YFBX4-355S is the 355S frame size (shaft height H = 355 mm) of the Shangli YFBX4 Series High-Efficiency Dust Ignition-Proof Three-Phase Induction Motors. It covers 90–200 kW in 2 / 4 / 6 / 8 / 10-pole versions with Ex marking Ex tb IIIC T135°C Db, for plants with combustible dust atmospheres; efficiency to China GB 18613-2020 efficiency grade 2. The tables below list performance data and mounting dimensions for all 7 standard models on this frame.
- Series
- YFBX4 Series High-Efficiency Dust Ignition-Proof Three-Phase Induction Motors
- Frame size / shaft height
- 355S / H = 355 mm
- Output range
- 90–200 kW
- Poles
- 2 / 4 / 6 / 8 / 10
- Ex marking
- Ex tb IIIC T135°C Db
- Explosion protection standard
- GB/T 3836.1 (general requirements) and GB/T 3836.31 (equipment dust ignition protection by enclosure “t”)
- Cooling
- IC411
- Efficiency
- China GB 18613-2020 efficiency grade 2
- Area of use
- Plants with combustible dust atmospheres
Performance data
| Model | Output kW | Output HP | Poles | Speed r/min | Current A (380 V) | Torque N·m | Efficiency % | Power factor cosφ | Locked-rotor torque / rated torque | Locked-rotor current / rated current | Breakdown torque / rated torque | Noise LwA dB(A) | Weight kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| YFBX4-355S1-2 | (185) | 248.1 | 2 | 2980 | 327.3 | 592.9 | 96.5 | 0.89 | 1.6 | 8.5 | 2.2 | 98 | 1619 |
| YFBX4-355S2-2 | (200) | 268.2 | 2 | 2980 | 353.8 | 640.9 | 96.5 | 0.89 | 1.6 | 8.5 | 2.2 | 98 | 1619 |
| YFBX4-355S1-4 | (185) | 248.1 | 4 | 1488 | 323.0 | 1187.3 | 96.7 | 0.90 | 2.2 | 8.5 | 2.2 | 94 | 1672 |
| YFBX4-355S2-4 | (200) | 268.2 | 4 | 1488 | 349.2 | 1283.6 | 96.7 | 0.90 | 2.2 | 8.5 | 2.2 | 94 | 1718 |
| YFBX4-355S-6 | 160 | 214.6 | 6 | 995 | 293.8 | 1535.7 | 96.2 | 0.86 | 2.0 | 8 | 2.0 | 92 | 1754 |
| YFBX4-355S-8 | 132 | 177 | 8 | 740 | 260.9 | 1703.5 | 94.9 | 0.81 | 1.8 | 7.7 | 2 | 90 | 1630 |
| YFBX4-355S-10 | (90) | 120.7 | 10 | 593 | 192.8 | 1449.4 | 92.8 | 0.77 | 1.5 | 5.9 | 2 | 90 | 1526 |
Values at 380 V, 50 Hz, duty S1. Rated torque is calculated as T = 9550 × P / n. Outputs in brackets are non-preferred ratings. Final values are those in the routine test report.
Mounting dimensions (mm)
| Applies to | A | B | C | H | K | D | E | F | G |
|---|---|---|---|---|---|---|---|---|---|
| 2-pole | 610 | 500 | 254 | 355 | 28 | 75 | 140 | 20 | 67.5 |
| 4-pole and above | 610 | 500 | 254 | 355 | 28 | 95 | 170 | 25 | 86 |
| Flange | M | N | P | R | α | Holes × dia. | T |
|---|---|---|---|---|---|---|---|
| FF740 | 740 | 680 | 800 | 0 | 22.5° | 8×Φ24 | 6.0 |
Outputs, mounting arrangements and mounting dimensions are the same as the YB3 series; feet, shaft extension and flange match YBX3 and YBX4 flameproof motors of the same frame size. The terminal box differs from the flameproof version, so overall dimensions are confirmed on the approval drawing.
Outline drawing
Selection notes
- Ex tb IIIC T135°C Db: tb is protection by enclosure, IIIC covers conductive dust and also IIIA combustible flyings and IIIB non-conductive dust; equipment protection level Db for Zone 21 and Zone 22; maximum surface temperature 135 °C.
- For plants with combustible dust such as flour, feed, sugar, grain processing, pharmaceuticals, plastic powder, coal powder and metal powder. For underground coal mines choose a flameproof motor.
- Check that T135 °C suits the minimum ignition temperature of the dust at site. Where explosive gas and dust are both present, choose a flameproof and dust ignition-proof version and state this in your enquiry.
- Outputs in brackets are non-preferred ratings; for the same output, choose the frame without brackets where possible.
Frequently asked questions
What is the difference between the YFBX4-355S and a flameproof motor?
A dust ignition-proof motor keeps dust out of the enclosure and limits surface temperature, for combustible dust areas. A flameproof motor has an enclosure that withstands an internal explosion, for explosive gas areas. Both have the same outputs and mounting dimensions; the terminal box design differs.
What is the Ex marking of the
Ex tb IIIC T135°C Db. Choose according to the type of dust and zone classification at site.
How can I get CAD drawings and the Ex certificate for the
Complete the selection form at the bottom of this page with the model, type of dust, zone, mounting arrangement and file format required (DWG, STEP or PDF). Our sales team will send the drawings, certificate documents and a quotation.