Explosion-proof motor
Wolong Electric Nanyang Explosion-ProofYFB3 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous Motor
The YFB3 series dust-explosion-proof three-phase asynchronous motors (frame heights 80–355), launched by Wolong Electric Nanyang Explosion-proof, are fully enclosed, self-ventilated, squirrel-cage, high-efficiency motors. They meet the 3-level energy efficiency (IE3) specified in GB18613-2020, "Energy Limits and Efficiency Grades for Small and Medium Three-Phase Asynchronous Motors." These motors feature superior performance, reliable and safe operation, and low vibration and noise levels. Their explosion-proof compliance meets GB/T 12476.1, "Electrical Apparatus for Use in Flammable Dust Environments – Part 1: General Requirements," and GB 12476.5, "Electrical Apparatus for Use in Flammable Dust Environments – Part 5: Enclosure Protection Type 'tD'." Suitable for explosive dust environments in zones 21 and 22, the explosion-proof marking is Ex tb IIIC T130℃ Db; it can also be configured as Ex tb IIIB T130℃ Db. These motors are widely used in grain and feed processing, wood processing, metal polishing and grinding, coal chemical industry, pharmaceuticals, textiles, port grain transport, and other sectors to drive general-purpose machinery such as fans, compressors, water pumps, crushers, conveyors, and centrifuges. Model Example: YFB3-160L-4 THWF1 - YFB3 indicates the dust-explosion-proof series with IE3 energy efficiency (GB18613-2020 3-level). - 160 denotes the frame height (mm). - L signifies a long foot mount. - 4 represents the number of poles (4). - Suffixes indicate environmental ratings: F1 (indoor, moderate corrosion), F2 (indoor, severe corrosion), WF1 (outdoor, moderate corrosion), WF2 (outdoor, severe corrosion), TH (humid tropics), G (high altitude); default is indoor.
Technical Specifications
- Housing Number80~355
- Rated Power0.18kW~375kW
- Efficiency RatingIE3 (GB18613-2020 3-level energy efficiency)
- Jisu2P, 4P, 6P, 8P (Optional 10P, 12P, 14P, 16P)
- Rated Voltage380V (Optional: 220/380V, 380/660V, 660/1140V, 400/690V, 400V, 415V, 660V, 690V, or custom per customer requirements)
- Rated Frequency50Hz (optional 60Hz)
- Working ModeS1 (Optional S2, S3; Customizable)
- Ambient Temperature-20℃~+40℃
- AltitudeNot exceeding 1000m
- HumidityMonthly average maximum relative humidity shall not exceed 90%.
- Installation MethodB3 (Optional: B5, B6, B7, B8, B14, B34, B35, V1, V3, V5, V6, V15, V18, V35, etc.)
- Wiring method3kW and below: 380V Y connection; motors above 3kW: 380V △ connection
- Ingress Protection RatingIP55 (Optional IP65)
- Insulation ClassClass F (H-class optional)
- Cooling MethodIC411
- Explosion-proof markingEx tb IIIC T130°C Db (optional: Ex tb IIIB T130°C Db)
- Suitable for Hazardous AreasExplosive dust environments, Zone 21, Zone 22
- Inlet ConfigurationFlared opening (standard configuration; optional threaded steel conduit or explosion-proof cable gland entry)
- Number of Inlets80~280 Single-port, 315, 355 Dual-port
- Motor Enamel Paint ColorLight Blue RAL5012 (Anti-corrosion and outdoor anti-corrosion types use Phthalocyanine Blue GSB05-1426PB04)
- EnvironmentIndoor (Optional: Outdoor W, Outdoor Moderate Corrosion Resistance WF1, Outdoor Severe Corrosion Resistance WF2, Indoor Moderate Corrosion Resistance F1, Indoor Severe Corrosion Resistance F2, Humid Tropical TH, Dry Tropical TA, Outdoor Humid Tropical THW, Outdoor Dry Tropical TAW)
- Temperature measurement and heating deviceHousing numbers 160–225: optional heating tape or PTC temperature sensor. Housing numbers 250–355: optional stator and bearing temperature sensors, heating tape, and explosion-proof breather with drainage valve.
- bearing80–132: sealed bearings; 160–355: open bearings. Grease interval: 2000–3000 h.
- StandardGB/T 755, GB 1971, GB/T 12476.1, GB 12476.5, GB 10068, GB 14711, GB 18613, GB 50058, GB/T 997, GB/T 1032, GB/T 1993, GB/T 4772, GB/T 4942.1, GB/T 10069.1, GB/T 10069.3, GB/T 22719.1
Key Advantages
Energy efficiency rating met: Efficiency meets the 3-level energy standard (IE3) specified in GB18613-2020, satisfying national energy efficiency access requirements.
Dust explosion-proof certification complete: Protection type tD housing, explosion-proof rating Ex tb IIIC T130°C Db. Suitable for Zone 21 and Zone 22 combustible dust environments; also available as Ex tb IIIB T130°C Db.
Low vibration, low noise: Optimized electromagnetic design and mechanical structure deliver lower vibration and noise than competing products.
Wide pole coverage: Standard 2/4/6/8 poles, optional 10/12/14/16 poles; synchronous speed 3000~375 r/min
Multi-voltage compatibility: Standard 380V, with optional 400V, 415V, 660V, 1140V, and more. For non-380V operating conditions, current is calculated as I = IN × 380 / U.
Interchangeable mounting: Frame sizes 80 to 355 comply with IEC and national standards, enabling quick replacement of existing dust-explosion-proof motors.
Flexible structural configuration: B3 standard installation with optional B5, B35, V1, B14, and B34 variants. Protection, insulation, and corrosion resistance ratings can be selected as needed.
Status monitoring: 160~225 motor bases can be equipped with heating bands or PTC temperature sensors; 250~355 motor bases can be fitted with stator and bearing temperature sensors along with explosion-proof breathers with drainage valves.
Environment-adaptive: Selectable codes for outdoor, moderate/strong corrosion resistance, wet tropical, dry tropical, and high-altitude environments.
Complete range of junction box specifications: Standard bellmouth design; optional threaded steel conduit or explosion-proof cable glands for sealed wiring in dusty environments.
Use Cases
Grain and Feed Processing Workshop
Woodworking and Furniture Manufacturing
Metal Polishing and Grinding Workshop
Coal Chemical Industry and Coal Powder Conveyance
Pharmaceuticals and Powder Processing
Textile Fiber Workshop
Port Grain Storage and Transportation
Fans and Pumps for Dusty Environments
Explosion Protection Rating Explanation
View All Explosion-Proof MotorsEnclosure protection for combustible dust environments
Suitable for Class IIIC combustible dust environments (conductive and non-conductive), including grain, feed, wood, and metal dust, in Zone 21 and Zone 22. T130°C indicates the equipment's maximum surface temperature does not exceed 130°C. Db denotes a high protection level.
Filter products at this levelExplosion-proof enclosure for Class IIIB combustible dust environments
Suitable for non-conductive combustible dust environments in Zones 21 and 22, specifically for fibrous and fluffy dusts classified as IIIB (excluding IIIC). Select according to the specific dust type present on-site.
Filter products at this levelExplosion-proof marking explanation: "Ex" denotes explosion-proof; "d" indicates a flameproof enclosure; "tb" signifies an enclosure protection type (for dust explosion-proof). "I", "IIA", "IIB", and "IIC" represent applicable gas groups, while "IIIA", "IIIB", and "IIIC" indicate applicable dust categories. "T1–T6" or "T130°C" specifies the temperature class and maximum surface temperature. "Mb", "Gb", and "Db" denote equipment protection levels. When selecting equipment, verify based on the site's hazardous area classification (gas zones 1, 2 or dust zones 21, 22), medium group, and temperature class.
Select by number of poles
View Full Parameter TableSynchronous Speed3000 r/min
- Power range
- 0.75~375kW
- Actual RPM
- 2875–2990 r/min
- Available Models
- 29a
Synchronous speed 3000 r/min; high speed, compact size, and low cost—ideal for light-load, high-speed applications such as fans, pumps, and compressors.
synchronous speed1500 r/min
- Power range
- 0.55~375kW
- Actual RPM
- 1425–1495 r/min
- Available Models
- 30a
Synchronous speed: 1500 r/min. With balanced speed and torque, it is the mainstream choice for general machinery, conveyor equipment, and mixing systems.
synchronous speed1000 r/min
- Power range
- 0.37~315kW
- Actual RPM
- 930–995 r/min
- Available Models
- 29a
Synchronous speed: 1000 r/min. High starting torque and smooth operation make it ideal for medium-to-low speed, heavy-load applications such as crushers, ball mills, and reciprocating pumps.
synchronous speed750 r/min
- Power range
- 0.18~200kW
- Actual RPM
- 695–745 r/min
- Available Models
- 26a
Synchronous speed: 750 r/min. Features low-speed high torque and low noise, ideal for heavy-duty start-up applications such as large fans, hoists, and extruders.
The number of poles determines the motor's synchronous speed (n = 60f / p, where f is supply frequency and p is pole pairs). At 50Hz: 2-pole = 3000 r/min, 4-pole = 1500 r/min, 6-pole = 1000 r/min, 8-pole = 750 r/min. Actual speed is slightly lower than synchronous speed due to slip. When operating at 60Hz, synchronous speed increases by 20%. To select a model, first determine the required pole count based on load speed, then match power and mounting dimensions to choose the specific type.
Select by Voltage
View rated currents for each voltage- Rated current range
- 0.64~663.4 A
- Override the extreme value bins
- 4-speed
For domestic low-voltage grid standards, 3 kW and below use Y connection, while over 3 kW uses Δ connection, suitable for most factory distribution scenarios.
- Rated current range
- 0.61~630.23 A
- Override the extreme value bins
- 4-speed
Loading product data...
- Rated current range
- 0.59~608.17 A
- Override the extreme value bins
- 4-speed
For certain export projects and specific plant distribution systems, voltage and current values are converted based on the 415V operating condition. Please verify with the power supply system during selection.
- Rated current range
- Convert current based on 380V
- Overwrite Selection Tiers
- Available for all series
Common medium-voltage distribution levels for coal mines and large industrial sites; at the same power level, current is approximately 0.58 times that of 380V systems, reducing cable cross-section and line losses.
- Rated current range
- Convert current based on 380V
- Overwrite Selection Tiers
- Available for all series
Rated current for this voltage condition is listed in the parameter table; verify against your site's power system during selection.
- Rated current range
- Convert current based on 380V
- Overwrite Selection Tiers
- Available for all series
For high-voltage power supply in underground coal mines, select the 660/1140V dual-voltage model. It offers the lowest current at the same power rating, making it ideal for long-distance power transmission.
For the same model, output power, speed, efficiency, power factor, and torque remain constant regardless of voltage; only the rated current is adjusted using I = IN × 380 / U. Dual-voltage motor models (380/660V and 660/1140V) are switched via jumpers in the terminal box. The 1140V model is designed for high-voltage supply in underground coal mines and requires verification that its explosion-proof certification covers the application. Variable frequency drives (VFDs) are categorized by supply voltage; specify the site supply voltage, phase count, and frequency at the time of order.
YFB3 Series High-Efficiency Dust-Exproof Three-Phase Asynchronous Motors: Electrical Performance Parameters (Grouped by Pole Count)
← Swipe left or right to view full parameters; first column is fixed
| Model | Power (kW) | Speed (r/min) | Efficiency (%) | Power Factor | Current 380V(A) | Current 400V(A) | Current 415V(A) | Locked-rotor current Ist/IN | Locked-rotor torque Tst/TN | Maximum Torque TM/TN | Rated Torque (N·m) | Noise Lp dB(A) | Moment of Inertia (kg·m²) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| YFB3-80M1-2 | 0.75 | 2875 | 80.7 | 0.83 | 1.7 | 1.62 | 1.56 | 8.5 | 2.2 | 2.3 | 2.49 | 50 | 0.001 | 21 |
| YFB3-80M2-2 | 1.1 | 2885 | 82.7 | 0.83 | 2.44 | 2.32 | 2.23 | 8.5 | 2.2 | 2.3 | 3.64 | 50 | 0.0014 | 23 |
| YFB3-90S-2 | 1.5 | 2890 | 84.2 | 0.85 | 3.2 | 3.04 | 2.93 | 9 | 2.2 | 2.3 | 4.96 | 55 | 0.0015 | 28 |
| YFB3-90L-2 | 2.2 | 2895 | 85.9 | 0.86 | 4.55 | 4.32 | 4.16 | 9 | 2.2 | 2.3 | 7.3 | 55 | 0.0017 | 33 |
| YFB3-100L-2 | 3 | 2900 | 87.1 | 0.87 | 6.07 | 5.77 | 5.56 | 9.5 | 2.2 | 2.3 | 9.9 | 62 | 0.0055 | 44 |
| YFB3-112M-2 | 4 | 2915 | 88.1 | 0.88 | 7.91 | 7.51 | 7.21 | 9.5 | 2.2 | 2.3 | 13.1 | 65 | 0.0075 | 55 |
| YFB3-132S1-2 | 5.5 | 2925 | 89.2 | 0.88 | 10.7 | 10.2 | 9.8 | 9.5 | 2 | 2.3 | 18 | 67 | 0.015 | 70 |
| YFB3-132S2-2 | 7.5 | 2925 | 90.1 | 0.89 | 14.4 | 13.7 | 13.2 | 9.5 | 2 | 2.3 | 24.5 | 67 | 0.019 | 81 |
| YFB3-160M1-2 | 11 | 2940 | 91.2 | 0.89 | 20.8 | 19.8 | 19.1 | 9.5 | 2 | 2.3 | 35.7 | 68 | 0.05 | 139 |
| YFB3-160M2-2 | 15 | 2940 | 91.9 | 0.89 | 28.1 | 26.7 | 25.7 | 9.5 | 2 | 2.3 | 48.7 | 68 | 0.059 | 153 |
| YFB3-160L-2 | 18.5 | 2940 | 92.4 | 0.89 | 34.5 | 32.8 | 31.6 | 9.5 | 2 | 2.3 | 60 | 68 | 0.069 | 173 |
| YFB3-180M-2 | 22 | 2945 | 92.9 | 0.89 | 40.9 | 38.9 | 37.4 | 9.5 | 2 | 2.3 | 71 | 70 | 0.1 | 219 |
| YFB3-200L1-2 | 30 | 2970 | 93.3 | 0.89 | 55.2 | 52.4 | 50.6 | 9 | 2 | 2.3 | 96 | 71 | 0.2 | 276 |
| YFB3-200L2-2 | 37 | 2970 | 93.7 | 0.89 | 68.4 | 65 | 62.7 | 9 | 2 | 2.3 | 119 | 71 | 0.24 | 305 |
| YFB3-225M-2 | 45 | 2970 | 94 | 0.89 | 82.6 | 78.5 | 75.5 | 9 | 2 | 2.3 | 145 | 73 | 0.39 | 365 |
| YFB3-250M-2 | 55 | 2970 | 94.3 | 0.89 | 100.8 | 95.8 | 92 | 9 | 2 | 2.3 | 177 | 75 | 0.49 | 480 |
| YFB3-280S-2 | 75 | 2980 | 94.7 | 0.9 | 136.4 | 129.6 | 125.2 | 8.5 | 1.8 | 2.3 | 240 | 77 | 0.86 | 618 |
| YFB3-280M-2 | 90 | 2980 | 95 | 0.9 | 162.8 | 154.7 | 149.3 | 8.5 | 1.8 | 2.3 | 288 | 77 | 1.1 | 690 |
| YFB3-315S-2 | 110 | 2985 | 95.2 | 0.9 | 199.4 | 189.4 | 182.8 | 8.5 | 1.8 | 2.3 | 352 | 78 | 1.5 | 1000 |
| YFB3-315M-2 | 132 | 2985 | 95.4 | 0.9 | 238 | 226.1 | 218.2 | 8.5 | 1.8 | 2.3 | 422 | 78 | 1.6 | 1100 |
| YFB3-315L1-2 | 160 | 2985 | 95.6 | 0.9 | 288.8 | 274.4 | 264.8 | 8.5 | 1.8 | 2.2 | 512 | 78 | 2.1 | 1225 |
| YFB3-315L2-2 | 185 | 2985 | 95.7 | 0.9 | 333.4 | 316.7 | 305.6 | 8.5 | 1.8 | 2.2 | 592 | 78 | 2.3 | 1360 |
| YFB3-315L3-2 | 200 | 2985 | 95.8 | 0.9 | 359.8 | 341.8 | 329.8 | 8.5 | 1.8 | 2.2 | 640 | 78 | 2.5 | 1360 |
| YFB3-355M1-2 | 220 | 2990 | 95.9 | 0.91 | 387.2 | 367.8 | 354.9 | 8.5 | 1.6 | 2.2 | 703 | 85 | 4.2 | 1920 |
| YFB3-355M2-2 | 250 | 2990 | 95.9 | 0.91 | 439.6 | 417.6 | 402.9 | 8.5 | 1.6 | 2.2 | 798 | 85 | 4.9 | 2000 |
| YFB3-355L1-2 | 280 | 2990 | 95.9 | 0.91 | 491.8 | 467.2 | 450.8 | 8.5 | 1.6 | 2.2 | 894 | 85 | 4.7 | 2130 |
| YFB3-355L2-2 | 315 | 2990 | 95.9 | 0.91 | 553.2 | 525.5 | 507 | 8.5 | 1.6 | 2.2 | 1006 | 85 | 6 | 2150 |
| YFB3-3551-2 | 355 | 2990 | 95.9 | 0.91 | 623.2 | 592 | 571.2 | 8.6 | 0.9 | 1.8 | 1134 | 89 | 6.8 | 2270 |
| YFB3-3552-2 | 375 | 2990 | 95.9 | 0.91 | 658.4 | 625.5 | 603.5 | 8.6 | 0.9 | 1.8 | 1198 | 89 | 7 | 2290 |
Data in the table is sourced from Wolong's product catalog for the "YFB Series Dust-Explosion-Proof Three-Phase Asynchronous Motors (Frame Size 80–355)", operating at 5 Hz with IE3 energy efficiency class (GB18613-2020, Level 3). Rated currents correspond to 380V, 400V, and 415V. For voltages other than these values, calculate current as I = IN × 380 / U; all other parameters remain unchanged. Efficiency and power factor are provided at 50%, 75%, and 100% loads; the table displays values at 100% load. The noise column lists sound pressure levels Lp in dB(A); moment of inertia is in kg·m². Some models do not specify moment of inertia in the catalog; these are marked with "-" in the table. Please confirm with the manufacturer during selection.
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YFB3 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog (PDF) – Download for full technical specs, installation dimensions, and selection tables.
YFB3 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog
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