{"id":142,"date":"2026-07-08T08:38:12","date_gmt":"2026-07-08T08:38:12","guid":{"rendered":"https:\/\/industrialelectricmotor.net\/?post_type=product&p=142"},"modified":"2026-07-08T08:38:12","modified_gmt":"2026-07-08T08:38:12","slug":"yb2-series-6-pole-explosion-proof-motor","status":"publish","type":"product","link":"https:\/\/industrialelectricmotor.net\/ko\/product\/yb2-series-6-pole-explosion-proof-motor\/","title":{"rendered":"YB2 Series 6-Pole Explosion-Proof Motor"},"content":{"rendered":"
\n
\n
Ex d Flameproof<\/div>\n
Group IIB T4<\/div>\n
6-Pole 960 rpm<\/div>\n
IP55 Protection<\/div>\n
IEC 60079-1<\/div>\n
ISO 9001 Certified<\/div>\n<\/div>\n
\n
\"YB2
\n\"YB2<\/div>\n
\n

Slow-Speed Flameproof Motor for Classified Mixer and Fan Drives<\/h2>\n

The 6-pole YB2 operates at approximately 960 rpm, producing 50% more shaft torque than a 4-pole motor of the same power rating and frame size. In hazardous areas, this torque advantage has a specific practical benefit: it allows the motor to be coupled directly to the driven equipment through a single-stage reduction, eliminating a gearbox unit from inside the classified zone. Each additional mechanical component inside a Zone 1 boundary requires its own maintenance inspection and represents another potential ignition source or fluid leak; removing the gearbox entirely simplifies the safety case for the complete drive assembly.<\/p>\n

The flameproof enclosure design and flame path machining follow the same IEC 60079-1 specifications as all other YB2 pole variants. The 6-pole frame runs at a lower surface temperature at full load than a 4-pole motor of the same frame at the same power, because the lower shaft speed reduces windage losses and mechanical friction in the bearings and shaft seal, both of which generate surface heat. This additional thermal margin gives the 6-pole motor a more comfortable compliance band below the T4 surface temperature limit of 135 \u00b0C.<\/p>\n

Frame sizes cover 90S through 315M (1.1 kW to 132 kW). All units carry IP55 protection, Class F insulation with Class B temperature-rise limits, and CE plus Ex marking. Cast-iron construction throughout all frame sizes provides the wall thickness required for certified flame path geometry.<\/p>\n

Browse the complete Ex motor range on the Explosion-Proof Motors<\/a> page, or compare matched non-hazardous motors in the Three-Phase Induction Motors<\/a> section.<\/p>\n<\/div>\n<\/div>\n

YB2 6-Pole Model Specifications \u2014 Ex d IIB T4<\/h2>\n

All models: 6-pole, ~960 rpm, 380 V 50 Hz, IP55, Class F insulation, Ex d IIB T4, Zone 1 and Zone 2.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/th>\nFrame<\/th>\nkW<\/th>\nFull-Load A<\/th>\nrpm<\/th>\n\u03b7 %<\/th>\ncos\u03c6<\/th>\nTst\/Tn<\/th>\nIst\/In<\/th>\nkg<\/th>\n<\/tr>\n<\/thead>\n
YB2-90S-6<\/td>\n90S<\/td>\n1.1<\/td>\n3.54<\/td>\n910<\/td>\n68.0<\/td>\n0.70<\/td>\n2.0<\/td>\n5.5<\/td>\n32<\/td>\n<\/tr>\n
YB2-90L-6<\/td>\n90L<\/td>\n1.5<\/td>\n4.60<\/td>\n920<\/td>\n70.0<\/td>\n0.71<\/td>\n2.0<\/td>\n5.5<\/td>\n40<\/td>\n<\/tr>\n
YB2-100L-6<\/td>\n100L<\/td>\n2.2<\/td>\n6.28<\/td>\n930<\/td>\n73.0<\/td>\n0.72<\/td>\n2.0<\/td>\n5.5<\/td>\n52<\/td>\n<\/tr>\n
YB2-112M-6<\/td>\n112M<\/td>\n3.0<\/td>\n8.28<\/td>\n940<\/td>\n75.5<\/td>\n0.73<\/td>\n2.0<\/td>\n6.0<\/td>\n74<\/td>\n<\/tr>\n
YB2-132S-6<\/td>\n132S<\/td>\n4.0<\/td>\n10.78<\/td>\n945<\/td>\n77.0<\/td>\n0.74<\/td>\n2.0<\/td>\n6.0<\/td>\n96<\/td>\n<\/tr>\n
YB2-132M1-6<\/td>\n132M<\/td>\n5.5<\/td>\n14.36<\/td>\n948<\/td>\n79.5<\/td>\n0.74<\/td>\n2.0<\/td>\n6.0<\/td>\n124<\/td>\n<\/tr>\n
YB2-132M2-6<\/td>\n132M<\/td>\n7.5<\/td>\n19.10<\/td>\n950<\/td>\n81.0<\/td>\n0.75<\/td>\n2.0<\/td>\n6.0<\/td>\n142<\/td>\n<\/tr>\n
YB2-160M-6<\/td>\n160M<\/td>\n11<\/td>\n27.00<\/td>\n955<\/td>\n83.5<\/td>\n0.76<\/td>\n2.0<\/td>\n6.5<\/td>\n175<\/td>\n<\/tr>\n
YB2-160L-6<\/td>\n160L<\/td>\n15<\/td>\n36.50<\/td>\n958<\/td>\n85.0<\/td>\n0.77<\/td>\n2.0<\/td>\n6.5<\/td>\n208<\/td>\n<\/tr>\n
YB2-180L-6<\/td>\n180L<\/td>\n18.5<\/td>\n44.50<\/td>\n960<\/td>\n86.5<\/td>\n0.78<\/td>\n2.0<\/td>\n6.5<\/td>\n258<\/td>\n<\/tr>\n
YB2-200L1-6<\/td>\n200L<\/td>\n22<\/td>\n52.60<\/td>\n962<\/td>\n87.5<\/td>\n0.79<\/td>\n2.0<\/td>\n6.5<\/td>\n322<\/td>\n<\/tr>\n
YB2-200L2-6<\/td>\n200L<\/td>\n30<\/td>\n70.80<\/td>\n964<\/td>\n88.5<\/td>\n0.80<\/td>\n1.8<\/td>\n6.5<\/td>\n368<\/td>\n<\/tr>\n
YB2-225M-6<\/td>\n225M<\/td>\n37<\/td>\n86.50<\/td>\n966<\/td>\n89.5<\/td>\n0.80<\/td>\n1.8<\/td>\n6.5<\/td>\n450<\/td>\n<\/tr>\n
YB2-250M-6<\/td>\n250M<\/td>\n55<\/td>\n126.00<\/td>\n968<\/td>\n90.5<\/td>\n0.81<\/td>\n1.8<\/td>\n6.5<\/td>\n575<\/td>\n<\/tr>\n
YB2-280S-6<\/td>\n280S<\/td>\n75<\/td>\n170.00<\/td>\n970<\/td>\n91.5<\/td>\n0.82<\/td>\n1.8<\/td>\n6.5<\/td>\n728<\/td>\n<\/tr>\n
YB2-315S-6<\/td>\n315S<\/td>\n90<\/td>\n202.00<\/td>\n972<\/td>\n92.0<\/td>\n0.82<\/td>\n1.8<\/td>\n6.5<\/td>\n895<\/td>\n<\/tr>\n
YB2-315M-6<\/td>\n315M<\/td>\n132<\/td>\n294.00<\/td>\n974<\/td>\n92.5<\/td>\n0.83<\/td>\n1.8<\/td>\n6.5<\/td>\n1100<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n
\n

Operating Conditions<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
Ambient temperature<\/td>\n\u221220 \u00b0C to +40 \u00b0C<\/td>\n<\/tr>\n
Altitude<\/td>\n\u2264 1000 m ASL<\/td>\n<\/tr>\n
Supply voltage<\/td>\n380 V \u00b1 5%<\/td>\n<\/tr>\n
Frequency<\/td>\n50 Hz \u00b1 1%<\/td>\n<\/tr>\n
Mounting<\/td>\nIMB3 \/ IMB5 \/ IMB35<\/td>\n<\/tr>\n
Protection<\/td>\nIP55<\/td>\n<\/tr>\n
Insulation class<\/td>\nClass F<\/td>\n<\/tr>\n
Temperature rise<\/td>\nClass B limit<\/td>\n<\/tr>\n
Max surface temp<\/td>\n135 \u00b0C (T4)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

Hazardous Area Certification<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Protection method<\/td>\nEx d (flameproof)<\/td>\n<\/tr>\n
Gas group<\/td>\nIIB<\/td>\n<\/tr>\n
Temperature class<\/td>\nT4 (135 \u00b0C max)<\/td>\n<\/tr>\n
Zone suitability<\/td>\nZone 1, Zone 2<\/td>\n<\/tr>\n
Ex standard<\/td>\nIEC 60079-1<\/td>\n<\/tr>\n
Motor standard<\/td>\nIEC 60034<\/td>\n<\/tr>\n
Quality management<\/td>\nISO 9001<\/td>\n<\/tr>\n
Marking<\/td>\nCE \/ Ex<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Typical Applications for YB2 6-Pole Explosion-Proof Motors<\/h2>\n\n\n\n
\"YB2<\/p>\n
\n
Classified Zone Agitators<\/div>\n
Side-entry and top-entry agitators on storage tanks and reaction vessels in Zone 1 classified areas use 6-pole Ex d motors for their high torque at low speed, avoiding the need for a gearbox inside the hazardous zone and reducing the total component count requiring Ex certification.<\/div>\n<\/div>\n<\/td>\n
\"YB2<\/p>\n
\n
Large-Diameter Hazardous Fans<\/div>\n
Large-diameter axial and centrifugal fans for classified area ventilation at 960 rpm use the 6-pole YB2 to achieve the fan tip speed required for efficient airflow without belt or gear drive, simplifying the installation inside the classified zone boundary.<\/div>\n<\/div>\n<\/td>\n
\"YB2<\/p>\n
\n
Mining Zone 1 Drives<\/div>\n
Coal preparation plant conveyors and underground mine auxiliary equipment in Zone 1 methane-classified areas use 6-pole Ex d IIB motors. IIB certification covers methane (Group IIA by upward compatibility) with margin, satisfying the typical mine electrical safety specification.<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
\n
\n
\ud83c\udfed<\/div>\n
Paint Booth Exhaust<\/div>\n
Exhaust plenum fan motors in automotive paint booths classified Zone 1 for solvent vapours use 6-pole Ex d IIB T4 motors to drive large-diameter low-pressure fans at 960 rpm, providing the required air change rate without excessive noise from high blade tip speeds.<\/div>\n<\/div>\n<\/td>\n
\n
\n
\ud83d\udd25<\/div>\n
Flare Gas Compressors<\/div>\n
Low-pressure flare gas recovery screw compressors at refineries and chemical plants operate in Zone 1 areas and require Ex d IIB motors at moderate speed. The 6-pole motor at 960 rpm is commonly used with a belt drive to match the compressor rotor speed in this duty.<\/div>\n<\/div>\n<\/td>\n
\n
\n
\u2693<\/div>\n
Ballast Water Pumps<\/div>\n
Ballast water pump motors in the classified cargo hold areas of chemical tankers and LNG carriers must carry Ex d certification. The 6-pole motor provides the torque needed for large-bore low-speed ballast pumps without the space penalty of a gearbox between motor and pump casing.<\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

Thermal Advantage of Lower Speed in Ex d Motor Design<\/h2>\n
\n
\n

T4 Compliance Margin<\/h3>\n

The T4 temperature class limits the maximum surface temperature of the motor to 135 \u00b0C under any operating condition. A 6-pole motor at 960 rpm generates less windage heat and lower bearing friction losses than a 4-pole motor at 1460 rpm or a 2-pole motor at 2900 rpm at the same rated power. This lower mechanical heat generation means the 6-pole motor has a wider margin below the 135 \u00b0C T4 ceiling at full rated load in maximum ambient temperature, making T4 compliance easier to maintain under overload conditions and in ambient temperatures approaching 40 \u00b0C.<\/p>\n<\/div>\n

\n

Shaft Seal Integrity at Lower Speed<\/h3>\n

The flameproof shaft seals at both ends of the motor are critical flame path elements. Seal lip wear rate increases with shaft surface speed; at 960 rpm, the shaft surface speed through the seal contact zone is approximately 34% of the speed at 2900 rpm. Reduced wear means the certified seal gap dimension is maintained for longer, extending the period between mandatory seal inspections and replacements. This is a meaningful maintenance cost saving in hazardous areas where even seal inspection requires a hot-work permit and area isolation in Zone 1.<\/p>\n<\/div>\n

\n

Noise and Vibration in Classified Areas<\/h3>\n

Ex d motors operating in classified areas are often located adjacent to gas detectors, pressure relief valves, and instrumentation that is sensitive to vibration. The 6-pole motor at 960 rpm produces substantially lower vibration than a 4-pole or 2-pole motor at the same power because both the unbalance force and the aerodynamic fan noise scale with speed. Reduced vibration lowers the transmitted force to flanges and pipework connected to motor-driven pumps, reducing the risk of fatigue failure at pipe joints \u2014 which would themselves generate an unplanned flammable release.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
\"Korea<\/p>\n
Rotor Production Line<\/div>\n<\/div>\n
\"Korea<\/p>\n
Precision Flame-Path Machining<\/div>\n<\/div>\n
\"Korea<\/p>\n
Engineering Team<\/div>\n<\/div>\n
\"Korea<\/p>\n
Ex and ISO Certifications<\/div>\n<\/div>\n<\/div>\n<\/div>\n

Frequently Asked Questions \u2014 YB2 Series 6-Pole Explosion-Proof Motor<\/h2>\n
\n
\n
Can gearboxes be installed inside Zone 1 hazardous areas with an Ex d motor?<\/div>\n
Mechanical gearboxes are not themselves required to carry Ex certification in most IEC 60079-10 zone classification schemes, because a non-sparking mechanical transmission is not considered an ignition source in normal operation. However, gearboxes introduce oil seals that can leak flammable oil into the classified area, coupling guards that trap vapour, and additional maintenance access points. Many plant safety cases prefer to eliminate gearboxes from Zone 1 areas where the motor pole count can be changed to match the load speed directly, which is a key driver for specifying the 6-pole YB2 instead of a 4-pole motor with reduction gear in agitator and fan applications.<\/div>\n<\/div>\n
\n
What is the minimum ambient temperature rating for the YB2 6-pole?<\/div>\n
The YB2 6-pole is rated for ambient temperatures from \u221220 \u00b0C to +40 \u00b0C as standard. The lower limit of \u221220 \u00b0C is more conservative than the \u221215 \u00b0C rating of the standard Y2 series, reflecting the need for reliable operation in outdoor classified areas at northern European and cold-climate LNG terminal installations. For applications requiring operation below \u221220 \u00b0C, low-temperature variants with cold-rated lubricants and low-temperature winding insulation compound are available on request.<\/div>\n<\/div>\n
\n
Does the YB2 6-pole carry a separate dust explosion certification?<\/div>\n
The standard YB2 6-pole carries Ex d IIB T4 certification for flammable gas and vapour atmospheres (Zone 1 and Zone 2). Certification for combustible dust atmospheres (Zone 20, 21, and 22 under IEC 60079-31, or Ex t protection method) is a different certification and requires testing to a different standard. Korea Ever-Power can supply the YB2 with combined gas and dust certification (Ex d IIB T4 \/ Ex t IIIB T135 or similar) as a factory option for dual-hazard installations such as grain handling facilities where both flammable vapour and combustible dust may be present. Specify the required dust group and temperature class when ordering.<\/div>\n<\/div>\n
\n
What earthing arrangements are required for the YB2 in a classified area?<\/div>\n
IEC 60079-14 requires that all electrical equipment in hazardous areas is bonded to the facility earthing system. The YB2 motor has two earthing points: an internal earth terminal in the terminal box (for connection of the supply cable earth conductor) and an external earth boss on the motor frame (for connection of an equipotential bonding conductor to the plant earthing grid). Both must be used in Zone 1 installations. The earthing conductor cross-section must be sized to carry the maximum earth fault current of the circuit and must be visible and accessible for inspection without disturbing the motor or its connections.<\/div>\n<\/div>\n
\n
Is direct-on-line starting permitted for large-frame YB2 6-pole motors in Zone 1?<\/div>\n
Direct-on-line starting is permitted for all YB2 6-pole frame sizes as far as the motor certification is concerned. The supply system capacity must be sufficient to support the starting current without causing voltage dips that trip other equipment in the facility. For frame sizes above 200L where starting current may exceed 400 A, star-delta starting or a soft-starter located outside the classified zone boundary (with the motor cable entering the zone through an appropriate cable entry fitting) is typically used to limit supply disturbance. Any soft-starter or star-delta panel must be located outside the Zone 1 boundary or must itself be Ex certified if located inside.<\/div>\n<\/div>\n
\n
What bearing type and lubrication is used in the 6-pole YB2 for extended service?<\/div>\n
Frame sizes up to 160L use deep-groove ball bearings at both ends with NLGI 2 lithium-based grease as standard. Frame sizes from 180L upward use a roller bearing on the drive end and a ball bearing on the non-drive end, to accommodate the higher radial loads from direct-coupled agitator shaft bending moments and belt drive loads. External grease nipples are standard on frame sizes 160L and above, allowing the bearings to be regreased in service without dismounting the motor. The grease nipple is located to ensure new grease purges old grease through the relief port rather than through the flame path seal, maintaining Ex certification integrity during regreasing.<\/div>\n<\/div>\n<\/div>\n
\n

Request a Quote for YB2 6-Pole Explosion-Proof Motors<\/h2>\n

Specify power (kW), zone, gas group, certification market, and delivery schedule. Learn about our factory quality on the About Us<\/a> page.<\/p>\n

Contact Korea Ever-Power<\/a><\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

\n

Six-pole flameproof squirrel-cage induction motor certified Ex d IIB T4 for Zone 1 and Zone 2 hazardous areas, running at approximately 960 rpm on 380 V 50 Hz. High shaft torque at moderate speed makes the 6-pole YB2 the preferred specification for classified-area slow-speed mixers, low-head fans, and applications where a single-stage reduction between motor and load is required within the hazardous zone boundary.<\/p>\n

Ex d IIB T4 Certified<\/span>
\nZone 1 \/ Zone 2<\/span>
\nSpeed: ~960 rpm (6P)<\/span>
\nPower: 1.1 \u2013 132 kW<\/span>
\nProtection: IP55<\/span>
\nInsulation: Class F<\/span><\/div>\n<\/div>","protected":false},"featured_media":23,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[20],"product_tag":[],"class_list":["post-142","product","type-product","status-publish","has-post-thumbnail","product_cat-explosion-proof-motors","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/product\/142","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/media?parent=142"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/product_brand?post=142"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/product_cat?post=142"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/industrialelectricmotor.net\/ko\/wp-json\/wp\/v2\/product_tag?post=142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}