The Castair 5-184-3 is a 5 HP Open Drip Proof (ODP) electric motor for Cast Air three-phase compressor applications — 208/230V/460V three-phase, NEMA 184T frame, 1725 RPM. This is the OEM replacement motor for Castair compressor models specifying a three-phase motor in the 5 HP class. The three-phase version comes in at $688.03 — slightly less than the single-phase equivalent because 3-phase motors are simpler in construction (no start capacitors, no centrifugal switches).
Three-Phase Motor Advantages for Compressors
If your facility runs three-phase power, this is the motor you want in your compressor. Three-phase motors start smoother (no capacitor kick, no start winding), run cooler under load, and have fewer components to fail compared to single-phase motors of the same horsepower. The 208/230/460V triple-voltage rating means this motor can be wired for either 208/230V or 460V three-phase service — one part number covers both voltage levels depending on how you configure the motor leads.
Key Features
- 5 HP, three-phase: OEM power rating for applicable Castair compressor models with 3-phase electrical supply
- 208/230V/460V — triple voltage: Wire for 230V or 460V three-phase service from a single motor
- 1725 RPM: 4-pole speed — matched to pump RPM requirements of applicable Castair compressors
- NEMA 184T frame: Standard foot-mount frame — direct bolt-in replacement for the 184T installation
- Open Drip Proof enclosure: Ventilated for cooling in clean, dry indoor environments
- Castair OEM specification: Correct replacement for 3-phase Castair compressor models requiring this motor
Technical Specifications
- Horsepower: 5 HP
- Voltage: 208/230V / 460V
- Phase: 3-phase
- RPM: 1725
- NEMA frame: 184T
- Enclosure: ODP (Open Drip Proof)
- Manufacturer: Cast Air / Castair
- SKU: 5-184-3
- Price: $688.03 — call for pricing and availability
Wiring the Triple-Voltage Motor
208/230/460V three-phase motors have 9 lead wires that can be connected in either a wye (star) or delta configuration depending on the voltage. For 230V operation, the leads are connected in the high-voltage delta configuration; for 460V, they connect in the low-voltage wye configuration. A wiring diagram is typically affixed to the inside of the motor terminal box cover. If you are not experienced with 3-phase motor wiring, have a licensed electrician complete the connection.
Applications
- Motor replacement on Cast Air / Castair three-phase compressors specifying a 5 HP, 184T frame, 1725 RPM motor
- Shops and facilities with 3-phase electrical service (208/230V or 460V)
- Industrial facilities, truck shops, fleet maintenance, and manufacturing environments
- Compressor rebuilds requiring OEM motor specification
Why Buy From OEM Diagnostic Tools?
We have supplied Cast Air compressor motors and components to shops and industrial buyers since 2016. A motor is a significant investment — call us at 866-217-0063 before ordering to confirm the correct motor for your Castair compressor model and your facility power supply. We will verify frame, voltage, and RPM against your compressor serial number. Free shipping on qualifying orders.
Call 866-217-0063 for quick answers and help!
