YFB4 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous Motors

Explosion-proof motor

Wolong Electric Nanyang Explosion-Proof

YFB4 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous Motors

The YFB4 Series Dust-Exproof Three-Phase Asynchronous Motor (Frame Height 80–355), launched by Wolong Electric Nanyang Ex-proof, is a fully enclosed, self-ventilated, squirrel-cage high-efficiency motor designed for dust-exposed environments. Its efficiency meets the 2 level (IE4) specified in GB18613-2020 "Energy Efficiency Limits and Grades for Small and Medium-Sized Three-Phase Asynchronous Motors." The motor features superior performance, reliable and safe operation, and low vibration and noise levels. Its explosion-proof compliance adheres to GB/T 12476.1 "Electrical Equipment for Use in Flammable Dust Environments – Part 1: General Requirements" and GB 12476.5 "Electrical Equipment for Use in Flammable Dust Environments – Part 5: Enclosure Protection Type 'tD'." It is suitable for explosive dust environments in zones 21 and 22, with an explosion-proof rating of Ex tb IIIC T130℃ Db; it can also be configured as Ex tb IIIB T130℃ Db. Widely used in grain and feed processing, wood manufacturing, metal polishing, coal chemical industry, pharmaceuticals, textiles, port grain handling, and other sectors, this motor drives general-purpose machinery such as fans, compressors, water pumps, crushers, conveyors, and centrifuges. Model Example: YFB4-160L-4 THWF1 - YFB4 denotes the dust-exproof series with IE4 energy efficiency (Level 2 per GB18613-2020). - 160 indicates frame height (mm). - L signifies a long base. - 4 represents the number of poles (4). - Suffix codes indicate environmental ratings: F1 (indoor, moderate corrosion), F2 (indoor, severe corrosion), WF1 (outdoor, moderate corrosion), WF2 (outdoor, severe corrosion), TH (humid tropical), G (high altitude); default is indoor.

Technical Specifications

Housing Number80~355
Rated Power0.18kW~375kW
Efficiency RatingIE4 (GB18613-2020 Level 2 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

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Key Advantages

High Energy Efficiency: Meets 2 class energy efficiency (IE4) per GB18613-2020. Full-load efficiency for 355 frame, 2 pole models reaches up to 96.5%, resulting in lower operating electricity costs.

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: The 8 series model achieves a sound pressure level as low as 40 dB(A) and meets the Class A vibration limits specified in GB 10068.

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

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Ex tb IIIC T130°C Db

Enclosure 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.

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Ex tb IIIB T130°C Db

Explosion-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 level

Explosion-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 Table

2Extreme

Synchronous 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.

4Extreme

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.

6Extrem

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.

8Extreme

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

380V

Rated current range: 0.67~655 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.

400V

Rated current range: 0.63~622 A
Override the extreme value bins: 4-speed

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415V

Rated current range: 0.61~599 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.

660V

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.

690V

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.

1140V

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.

YFB4 Series High-Efficiency Dust-Exproof Three-Phase Asynchronous Motors: Electrical Performance Specifications (Categorized by Pole Count)

Rated Voltage

← 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)
YFB4-80M1-2	0.75	2875	83.5	0.83	1.64	1.56	1.51	8.5	2.2	2.3	2.49	50	0.001	21
YFB4-80M2-2	1.1	2885	85.5	0.83	2.36	2.25	2.16	8.5	2.2	2.3	3.64	50	0.0014	23
YFB4-90S-2	1.5	2890	87.1	0.85	3.1	2.94	2.84	9	2.2	2.3	4.96	55	0.0015	28
YFB4-90L-2	2.2	2895	88.4	0.86	4.42	4.2	4.04	9	2.2	2.3	7.3	55	0.0017	33
YFB4-100L-2	3	2900	89.7	0.87	5.9	5.6	5.4	9.5	2.2	2.3	9.9	62	0.0055	44
YFB4-112M-2	4	2915	90.6	0.88	7.7	7.3	7	9.5	2.2	2.3	13.1	65	0.0075	55
YFB4-132S1-2	5.5	2925	91.2	0.88	10.4	9.9	9.6	9.5	2	2.3	18	67	0.015	70
YFB4-132S2-2	7.5	2925	92.3	0.89	14	13.3	12.8	9.5	2	2.3	24.5	67	0.019	81
YFB4-160M1-2	11	2940	92.9	0.89	20.3	19.3	18.6	9.5	2	2.3	35.7	68	0.05	139
YFB4-160M2-2	15	2940	93.5	0.89	27.4	26.1	25.1	9.5	2	2.3	48.7	68	0.059	153
YFB4-160L-2	18.5	2940	94.1	0.89	33.7	32	30.9	9.5	2	2.3	60	68	0.069	173
YFB4-180M-2	22	2945	94.3	0.89	40	38	36.6	9.5	2	2.3	71	70	0.1	219
YFB4-200L1-2	30	2970	94.5	0.89	54	51	49.6	9	2	2.3	96	71	0.2	276
YFB4-200L2-2	37	2970	94.8	0.89	67	63	61	9	2	2.3	119	71	0.24	305
YFB4-225M-2	45	2970	95	0.89	81	77	74	9	2	2.3	145	73	0.39	365
YFB4-250M-2	55	2970	95.3	0.89	99	94	90	9	2	2.3	177	75	0.49	480
YFB4-280S-2	75	2980	95.6	0.9	134	127	123	8.5	1.8	2.3	240	77	0.86	618
YFB4-280M-2	90	2980	95.8	0.9	160	152	147	8.5	1.8	2.3	288	77	1.1	690
YFB4-315S-2	110	2985	96	0.9	196	186	179	8.5	1.8	2.3	352	78	1.5	1000
YFB4-315M-2	132	2985	96.2	0.9	234	223	214	8.5	1.8	2.3	422	78	1.6	1100
YFB4-315L1-2	160	2985	96.3	0.9	284	269	260	8.5	1.8	2.2	512	78	2.1	1225
YFB4-315L2-2	185	2985	96.4	0.9	328	311	300	8.5	1.8	2.2	592	78	2.3	1360
YFB4-315L3-2	200	2985	96.5	0.9	354	336	324	8.5	1.8	2.2	640	78	2.5	1360
YFB4-355M1-2	220	2990	96.5	0.91	381	362	349	8.5	1.6	2.2	703	85	4.2	1920
YFB4-355M2-2	250	2990	96.5	0.91	433	411	396	8.5	1.6	2.2	798	85	4.9	2000
YFB4-355L1-2	280	2990	96.5	0.91	484	460	444	8.5	1.6	2.2	894	85	4.7	2130
YFB4-355L2-2	315	2990	96.5	0.91	545	518	499	8.5	1.6	2.2	1006	85	6	2150
YFB4-3551-2	355	2990	96.5	0.91	614	583	562	8.6	0.9	1.8	1134	89	6.8	2270
YFB4-3552-2	375	2990	96.5	0.91	649	616	594	8.6	0.9	1.8	1198	89	7	2290

Data in the table are sourced from the Wolong "YFB Series Dust-Explosion-Proof Three-Phase Asynchronous Motor (Frame Size 80~355)" product catalog, under 50Hz operating conditions with IE4 efficiency class (GB18613-2020, Grade 2). Rated currents correspond to three voltage levels: 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 values are provided for 50%, 75%, and 100% loads; the table displays values at 100% load. The noise column shows sound pressure level Lp in dB(A); moment of inertia is in kg·m². Some models do not list moment of inertia in their catalogs, indicated here by "-"; please verify with the manufacturer during selection.

YFB4 Series Motor Shaft Extension Dimensions

← Swipe left or right to view full parameters; first column is fixed

Housing Size	JiShu	D	E	F	GD	G	DB
80	2~8	19j6	40	6	6	15.5	M6×14
90S	2~8	24j6	50	8	7	20	M8×18
90L	2~8	24j6	50	8	7	20	M8×18
100L	2~8	28j6	60	8	7	24	M10×22
112M	2~8	28j6	60	8	7	24	M10×22
132S	2~8	38k6	80	10	8	33	M12×25
132M	2~8	38k6	80	10	8	33	M12×25
160M	2~8	42k6	110	12	8	37	M16×36
160L	2~8	42k6	110	12	8	37	M16×36
180M	2~4	48k6	110	14	9	42.5	M16×36
180L	4~8	48k6	110	14	9	42.5	M16×36
200L	2~8	55m6	110	16	10	49	M20×42
225S	2	55m6	110	16	10	49	M20×42
225S	4~8	60m6	140	18	11	53	M20×42
225M	2	55m6	110	16	10	49	M20×42
225M	4~8	60m6	140	18	11	53	M20×42
250M	2	60m6	140	18	11	53	M20×42
250M	4~8	65m6	140	18	11	58	M20×42
280S	2	65m6	140	18	11	58	M20×42
280S	4~8	75m6	140	20	12	67.5	M20×42
280M	2	65m6	140	18	11	58	M20×42
280M	4~8	75m6	140	20	12	67.5	M20×42
315S	2	65m6	140	18	11	58	M20×42
315S	4~8	80m6	170	22	14	71	M20×42
315M	2	65m6	140	18	11	58	M20×42
315M	4~8	80m6	170	22	14	71	M20×42
315L	2	65m6	140	18	11	58	M20×42
315L	4~8	80m6	170	22	14	71	M20×42
355S	2	75m6	140	20	12	67.5	M24×50
355S	4~8	95m6	170	25	14	86	M24×50
355M	2	75m6	140	20	12	67.5	M24×50
355M	4~8	95m6	170	25	14	86	M24×50
355L	2	75m6	140	20	12	67.5	M24×50
355L	4~8	95m6	170	25	14	86	M24×50

Unit: mm. D = shaft extension diameter (includes fit tolerance), E = shaft extension length, F = key width, GD = key height, G = distance from shaft end to keyway bottom, DB = C-type threaded hole on shaft end face (added per user request; standard motors are shipped with B-type center holes). YFB4 and YFB5 share the same frame series, with identical shaft extensions, mounting feet, and flange dimensions for interchangeable selection.

YFB4 Series B3 (Foot-mounted frame, flangeless end shield) Foot and Overall Dimensions Table

← Swipe left or right to view full parameters; first column is fixed

Housing Size	JiShu	A	B	C	H	K	AA	AB	BB	HA	AC	AD	HD	L	LD
80M	2~8	125	100	50	80	10	34	160	126	10	175	230	275	360	160
90S	2~8	140	100	56	90	10	36	176	151	14	182	230	290	500	176
90L	2~8	140	125	56	90	10	36	176	151	14	182	230	290	500	176
100L	2~8	160	140	63	100	12	40	200	170	15	220	230	310	495	190
112M	2~8	190	140	70	112	12	50	240	180	16	275	235	350	480	210
132S	2~8	216	140	89	132	12	60	276	254	18	310	235	400	580	244
132M	2~8	216	178	89	132	12	60	276	254	18	310	235	400	580	244
160M	2~8	254	210	108	160	15	70	324	314	22	360	235	495	765	296
160L	2~8	254	254	108	160	15	70	324	314	22	360	235	495	765	296
180M	2~4	279	241	121	180	15	70	349	359	23	400	235	535	755	303
180L	4~8	279	279	121	180	15	70	349	359	23	400	235	535	755	303
200L	2~8	318	305	133	200	19	70	388	370	25	450	260	620	770	302
225S	4~8	356	286	149	225	19	75	431	393	28	490	260	665	905	336
225M	2	356	311	149	225	19	75	431	393	28	490	260	665	875	306
225M	4~8	356	311	149	225	19	75	431	393	28	490	260	665	905	336
250M	2~8	406	349	168	250	24	80	490	425	30	535	300	776	925	370
280S	2~8	457	368	190	280	24	85	542	499	35	620	300	835	1110	395
280M	2~8	457	419	190	280	24	85	542	499	35	620	300	835	1110	395
315S	2	508	406	216	315	28	132	640	589	40	690	440	970	1350	451
315S	4~8	508	406	216	315	28	132	640	589	40	690	440	970	1380	481
315M	2	508	457	216	315	28	132	640	589	40	690	440	970	1350	451
315M	4~8	508	457	216	315	28	132	640	589	40	690	440	970	1380	481
315L	2	508	508	216	315	28	132	640	640	40	690	440	970	1450	451
315L	4~8	508	508	216	315	28	132	640	640	40	690	440	970	1480	481
355S	2	610	500	254	355	28	140	740	770	40	790	440	1075	1625	465
355S	4~8	610	500	254	355	28	140	740	770	40	790	440	1075	1695	495
355M	2	610	560	254	355	28	140	740	770	40	790	440	1075	1625	465
355M	4~8	610	560	254	355	28	140	740	770	40	790	440	1075	1695	495
355L	2	610	630	254	355	28	140	740	840	40	790	440	1075	1725	465
355L	4~8	610	630	254	355	28	140	740	840	40	790	440	1075	1795	495

Units in mm. A is the transverse hole spacing of the foot, B is the axial hole spacing of the foot, C is the distance from the shaft extension foot to the end of the frame, H is the center height, K is the foot hole diameter, AA is the terminal box width, AB is the total frame width, BB is the total foot length, HA is the foot thickness, AC is the outer diameter of the frame, AD is the width of the terminal box side, HD is the height from the center to the top, L is the overall length (for other mounting types), and LD is the overall length for V1 mounting. Dimensions for mounting types such as B5, B35, V1, B34, and B14 are detailed in the flange dimension table and product catalog.

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YFB4 Series High-Efficiency Dust-Explosion-Proof Three-Phase Asynchronous MotorProduct Catalog

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Panpu SRM Switched Reluctance Drive System Case Study | Rubber & Plastic Products Factory | Energy-saving Retrofit of Injection Molding Workshop Oil Pumps with Process-Stage Speed Control

The 12 injection molding machines in the rubber and plastic products factory's injection workshop originally used an asynchronous motor + variable pump configuration, resulting in significant energy loss via overflow during the holding pressure and cooling stages. The project has now switched to Panpu SRM switch reluctance motor drive systems for the oil pumps, enabling speed-adjusted oil supply based on process stages.

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