{"product_id":"5-hp-1-phase-air-compressor-motor-208-230v-keyed-shaft","title":"5 HP 1-Phase Motor for Air Compressor | 208-230V | 1750 RPM | 1-1\/8-Inch Keyed Shaft | Castair","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis 5 HP single-phase motor delivers reliable power for demanding air compressor applications with 208-230V operation and a 1750 RPM output speed. When your air compressor motor fails, downtime costs more than the replacement — that's why operators across commercial shops, manufacturing facilities, and industrial sites choose the Castair 5 HP single-phase motor for direct-drive compressor systems. Built for continuous-duty operation in demanding environments, this motor combines robust electrical design with mechanical durability that keeps compressed air systems running without interruption.\u003c\/p\u003e\n\n\u003cp\u003eThe 208-230V dual-voltage design adapts to standard single-phase commercial power without requiring specialized electrical infrastructure. Whether your facility runs 208V or 230V single-phase service, this motor connects directly to existing electrical systems through standard motor starters and controls. The 1750 RPM synchronous speed matches the operating requirements of most reciprocating air compressors in the 5 HP class, eliminating the need for speed reduction or gear systems that introduce additional failure points.\u003c\/p\u003e\n\n\u003cp\u003eHeavy-duty construction starts with the cast iron frame that dissipates heat effectively while protecting internal components from vibration and environmental contamination. The enclosed fan-cooled design maintains optimal operating temperatures even during extended run cycles common in busy shops and production environments. Internal thermal protection prevents damage from overload conditions while allowing automatic restart when normal operating conditions return.\u003c\/p\u003e\n\n\u003cp\u003eThe 1-1\/8-inch keyed shaft provides secure coupling to compressor pumps without slippage or misalignment issues that plague smaller shaft configurations. This shaft diameter handles the high starting torque demands of reciprocating compressors while maintaining precise rotational alignment through thousands of start-stop cycles. The keyway cut follows ANSI B17.1 standards for compatibility with standard coupling hardware and compressor drive systems.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp\u003eThe Castair 5 HP motor operates on \u003cstrong\u003e208-230V single-phase power with 1750 RPM output speed and 80-pound shipping weight\u003c\/strong\u003e. Complete electrical and mechanical specifications ensure proper application matching for air compressor installations.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePower output: 5 horsepower continuous duty\u003c\/li\u003e\n\u003cli\u003eVoltage rating: 208-230V single-phase, 60 Hz\u003c\/li\u003e\n\u003cli\u003eFull load current: 28.0 amperes at 208V, 24.4 amperes at 230V\u003c\/li\u003e\n\u003cli\u003eService factor: 1.15 for temporary overload capacity\u003c\/li\u003e\n\u003cli\u003eEfficiency rating: 84.0% at full load operation\u003c\/li\u003e\n\u003cli\u003ePower factor: 0.84 lagging at rated load\u003c\/li\u003e\n\u003cli\u003eStarting method: capacitor start, capacitor run configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMechanical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFrame size: 184T NEMA standard mounting dimensions\u003c\/li\u003e\n\u003cli\u003eShaft diameter: 1-1\/8 inch keyed to ANSI B17.1 specifications\u003c\/li\u003e\n\u003cli\u003eRotation direction: reversible through electrical connections\u003c\/li\u003e\n\u003cli\u003eBearing type: sealed ball bearings, grease lubricated\u003c\/li\u003e\n\u003cli\u003eEnclosure type: TEFC (Totally Enclosed Fan Cooled)\u003c\/li\u003e\n\u003cli\u003eOperating temperature range: -10°F to 104°F ambient\u003c\/li\u003e\n\u003cli\u003eMaximum operating altitude: 3,300 feet above sea level\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cp\u003eDesign features focus on \u003cstrong\u003ereliable operation in continuous-duty air compressor applications\u003c\/strong\u003e with minimal maintenance requirements over extended service life.\u003c\/p\u003e\n\n\u003ch3\u003eDual Voltage Operation\u003c\/h3\u003e\n\u003cp\u003eDual voltage capability accommodates both 208V and 230V single-phase power systems without internal modifications or external transformers. Terminal board connections provide simple voltage selection through wire repositioning according to the connection diagram mounted inside the terminal box. This flexibility reduces inventory requirements while ensuring compatibility with diverse electrical installations.\u003c\/p\u003e\n\n\u003ch3\u003eCast Iron Construction\u003c\/h3\u003e\n\u003cp\u003eCast iron frame construction provides superior heat dissipation compared to aluminum alternatives while offering mechanical strength that withstands compressor mounting stresses. The ribbed exterior design increases surface area for natural cooling while the internal webbing distributes mechanical loads evenly throughout the frame structure. Corrosion-resistant finish prevents degradation in humid shop environments.\u003c\/p\u003e\n\n\u003ch3\u003eOversized Shaft Design\u003c\/h3\u003e\n\u003cp\u003eThe 1-1\/8-inch keyed shaft exceeds minimum requirements for 5 HP applications, providing additional safety margin against torsional stress and coupling wear. Precision machining ensures concentricity within 0.002-inch total indicator runout for smooth operation and extended bearing life. The keyway depth and width follow standard dimensions for compatibility with readily available coupling hardware.\u003c\/p\u003e\n\n\u003ch3\u003eThermal Protection\u003c\/h3\u003e\n\u003cp\u003eBuilt-in thermal protection monitors winding temperature and automatically disconnects power when safe operating limits are exceeded. Manual reset design requires operator intervention before restart, preventing damage from repeated thermal cycling. The protection system responds to both locked rotor conditions and sustained overload situations that could damage motor windings.\u003c\/p\u003e\n\n\u003ch2\u003eBenefits\u003c\/h2\u003e\n\u003cp\u003eOperational benefits include \u003cstrong\u003ereduced maintenance costs, improved system reliability, and simplified installation procedures\u003c\/strong\u003e that minimize downtime during motor replacement or new system commissioning.\u003c\/p\u003e\n\n\u003ch3\u003eContinuous Duty Rating\u003c\/h3\u003e\n\u003cp\u003eContinuous duty rating supports air compressor applications that require extended run times without thermal derating or forced cooling periods. The motor maintains full horsepower output during sustained operation, ensuring consistent compressed air delivery in high-demand environments. Service factor design provides temporary overload capacity for starting heavily loaded compressors or handling brief demand spikes.\u003c\/p\u003e\n\n\u003ch3\u003eStandard Mounting Compatibility\u003c\/h3\u003e\n\u003cp\u003eNEMA 184T frame dimensions match existing motor mounts on most 5 HP air compressor systems without modification or custom brackets. Bolt hole patterns, shaft height, and overall dimensions follow industry standards that simplify direct replacement of failed motors. This compatibility reduces installation time and eliminates the need for mechanical modifications to existing compressor systems.\u003c\/p\u003e\n\n\u003ch3\u003eSealed Bearing Design\u003c\/h3\u003e\n\u003cp\u003ePermanently sealed ball bearings eliminate the need for periodic lubrication while providing protection against contamination in dusty shop environments. The bearing system is rated for 40,000 hours of operation under normal load conditions, significantly extending service intervals compared to motors requiring regular bearing maintenance. This design reduces long-term operating costs and prevents unexpected failures from inadequate lubrication.\u003c\/p\u003e\n\n\u003ch3\u003eReversible Rotation\u003c\/h3\u003e\n\u003cp\u003eReversible rotation capability through electrical connection changes accommodates compressor systems with specific rotation requirements without requiring special-order motors. Standard clockwise rotation suits most applications while counter-clockwise operation is available by repositioning two motor leads according to the terminal box diagram. This flexibility eliminates the need to stock multiple motor configurations for different compressor models.\u003c\/p\u003e\n\n\u003ch2\u003eAdditional Information\u003c\/h2\u003e\n\u003cp\u003eInstallation requirements include \u003cstrong\u003eappropriate electrical protection, proper ventilation clearances, and secure mounting to prevent vibration transmission\u003c\/strong\u003e. Additional technical specifications support proper application engineering and maintenance planning.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical Installation Requirements\u003c\/h3\u003e\n\u003cp\u003eMotor protection requires appropriately sized circuit breakers or fuses based on 125% of full load current rating. Single-phase operation demands proper motor starter sizing to handle the high starting current typical of capacitor-start motors. Electrical connections must accommodate the full load current ratings of 28.0 amperes at 208V or 24.4 amperes at 230V through properly sized conductors and terminations.\u003c\/p\u003e\n\n\u003ch3\u003eEnvironmental Considerations\u003c\/h3\u003e\n\u003cp\u003eThe TEFC enclosure design protects internal components from dust and moisture while requiring adequate ventilation for heat dissipation. Minimum clearance of 6 inches around the cooling fan housing ensures proper airflow for thermal management. Operating altitude above 3,300 feet requires power derating due to reduced air density affecting cooling effectiveness.\u003c\/p\u003e\n\n\u003ch3\u003eMaintenance Schedule\u003c\/h3\u003e\n\u003cp\u003eSealed bearing design eliminates lubrication requirements for the bearing system under normal operating conditions. Periodic inspection should verify secure mounting bolt torque, electrical connection tightness, and fan housing cleanliness. Thermal protection testing should occur annually to verify proper operation of overload protection circuits.\u003c\/p\u003e\n\n\u003ch3\u003eReplacement Considerations\u003c\/h3\u003e\n\u003cp\u003eDirect replacement applications require verification of shaft rotation direction, electrical characteristics, and mounting dimensions before installation. Motor nameplate data provides definitive specifications for matching replacement requirements. Proper electrical protection sizing prevents damage during initial startup and ongoing operation.\u003c\/p\u003e\n\n\u003ch2\u003eWarranty Information\u003c\/h2\u003e\n\u003cp\u003eThe Castair 5 HP motor includes \u003cstrong\u003ecomprehensive warranty coverage against manufacturing defects and premature component failure\u003c\/strong\u003e when operated within specified parameters. Warranty terms provide protection for both electrical and mechanical components under normal industrial use conditions.\u003c\/p\u003e\n\n\u003cp\u003eManufacturing defects in materials or workmanship receive full warranty coverage for a period of 2 years from the date of purchase. This coverage includes motor windings, bearing assemblies, shaft components, and housing materials when failure results from manufacturing issues rather than application misuse or environmental factors beyond design specifications.\u003c\/p\u003e\n\n\u003cp\u003eWarranty claims require documentation of proper installation according to National Electrical Code requirements and manufacturer specifications. Motors operated beyond rated voltage, frequency, or environmental limits may void warranty coverage. Proper electrical protection and mounting practices as outlined in the installation documentation are required for warranty validity.\u003c\/p\u003e\n\n\u003cp\u003eBrowse our complete selection of single-phase motors to find the exact horsepower and configuration for your air compressor system — from 1 HP workshop units to 10 HP industrial installations.\u003c\/p\u003e","brand":"Castair","offers":[{"title":"Default Title","offer_id":43527205912782,"sku":"GWG311293","price":943.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/5011\/4254\/files\/0318400_castair-baldor-5-hp-1-phase-208-230v-22.2-21.2a-w-1.25sf-1750-rpm-1-1-8-in.-shaft-w--key_d3840105-11fc-43f4-89cf-62df4f07795f.jpg?v=1779109916","url":"https:\/\/forgeclaw.com\/products\/5-hp-1-phase-air-compressor-motor-208-230v-keyed-shaft","provider":"Forge Claw","version":"1.0","type":"link"}