EM3-71-4-0.25
IE3 premium efficiency motor · 0.25 kW · 4 pole · 1420 rpm
Performance · 50 Hz, rated values
| Output | 0.25 kW |
|---|---|
| Poles · synchronous speed | 4 · 1500 rpm |
| Rated speed | 1420 rpm |
| Rated torque MN | 1.68 Nm |
| Current at 230 V | 1.32 A |
| Current at 400 V | 0.76 A |
| Current at 690 V | – |
| Current at SF 1.15, 400 V | 0.82 A |
| Efficiency 100 / 75 / 50 % | 73.5 / 72 / 66 |
| Power factor 100 / 75 / 50 % | 0.65 / 0.55 / 0.44 |
| Efficiency class | IE3 (IEC 60034-30-1) |
| Locked-rotor torque MA/MN | 2 |
|---|---|
| Starting current IA/IN | 4.2 |
| Breakdown torque MK/MN | 2.3 |
| Pull-up torque MS/MN | 1.6 |
| Rotor inertia J | 0.00097 kgm² |
| Sound pressure LPA at 1 m | 38 dB(A) |
| Insulation | Class F, temperature rise class B |
| Enclosure · cooling | IP55 · IC411 TEFC |
| Ambient | −20 °C to +40 °C |
| Service factor | 1.15 at 400 V 50 Hz (S1) |
| Bearings DE / NDE | 6003ZZ / 6003ZZ |
Torque–speed curve indicative
Drawn through the catalogue points MA, MS, MK and MN. Request the tested curve for your application.
Part-load performance
Efficiency determined to IEC 60034-2-1. Values on a 400 V winding (230 V for single-phase), subject to IEC tolerances.
60 Hz · for North America
| Supply | 230/460 V · 60 Hz · 9 lead |
|---|---|
| Output (calculated) | 0.29 kW · 0.39 HP |
| Nameplate HP | 1/3 HP |
| Speed | 1720 rpm |
| Torque | 1.18 lb-ft · 1.6 Nm |
| Full-load amps at nameplate HP · 460 V | ≈ 0.71 A |
| Full-load amps at nameplate HP · 230 V | ≈ 1.42 A |
| Estimated efficiency at 60 Hz | ≈ 73.8 % |
| Service factor | 1.25 · heat-run verified |
| SF amps · 460 V | ≈ 0.78 A |
| SF amps · 230 V | ≈ 1.56 A |
| Locked-rotor amps · 460 V / 230 V | ≈ 3.1 / 6.2 A |
| Code letter | J |
| Winding | Wye · T1 to T9, series at 460 V, parallel at 230 V |
About these values
Calculated from EMPD rated 50 Hz / 400 V data (output × 1.15, speed = 60 Hz synchronous speed minus the 50 Hz slip) and confirmed by test on order with a 60 Hz test certificate. 230/460 V, 9 lead: two identical sections per phase. 230 V line currents are 2 × the 460 V values, and all other figures are the same on both voltages; wiring diagrams are in EMPD-DS-IE-60. SF 1.25 proven by heat run at type test; report supplied at first-article approval. Estimated 60 Hz efficiency uses a loss model, about ±1 point, for the -60 build; the measured value is on the test certificate. Continuous-duty (S1) motors sold in the US must meet NEMA Premium efficiency and be DOE-certified. Please contact EMPD to discuss.
Frames are IEC metric; NEMA frames 56C to 256T built to MG 1 on request. Please confirm certification requirements (e.g. UL / CSA) at enquiry.
Dimensions · IM B3, frame 71
Schematic outline for orientation, not to scale for manufacture. Request the certified drawing (PDF / DXF / STEP) with your enquiry.
| AFoot hole spacing, end | 112 mm |
|---|---|
| BFoot hole spacing, side | 90 mm |
| CShaft shoulder to foot hole | 45 mm |
| HShaft centre height | 71 mm |
| KFoot hole diameter | 7 mm |
| LOverall length | 238 mm |
| ACBody diameter | 140 mm |
| HDOverall height | 186 mm |
| DShaft diameter | 14 mm |
| EShaft length | 30 mm |
| MFlange B5 · pitch circle | 130 mm |
| NFlange B5 · spigot | 110 mm |
| PFlange B5 · outside diameter | 160 mm |
| SFlange B5 · hole diameter | 10 mm |
Mountings B3, B5, B14, B35 and B34 on every rating. Shaft tolerance to IEC 60072. NEMA frames 56C to 256T built to MG 1 on request.