Overview
The Square D 8736 SDO1 is a NEMA Size 2 reversing magnetic contactor designed for full-voltage starting, stopping, and reversing of AC squirrel cage motors. Class 8736 reversing magnetic starters are used for full voltage starting, stopping, and reversing AC squirrel cage motors. As a Type S (separate control unit) reversing device, the 8736 SDO1 delivers dependable performance in industrial and commercial motor control applications where separate overload protection is provided.
Key Features
- Reversing capability: Full forward and reverse motor control with mechanical and electrical interlock
- 3-pole, 3-phase: Designed for polyphase motor applications
- NEMA Size 2: Compact footprint suitable for 25 HP motors at 460/575 VAC
- Open-style enclosure: Horizontal arrangement for easy integration into control panels
- Series A construction: Proven design with melting-alloy overload protection compatibility
- Separate control unit: Independent coil circuit allows flexible auxiliary control and interlocking schemes
Technical Specifications
The Square D 8736 SDO1 meets NEMA standards for industrial motor starters with the following characteristics:
- Power Ratings: 25 HP @ 460/575 VAC; 15 HP @ 230 VAC; 10 HP @ 200 VAC
- Main Contact Current: 45 A at 600 VAC
- Coil Voltage Options: 110/120 VAC standard (50/60 Hz available)
- Poles: 3-pole for 3-phase motors
- Enclosure Type: Open style
- Overload Protection: Melting alloy thermal units (field-selectable)
Typical Applications
The 8736 SDO1 is well-suited for:
- Industrial motor starters requiring reversing control
- Fan and pump applications with forward/reverse capability
- Hoist and lift systems with directional control
- Machine tool auxiliary motor circuits
- Production line conveyor reversing control
- OEM equipment retrofits and replacement installations
Compatibility & Replacements
Compatible With
- Square D Class 8502 and 8536 contactors and starters
- NEMA-rated overload relays (thermal and electronic)
- Standard industrial control transformers (120V secondary)
- Auxiliary contacts and mechanical interlock kits
- Panel-mount enclosures (NEMA 1, 3R, 4, 12)
Replaces / Drop-In Replacement For
- Square D 8736 SD01 and 8736 SD02 Series A units (verify coil voltage and main contacts)
- Legacy reversing magnetic motor starters of equivalent NEMA Size 2 rating
Works With
- Square D legacy control systems and hard-wired motor control circuits
- NEMA-standard auxiliary relays, push buttons, and selector switches
- Thermal overload relay modules (Class 8710 and compatible classes)
- Mechanically interlocked reversing starter assemblies
