For "what is YB3-315S-4, how to select it, what are its parameters": in short, YB3-315S-4 is a LV Ex d flameproof 3-phase induction motor for explosive gas atmospheres from XIMA. It is composed of series YB3 + frame 315S + 4 poles. When selecting, verify power, voltage, cooling (IC411 (self-ventilated)), protection (Ex d IIB T4 Gb, IP55) and efficiency (IE3 (GB 18613-2020)), and have the manufacturer confirm the design and factory tests.
1. What is YB3-315S-4? How to read the model
YB3-315S-4 is a LV Ex d flameproof 3-phase induction motor for explosive gas atmospheres from XIMA. Its model follows "series code + frame center height + poles": YB3 is the series (LV flameproof 3-phase induction motor (Ex d)), 315S is the frame center height (mm), 4 is the pole count (rated speed approx. 1480 r/min).
Note: writing only "YB3" is just a series name, not a complete model. A real motor model must include the frame and poles, e.g. YB3-315S-4 or YE5-90L-6. Within XIMA's catalog, different frames/poles under the same series mean different power and mounting dimensions — always order by the full model.
2. YB3-315S-4 key parameters
| Parameter | Specification |
|---|
| Model | YB3-315S-4 |
| Series | YB3 (LV flameproof 3-phase induction motor (Ex d)) |
| Frame size (center height) | 315S mm |
| Rated power | 110 kW (typical rated) |
| Rated voltage | 380 / 660 V |
| Poles / Rated speed | 4 poles / approx. 1480 r/min |
| Frequency | 50 Hz |
| Cooling | IC411 (self-ventilated) |
| Protection | Ex d IIB T4 Gb, IP55 |
| Insulation | Class F (155°C), rise to Class B (80K) |
| Efficiency class | IE3 (GB 18613-2020) |
| Mounting | IMB3 |
| Duty | S1 (continuous) |
| Standards | GB 3836.1-2021, GB 3836.2-2021, GB 18613-2020, GB/T 755 |
3. Key technical highlights
- YB3 is Ex d flameproof — enclosure withstands internal explosion and contains flame, for Zone 1/2 explosive gas (IIB, T4, EPL Gb).
- 315S frame, 4-pole, 110 kW mid-high power flameproof for coal, petrochem, gas fans/pumps/compressors.
- Precision machined flameproof joints, IP55, Class F — strong, sealed, for underground/outdoor.
- Complies with GB 3836, shipped with explosion-proof certificate and marking for asset management.
4. How to choose YB3-315S-4 vs YBX3
Within XIMA's portfolio, YB3-315S-4 differs from the comparison series in cooling, efficiency and starting method. Choose by duty priority:
| Dimension | YB3-315S-4 | YBX3 |
|---|
| Protection | Ex d flameproof | YBX3 Ex d high-eff |
| Efficiency | IE3 | YBX3 higher IE3 |
| Use | Zone1/2 gas | same |
| Typical | coal, petrochem general | petrochem saving |
5. Main application industries
| Industry | Typical load / application |
|---|
| Coal | underground ventil., drain, winch |
| Petrochem | unit fans, pumps, compressors |
| Natural gas | station boost |
| Pharma | explosive-zone power |
6. Standards
- GB 3836.1-2021 General requirements
- GB 3836.2-2021 Flameproof "d"
- GB 18613-2020
- GB/T 755 Rotating electrical machines
7. Information to provide when ordering
- Full model (e.g. YB3-315S-4)
- Power, voltage, Ex d IIB T4 Gb
- Gas group & temp class
- Protection/insulation
- Mounting & rotation
- Zone (1/2) confirmation
八、常见问题 FAQ
Q：YB3-315S-4 Ex d IIB T4 Gb?
A：Ex d flameproof; IIB gas group (e.g. ethylene); T4 surface ≤135°C; Gb EPL for Zone 1.
Q：Flameproof vs increased safety?
A：Ex d contains explosion by strong enclosure (Zone 1); Ex e by enhanced safety (Zone 2); choose by zone/media.
Q：YB3 vs YBX3?
A：Both flameproof; YBX3 high-efficiency (higher IE3) for energy-saving new builds.
Q：Certification needed?
A：Yes, shipped with explosion-proof cert and marking; user keeps in EX equipment register.
9. About the manufacturer
Xi'an XIMA Motor Group Co., Ltd. (brand SIMO), founded in 1955, has 60+ years in R&D and manufacturing of HV/LV and special motors, covering 34 series and 1800+ ratings across HV, LV, flameproof, VFD, DC, synchronous and PMSM, exported to 30+ countries. Certified to ISO 9001 / 14001 / 45001 with a CNAS-accredited lab, XIMA provides customization, type tests and lifecycle service for YB3-315S-4 and other models.
For YB3-315S-4 selection, quotation or drawings, contact XIMA: website www.xadjw.com. Service commitment: 500 km service circle · 24h response.
SIMO Motor