Explosion-proof motor
Wolong Electric Nanyang Explosion-ProofYBX4 Series High-Efficiency Explosion-Proof Three-Phase Asynchronous Motor
The YBX4 series high-efficiency explosion-proof three-phase asynchronous motor is a next-generation product jointly developed by Chinese and German engineering teams. It incorporates European expertise in explosion-proof motor design, features an updated aesthetic, enhances safety performance, and expands the range of explosion-proof classifications. The product complies with Chinese explosion-proof standards GB 3836.1 and GB 3836.2. Motor performance meets T/CEEIA 269-2017 "Technical Specifications for YBX4 Series High-Efficiency Explosion-Proof Three-Phase Asynchronous Motors (Frame Sizes 63-355)" from the China Electrical Equipment Industry Association. Efficiency aligns with the 2-level energy efficiency standard outlined in GB18613-2020. Mounting dimensions adhere to IEC and national standards, enabling rapid customer substitution. The d-type explosion-proof enclosure can withstand internal explosions caused by flammable gas mixtures entering through any joint or structural gap without damage, and prevents ignition of external explosive atmospheres. Key advantages include a spacious terminal box, enhanced safety and reliability, increased capacity, and professional industrial design. Widely used in hazardous environments such as oil & gas, chemical processing, coal mining, metallurgy, power generation, and ports where explosive gas mixtures may be present.
Technical Specifications
- Housing Number80~355
- Rated Power0.37kW~375kW
- Efficiency RatingGB8613-2020 Level 2
- Jisu2P, 4P, 6P, 8P (Optional 10P, 12P, 14P, 16P)
- Rated Voltage380V, 660V, 380/660V (other voltages available on request)
- Rated Frequency50Hz (optional 60Hz)
- Working ModeS1 (optional S2–S0)
- Ambient Temperature-20°C to +40°C (customizable for temperatures up to 60°C and down to -40°C)
- AltitudeUp to 1000m (other altitudes available upon request)
- HumidityMonthly average maximum relative humidity shall not exceed 90%.
- Installation MethodB3, B5, B35, V1 (optional: B14, B34, V6, etc.)
- junction boxLocated at the top of the motor, with the cable outlet on the right side when viewed from the shaft extension end. Supports 90° rotation (horizontal left or horizontal right selectable).
- Inlet ConfigurationBell mouth (optional threaded port or gland structure)
- Number of Inlets80~280 single-port, 315, 355 dual-port (200~280 optional dual-port)
- Cable Fixing MethodOT-type terminal block (optional lock nut)
- Ingress Protection RatingIP55 (Optional: IP66, IP56, IP65)
- Insulation ClassClass F (H-class optional)
- Cooling MethodIC411
- Spline keyType B Key (Type A Key Optional)
- bearing132 and below are sealed bearings; 160 and above are open bearings (160~280 available as sealed options). Clearance: C3 (C4, C5, CX optional).
- Wiring method3kW and below: 380V Y connection; motors above 3kW: 380V △ connection
- FanAnti-static Plastic Fan (Cast Aluminum Fan Optional)
- Rotation DirectionClockwise when viewed from the shaft end (can be adjusted to counterclockwise)
- Explosion-proof markingEx d I Mb, Ex d IIB T4 Gb, Ex d IIC T4 Gb
- Explosion-proof CertificateCNEx20.0320X, Standard Number Q/NF215.7-2021
- Design Reference StandardsGB 3836.1, GB 3836.2, GB 3836.3, GB 50058, GB/T 14711, GB 18613, GB/T 1032, GB/T 755, GB/T 997, GB/T 4942.1, GB 10068, GB/T 10069, and IEC 60079-0/1/7, IEC 60034-1/30-1/2-1/5/7/9/14, IEC 60072-1
Key Advantages
Full explosion-proof certification: Ex d flameproof protection covering Ex d I Mb, Ex d IIB T4 Gb, and Ex d IIC T4 Gb. Suitable for non-mining areas in coal mines and explosive gas environments in industrial facilities.
High Efficiency & Energy Saving: Meets energy efficiency level 2 per GB18613-2020, with full-load efficiency reaching 96.5% for frame size 315 and pole count 2.
Jointly developed by China and Germany: Incorporating European explosion-proof motor design heritage, featuring a brand-new aesthetic with simultaneous improvements in safety performance and capacity.
Large junction box capacity: Ample space for cable entry, making wiring and maintenance easier. Available with 80~280 single-port or 315/355 dual-port options.
Interchangeable installation: Dimensions comply with IEC and national standards for quick replacement of legacy explosion-proof motors.
Wide pole coverage: Standard 2/4/6/8 poles, optional 10/12/14/16 poles to meet low-speed, high-torque applications.
Flexible structural configuration: Multiple mounting options including B3, B5, B35, and V1; IP rating, insulation class, and bearing clearance available to suit your requirements.
Status monitoring: Optional PTC stator temperature sensing (80~355) and PT100 independent temperature sensor junction box (160~355), bearing temperature monitoring, and anti-condensation heating tape.
Environmentally adaptable: Available for outdoor, anti-corrosion, wet tropical, and dry tropical environments. Topcoat color is customizable.
Use Cases
petroleum refining unit
Chemical Process Pumps and Compressors
Non-mining and non-excavation work areas in underground coal mines
Metallurgical Rolling and Dust Removal Fans
Auxiliary Drive Systems for the Power Industry
Port Terminal Conveying Equipment
Natural Gas Processing and Transportation
Explosion Protection Rating Explanation
View All Explosion-Proof MotorsExplosion-proof for underground coal mines
Suitable for locations such as underground coal mine areas other than mining and excavation faces where explosive methane gas atmospheres exist. "Mb" indicates a higher level of protection.
Filter products at this levelFactory IIB Flameproof
Suitable for IIB flammable gas environments such as ethylene and coke oven gas. T4 indicates the equipment's maximum surface temperature does not exceed 135°C; Gb denotes a high level of protection.
Filter products at this levelFactory-rated, IIC explosion-proof
Suitable for IIC explosive gas environments including hydrogen, acetylene, and carbon disulfide; covers all IIA and IIB gas groups for broader protection.
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 RPM
- Power range
- 0.75~355kW
- Actual RPM
- 2882–2990 r/min
- Available Models
- 30a
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 RPM
- Power range
- 0.55~375kW
- Actual RPM
- 1447–1493 r/min
- Available Models
- 32a
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 RPM
- Power range
- 0.37~315kW
- Actual RPM
- 926–995 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 RPM
- Power range
- 0.18~250kW
- Actual RPM
- 695–746 r/min
- Available Models
- 29a
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
- 0.67~644 A
- Override power levels
- 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
- 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.
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.
YBX4 Series High-Efficiency Explosion-Proof Three-Phase Asynchronous Motor Electrical Performance Parameters (Grouped by Pole Count)
← Swipe left or right to view full parameters; first column is fixed
| Model | Power (kW) | Rated current 380V(A) | Speed (r/min) | Efficiency 100% Load (%) | Power Factor 100% Load | Rated Torque (N·m) | Locked-rotor current Ist/IN | Locked-rotor torque Tst/TN | Maximum Torque TM/TN | Noise Sound Power Lw dB(A) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| YBX4-80M1-2 | 0.75 | 1.6 | 2895 | 83.5 | 0.83 | 2.5 | 7 | 2.3 | 2.3 | 62 | 30 |
| YBX4-80M2-2 | 1.1 | 2.4 | 2882 | 85.2 | 0.83 | 3.6 | 7 | 2.3 | 2.3 | 62 | 35 |
| YBX4-90S-2 | 1.5 | 3.1 | 2910 | 86.5 | 0.85 | 4.9 | 7 | 2.3 | 2.3 | 67 | 46 |
| YBX4-90L-2 | 2.2 | 4.4 | 2914 | 88 | 0.86 | 7.2 | 8 | 2.3 | 2.3 | 67 | 63 |
| YBX4-100L-2 | 3 | 5.9 | 2905 | 89.1 | 0.87 | 9.9 | 7 | 2.3 | 2.3 | 74 | 69 |
| YBX4-112M-2 | 4 | 7.7 | 2926 | 90 | 0.88 | 13.1 | 8.5 | 2.3 | 2.3 | 77 | 70 |
| YBX4-132S1-2 | 5.5 | 10.4 | 2936 | 90.9 | 0.88 | 17.9 | 8 | 2.2 | 2.3 | 79 | 107 |
| YBX4-132S2-2 | 7.5 | 14 | 2928 | 91.7 | 0.88 | 24.5 | 8 | 2.2 | 2.3 | 79 | 130 |
| YBX4-160M1-2 | 11 | 20.3 | 2945 | 92.6 | 0.88 | 35.7 | 7 | 2.2 | 2.3 | 81 | 179 |
| YBX4-160M2-2 | 15 | 27.4 | 2945 | 93.3 | 0.89 | 48.6 | 8 | 2.2 | 2.3 | 81 | 214 |
| YBX4-160L-2 | 18.5 | 33.7 | 2954 | 93.7 | 0.89 | 59.8 | 8 | 2.2 | 2.3 | 81 | 277 |
| YBX4-180M-2 | 22 | 40 | 2964 | 94 | 0.89 | 70.9 | 7 | 2.2 | 2.3 | 83 | 364 |
| YBX4-200L1-2 | 30 | 54 | 2974 | 94.5 | 0.88 | 96 | 8 | 2.2 | 2.3 | 84 | 456 |
| YBX4-200L2-2 | 37 | 67 | 2973 | 94.8 | 0.89 | 119 | 9 | 2.2 | 2.3 | 84 | 490 |
| YBX4-225M-2 | 45 | 81 | 2978 | 95 | 0.89 | 144 | 8 | 2.2 | 2.3 | 86 | 537 |
| YBX4-250M-2 | 55 | 99 | 2980 | 95.3 | 0.89 | 176 | 7 | 2.2 | 2.3 | 89 | 811 |
| YBX4-280S-2 | 75 | 134 | 2981 | 95.6 | 0.89 | 240 | 7 | 2 | 2.3 | 91 | 1302 |
| YBX4-280M-2 | 90 | 160 | 2980 | 95.8 | 0.89 | 288 | 7 | 2 | 2.3 | 91 | 1281 |
| YBX4-315S-2 | 110 | 193 | 2980 | 96 | 0.89 | 353 | 7 | 1.9 | 2.2 | 92 | 1544 |
| YBX4-315M-2 | 132 | 232 | 2980 | 96.2 | 0.89 | 423 | 7.5 | 1.9 | 2.2 | 92 | 1681 |
| YBX4-315L1-2 | 160 | 275 | 2981 | 96.3 | 0.89 | 513 | 7.5 | 1.9 | 2.2 | 92 | 2049 |
| YBX4-315L-2 | 185 | 325 | 2983 | 96.4 | 0.89 | 592 | 7.5 | 1.9 | 2.2 | 92 | 2188 |
| YBX4-315L2-2 | 200 | 340 | 2981 | 96.5 | 0.89 | 641 | 7 | 1.9 | 2.2 | 92 | 1806 |
| YBX4-355S1-2 | 185 | 315 | 2989 | 96.4 | 0.89 | 591 | 7 | 1.9 | 2.2 | 100 | 2770 |
| YBX4-355S2-2 | 200 | 347 | 2988 | 96.5 | 0.89 | 639 | 7 | 1.9 | 2.2 | 100 | 2217 |
| YBX4-355M1-2 | 220 | 380 | 2990 | 96.5 | 0.89 | 703 | 7 | 1.8 | 2.2 | 104 | 2739 |
| YBX4-355M2-2 | 250 | 435 | 2988 | 96.5 | 0.9 | 799 | 7 | 1.8 | 2.2 | 104 | 2380 |
| YBX4-355L1-2 | 280 | 485 | 2987 | 96.5 | 0.9 | 895 | 7 | 1.8 | 2.2 | 104 | 2485 |
| YBX4-355L2-2 | 315 | 541 | 2989 | 96.5 | 0.9 | 1006 | 7 | 1.8 | 2.2 | 104 | 2685 |
| YBX4-355LX1-2 | 355 | 607 | 2988 | 96.5 | 0.9 | 1134 | 8.6 | 1.8 | 2.2 | 104 | 2500 |
Data in the table is sourced from Wolong's product catalog for the YBX4 Series High-Efficiency Low-Voltage Explosion-Proof Three-Phase Asynchronous Motors, under 50Hz and 380V operating conditions. When voltage U is not 380V, current I = IN × 380 / U; all other parameters remain unchanged. Noise values correspond to 50Hz conditions. For motors with rated frequency 60Hz, frame sizes 200~355 add 6dB(A) to the no-load noise for 2-pole models, while all other pole counts add 5dB(A).
YBX4 Series B3 Type (Foot-mounted, End Cover without Flange) Installation and Dimensional Specifications Table
← Swipe left or right to view full parameters; first column is fixed
| Housing Size | JiShu | A | B | C | D | E | F | G | H | K | AA | AB | BB | HA | AC | HD | L |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 80M | 2~8 | 125 | 100 | 50 | 19 | 40 | 6 | 15.5 | 80 | 10 | 32 | 157 | 160 | 10 | 162 | 285 | 360 |
| 90S | 2~8 | 140 | 100 | 56 | 24 | 50 | 8 | 20 | 90 | 10 | 37 | 172 | 164 | 12 | 175 | 300 | 396 |
| 90L | 2~8 | 140 | 125 | 56 | 24 | 50 | 8 | 20 | 90 | 10 | 37 | 172 | 200 | 12 | 175 | 300 | 426 |
| 100L | 2~8 | 160 | 140 | 63 | 28 | 60 | 8 | 24 | 100 | 12 | 45 | 200 | 215 | 15 | 212 | 320 | 460 |
| 112M | 2~8 | 190 | 140 | 70 | 28 | 60 | 8 | 24 | 112 | 12 | 45 | 228 | 210 | 15 | 225 | 360 | 495 |
| 132S | 2~8 | 216 | 140 | 89 | 38 | 80 | 10 | 33 | 132 | 12 | 57 | 262 | 230 | 18 | 249 | 390 | 545 |
| 132M | 2~8 | 216 | 178 | 89 | 38 | 80 | 10 | 33 | 132 | 12 | 57 | 262 | 285 | 18 | 249 | 390 | 600 |
| 160M | 2~8 | 254 | 210 | 108 | 42 | 110 | 12 | 37 | 160 | 14.5 | 65 | 314 | 320 | 20 | 315 | 470 | 715 |
| 160L | 2~8 | 254 | 254 | 108 | 42 | 110 | 12 | 37 | 160 | 14.5 | 65 | 314 | 380 | 20 | 315 | 470 | 770 |
| 180M | 2~8 | 279 | 279 | 121 | 48 | 110 | 14 | 42.5 | 180 | 14.5 | 68 | 349 | 350 | 22 | 358 | 530 | 745 |
Fits frame sizes 80~180 (2~8 poles), unit: mm. A = horizontal distance between foot holes, A/2 = distance from center to foot edge, B = axial distance between foot holes, C = distance from shaft extension end of foot to frame end, D = shaft extension diameter, E = shaft extension length, F = key width, G = distance from shaft extension end to keyway bottom, H = center height, K = foot hole diameter, AA = terminal box width, AB = total frame width, BB = total foot length, HA = foot thickness, AC = outer diameter of frame, HD = height from center to top, L = overall length. For dimensions of other frame sizes and mounting types B5, B35, V1, B34, and B14, refer to the product catalog.
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YBX4 Series High-Efficiency Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog (PDF) – Download for full technical specs, installation dimensions, and selection tables.
YBX4 Series High-Efficiency Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog
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