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A-B 509-FOD-XXX
Product Name: Bulletin 509 NEMA Size 5 Full-Voltage Non-Reversing Motor Starter
Introduction: This open-type motor starter provides direct-on-line starting and overload protection for large three-phase industrial motors. The XXX suffix denotes a base configuration normally supplied without heaters or optional auxiliary blocks.
Technical Specifications:
- Catalog: 509-FOD-XXX
Detailed content
- NEMA size: 5
- Configuration: full-voltage, non-reversing, 3-pole
- Continuous current: 270 A
- Maximum voltage: 600 V AC
- Control coil: 110 V AC at 50 Hz / 120 V AC at 60 Hz
- Motor rating: 75 HP at 230 V three-phase; higher HP at 460/575 V depending NEMA table
- Overload: eutectic alloy overload relay or solid-state relay per fitted configuration
- Enclosure: open type for panel mounting
- Auxiliary: 1 normally open standard interlock contact depending configuration
- Mechanical life: up to 5,000,000 operations under rated conditions
- Operating temperature: up to 65 °C ambient per defined rating
Material Composition: Silver-cadmium oxide main contacts, molded arc chutes, steel frame and mounting plate, copper power buses, enamel or coated enclosure parts, spring steel mechanism.
Structural Features: Electromagnetic contactor coil, triple-pole power path, top/bottom power terminals, removable overload relay section, vertical mounting footprint, manual test and reset access.
Working Principle: When the control coil is energized, the magnetic field closes the main contacts and applies full line voltage to the motor. The overload relay monitors current and opens the control circuit if sustained overload occurs, preventing thermal damage.
Application Scenarios: Pumps, compressors, conveyors, crushers, steel-processing auxiliaries, mining plants, municipal water systems and other high-current three-phase motor installations.
Installation Requirements: Mount vertically in a control panel with adequate short-circuit protection, torque power terminals to specification, select and install overload heaters matched to motor full-load current, verify coil voltage before energization, and label all control wires.
Usage Precautions: Apply lockout/tagout before maintenance, never operate without properly sized overload elements, inspect contact tips for erosion, keep arc chutes clean and undamaged, and replace the starter if pickup/dropout becomes erratic.
