lower-voltage ratings
- NEMA-standard motor control circuits with 110/120V AC control power
- Standard enclosed or open-type starter cabinets and control enclosures
- Auxiliary devices including overload relay accessories and mechanical interlocks
Replaces / Drop-In Replacement For
The Square D 8736SDO1V02S and variant models with identical specifications (Class 8736, Type S, NEMA Size 2, 45A, vertical arrangement, 110/120V coil) are direct equivalents. Always verify control coil voltage and motor horsepower requirements before substitution. For units with different voltage coils (e.g., 208V, 240V), contact your system integrator.
Works With
- Square D (Schneider Electric) NEMA contactors, overload relays, and accessory products
- Standard industrial control transformers and motor control circuits
- UL-listed combination starters (Classes 8538, 8539) when integrated as standalone reversing modules
- Mechanical and electrical interlock systems for safe bidirectional motor operation
- Motor overload protective devices and short-circuit protection per UL508A
