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The Baldor EM3311T is a 7.5 HP three-phase air compressor duty electric motor built to handle the high starting load and torque that air compressors demand. It can be wired to run in either direction (CW or CCW).
Replacing a compressor motor? Match the frame, shaft, and mounting to your existing motor — and if you change the RPM, resize the pulley or sheave to keep your compressor's CFM. Not sure it will fit your setup? Contact us with your old motor's nameplate and we'll confirm the right replacement before you buy.
Backed by a Baldor (ABB) NEMA Premium limited manufacturer's warranty — 36 months from installation or 42 months from date of manufacture, whichever comes first. We package every motor carefully so it arrives ready to install, and we stand behind every sale. Questions about fit or specs? Get in touch.
A magnetic starter protects this motor from overload and lets a pressure switch turn it on and off. Choose the one that matches how you wire the motor.
Shihlin Electric 7.5 HP 3-phase
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| Horsepower | 7.5 HP |
|---|---|
| Speed Full-load (nameplate) shaft speed. | 1770 RPM |
| Frame NEMA frame size — sets the mounting bolt pattern, shaft height and shaft diameter. | 213T |
| Voltage | 460-230 V |
| Phase | Three Phase |
| Enclosure Motor housing type, e.g. TEFC (Totally Enclosed Fan Cooled) or ODP (Open Drip Proof). | OPSB |
| Mounting | Foot Mount (Rigid Base) |
| Shaft diameter | 1-3/8" |
| Country of origin Where this motor is manufactured, per the manufacturer / supplier documentation. | United States |
| Full load amps (low voltage) Rated running current on the low-voltage connection. | 19.6 A |
|---|---|
| Full load amps (high voltage) Rated running current on the high-voltage connection. | 9.8 A |
| Locked rotor amps Inrush current drawn at startup, before the motor begins to turn. | 72.0 A |
| NEMA code letter NEMA locked-rotor kVA/HP code letter. | J |
| Efficiency at full load | 91.0% |
| Power factor Ratio of real to apparent power at full load. | 79% |
| Rated torque Continuous torque produced at the rated speed and load. | 22.3 ft-lb |
|---|---|
| Locked rotor torque Starting torque as a percentage of rated torque. | 204% |
| Breakdown torque Maximum torque the motor can produce before it stalls, as a percentage of rated torque. | 336% |
| Slip Percentage the loaded speed falls below synchronous speed. | 1.7% |
| Service factor Permissible continuous overload multiplier, e.g. 1.15 = 15% over rated HP. | 1.15 |
| NEMA design NEMA design letter (A/B/C/D) describing the torque and starting-current profile. | A |
| Frame material | Steel |
|---|---|
| Bearing (drive end) | 6307 |
| Bearing (opposite drive end) | 6206 |
| Lubricant / grease | Polyrex EM (-20F to +300F) |
| Overall length | 16.3″ |
| Overall height From the base feet to the top of the frame. | 10.04″ |
|---|---|
| Overall width Widest point, including the terminal (conduit) box. | 12.65″ |
| Frame body diameter | 9.57″ |
| Shaft diameter Finished diameter of the drive shaft. | 1.375″ |
| Shaft extension length Usable shaft length beyond the motor face. | 3.38″ |
| Shaft keyway (W × L) | 0.31″ × 2.38″ |
| Base length | 8.0″ |
| Base width | 9.5″ |
| Mounting holes Number of holes in the mounting feet. | 6 |
| Mounting hole diameter | 0.43″ |
| Mounting hole spacing (F-B × S-S) Foot bolt-hole spacing: front-to-back × side-to-side. | 7.0″ × 8.5″ |
| Lead hole diameter | 1.38″ |
| Grease fitting location | Each End |
| Lifting lug configuration | Each End |
| Insulation class Winding insulation temperature rating (A/B/F/H). | F |
|---|---|
| Duty cycle S1 / Continuous means the motor can run indefinitely at rated load. | CONT |
| Ambient temperature Surrounding air temperature the rating is based on. | 40°C |
| Rotation | Reversible |
| Inverter rated Whether the windings are rated for variable-frequency-drive (VFD) operation. | Yes |
| Agency approvals | CURUSEEV, NEMA PREMIUM |
| Leads / wire size | 9 @ 14 AWG |
|---|---|
| Lead termination | Flying Leads |
| Connection diagram | 9-Lead, 3PH Dual Voltage (Low 2Y / High 1Y) — CD0005 |
| Catalog number | EM3311T |
| Product code | 37F614L863G1 |
