Motor Protection Circuit Breakers
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- Estella McBride
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1 Motor Protection Circuit Breakers
2 About us Larsen & Toubro is a technologydriven USD 9.8 billion company that infuses engineering with imagination. The Company offers a wide range of advanced solutions in the field of Engineering, Construction, Electrical & Automation, Machinery and Information Technology. L&T Switchgear, which forms part of the Electrical & Automation business, is India's largest manufacturer of low voltage switchgear, with the scale, sophistication and range to meet global benchmarks. With over four decades of experience in this field, the Company today enjoys a leadership position in the Indian market with growing presence in international markets. It offers a complete range of products including controlgear, powergear, motor starters, energy meters, wires and host of other accessories. Most of our product lines conform to international standards, carry CE markings and are certified. Switchgear Factory, Mumbai
3 Product Range L&T introduces complete range of Supernova products covering Motor Protection Circuit Breakers, Contactors / Thermal Overload Relays & Motors. Motor Protection Circuit Breakers The new range of MPCBs is meant for protection against short circuit & overload. MO Contactors & RTO Thermal Overload Relays Motors The latest range of Contactors & Thermal Overload Relays, rated from 9A to A. L&T offers higher efficiency phase LT motors, synonymous with ruggedness and reliability, suitable for all industrial applications upto 00 kw.
4 Motor Protection Circuit Breakers Functions Moulded Case Circuit Breaker and Thermal Overload Relay functions integrated into a highly compact unit known as Motor Protection Circuit Breaker. Circuit Breaker Functions Short circuit protection Overcurrent protection Line protection Thermal Overload Relay Functions Overload protection Phase loss protection Rated current adjustment Ambient temperature compensation } MPCB Advantages Compactness High Breaking Capacity Short circuit protective coordination Reduction in wiring work Ecological design standards Selecting the Appropriate Model Procedure for selecting the appropriate model: Confirm the motor's full load current Threephase load / Select the rated current of MPCB Singlephase load For applications in a singlephase circuit, connect the pole in series Select the branch circuit cable & confirm the control panel specifications Confirm the shortcircuit current of the circuit Select the operating characteristics Same characteristics as desired for a standard thermal overload relay Adjustable thermal magnetic trip type MPCB Longtime operating type or quick operating type thermal overload relay desired Instantaneous trip type MPCB
5 Typical Problem in the Conventional System and their Solution by using MPCB ShortCircuit Breaking Capacity When numerous small and medium motor loads exist in a circuit requiring high breaking capacity, there is no high breaking capacity circuit breaker with a small rated current for a short circuit protection. The MPCB can be used in ka short circuit current circuits for threephase, 0V motors with rated capacity upto kw, and in ka short circuit current circuits for three phase, V motors with rated capacity up to 0kW. Backup breaking system When backup MCCB is installed upstream to solve the problem described in Shortcircuit breaking protection above, a short in one of the load circuits also trips the upstream breaker and stops the other operating circuits. Despite their compact size, the MPCB provides highperformance shortcircuit current breaking. They eliminate the need for an upstream circuit breaker for backup use. Overload Protection Motor Protection breakers cannot be adjusted to match the rated current of the motor being protected. Equipped with a wide range current adjustment dial (with maximum/minimum ratio of. to.), the MPCB easily adjusts to match the rated current of the motor, for optimum protection. Control Panel Size Considerable space is required to install a backup circuit breaker or a combination starter consisting of a circuit breaker and a thermal overload relay. As a result, the panel size has to be increased. The compact size of the MPCB, including overload relay functions, enables a smaller installation area with less wiring space, for a reduction in panel size.
6 Technical Specifications MOG S MOG H MOG H MOG HM MOG HM Standards IEC097,, IEC097,, IEC097,, IEC097,, IEC097,, Handle type Rocker Rotary Rotary Rotary Rotary Number of poles Frame A A A A A Rated insulation voltage (Ui) AC90V AC90V AC0V AC90V AC0V Rated operational voltage (Ue) AC00 90V AC00 90V AC00 90V AC00 90V AC00 90V Rated impulse withstand voltage (Uimp) KV KV 8KV KV 8KV Rated frequency AC / 0Hz AC / 0Hz AC / 0Hz AC / 0Hz AC / 0Hz Utilization Category (IEC97 / 97 ) AC / Cat. A AC / Cat. A AC / Cat. A AC / Cat. A AC / Cat. A Maximum motor capacity AC 7. kw (at 00 0V), kw (at 80 0V) 7. kw (at 00 0V), kw (at 80 0V) kw (at 00 0V), 0 kw (at 80 0V) 7. kw (at 00 0V), kw (at 80 0V) kw (at 00 0V), 0 kw (at 80 0V) AC Electrical/Mechanical endurance 000 (A:70000) / 000 (A:70000), (cycles / hour) 000 (A:70000) / 000 (A:70000), (cycles / hour) 00 / 000, (cycles / hour) 000 (A:70000) / 000 (A:70000), (cycles / hour) 00 / 000, (cycles / hour) Tripping device Thermal Magnetic Thermal Magnetic Thermal Magnetic Magnetic Magnetic Ambient temperature compensation 0 C ~ + 0 C 0 C ~ + 0 C 0 C ~ + 0 C 0 C ~ + 0 C 0 C ~ + 0 C Overload, Phase loss protection yes (according to IEC097 ) yes (according to IEC097 ) yes (according to IEC097 ) None None Trip Indicator Yes Yes Yes Yes Yes Test Trip Function Yes Yes yes Yes Yes Instantaneous release X Ie max. x Ie max. x Ie max. x Ie max. x Ie max. Terminal type Screw terminal, M slotted Screw terminal, M slotted Box terminal, M slotted Screw terminal, M slotted Box terminal, M slotted Wire size Solid/Stranded Without/With end sleeve mm x / 8 8 AWG x mm x / 8 AWG x mm x / 8 8 AWG x mm x / 8 AWG x mm x / 8 AWG x mm x / 8 AWG x mm x / 8 8 AWG x mm x / 8 AWG x mm x / 8 AWG x mm x / 8 AWG x Product weight (Kg) Dimensions (mm) W x H x D x 90 x x 90 x x x 9 x 90 x 79 x x 9 Relative humidity ~ 8%RH No dew formation or freezing due ~ 8% RH No dew formation or freezing due ~ 8% RH No dew formation or freezing due ~ 8% RH No dew formation or freezing due ~ 8% RH No dew formation or freezing due Standard service condition Operation altitude Atmosphere Up to 000m to rapid temperature change allowed Atmosphere having no excess Vapour, Steam, Dust, Corrosive gas, Salt, Flammable gas Up to 000m to rapid temperature change allowed Atmosphere having no excess Vapour, Steam, Dust, Corrosive gas, Salt, Flammable gas Up to 000m to rapid temperature change allowed Atmosphere having no excess Vapour, Steam, Dust, Corrosive gas, Salt, Flammable gas 000m to rapid temperature change allowed Atmosphere having no excess Vapour, Steam, Dust, Corrosive gas, Salt, Flammable gas Up to 000m to rapid temperature change allowed Atmosphere having no excess Vapour, Steam, Dust, Corrosive gas, Salt, Flammable gas
7 Breaking Capacity at Different Voltages MOG S Rating Ie (A) AC0V AC0V ACV AC00V AC0V AC0V AC0V AC90V AC00V Icu (A) MOG H MOG HM Rating Ie (A) AC0V AC0V ACV AC00V AC0V AC0V AC0V AC90V AC00V Rating In (A) AC0V AC0V ACV AC00V AC0V AC90V AC0V AC0V AC00V Icu (A) Icu (A) MOG H MOG HM Rating Ie (A) AC0V AC0V ACV AC00V AC0V AC0V AC0V AC90V AC00V Rating In (A) AC0V AC0V ACV AC00V AC0V AC90V AC0V AC0V AC00V Icu (A) Icu (A)
8 Ordering Information Thermal & Magnetic Trip Rocker Frame size (mm) Rating (A) 0.A 0.A 0.A 0.A.0A.A.A.A.A.0A.0A Motor Rating at V, Hz (kw) Designation Thermal Release Range (A) 0. 0.A 0. 0.A 0. 0.A 0. 0.A 0..0A.0.A..A. A.0.A..0A 9.0.0A Cat. Nos. ST889OOOO ST890OOOO ST89OOOO ST89OOOO ST89OOOO ST89OOOO ST89OOOO ST89OOOO ST897OOOO ST898OOOO ST899OOOO Breaking Capacity mm MOG S ka Thermal & Magnetic Trip Rotary ka Frame size (mm) mm mm Rating (A) 0.A 0.A 0.A 0.A.0A.A.A.0A.A.0A.0A.0A 0.0A.0A.0A.0A 0.0A.0A.0A Motor Rating at V, Hz (kw) Designation MOG H MOG H Thermal Release Range (A) 0. 0.A 0. 0.A 0. 0.A 0. 0.A 0..0A.0.A..A..0A.0.A..0A 9.0.0A.0.0A.0 0.0A 9.0.0A.0.0A.0.0A A.0.0A.0.0A Cat. Nos. ST90OOOO ST90OOOO ST90OOOO ST907OOOO ST908OOOO ST909OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST97OOOO ST98OOOO ST99OOOO ST90OOOO ST9OOOO ST9OOOO Breaking Capacity ka ka Instantaneous Trip Rotary 8 Frame size (mm) mm mm Rating (A) 0. 0.A 0.A 0.A.0A.A.A.0A.A.0A.0A.0A 0.0A.0A.0A.0A 0.0A.0A.0A Motor Rating at V, Hz (kw) Designation MOG HM MOG HM Thermal Release Range (A) Cat. Nos. ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST97OOOO ST98OOOO ST99OOOO ST90OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST97OOOO ST98OOOO ST99OOOO ST90OOOO ST9OOOO Breaking Capacity ka ka
9 Accessories Features All accessories can be used with MOG S (mm wide), MOG H (mm wide) and MOG H (mm wide) frames Shunt trip and undervoltage trip devices are available in a wide range of operating voltages IP0 terminal cover prevents accidental contact to electrically charged parts Auxiliary contact blocks : MOGAXF, MOGAXL These blocks are linked to the ON/OFF operation of the MPCB. Up to two contact blocks can be mounted to the right/left front and up to two contact blocks can be mounted to the left side. Alarm contact blocks : MOGTAF This block operates when the MPCB trips due to overload, phaseloss, or shortcircuit. It is not linked to the ON/OFF operation of the MPCB. Note : Operation can be checked with the test trip function. Auxiliary and alarm contact blocks : MOGATL This contact block combines auxiliary contact and alarm contact that operate in the event of an overload, phase loss, or shortcircuit. Alarm contact is not linked to the ON/OFF operation of the MPCB An alarm is displayed in the contact block s indicator when the alarm contact operates Note : Operation can be checked with the test trip function. Shortcircuit alarm contact block : MOGSAL The contacts operate only when the MPCB has tripped due to a shortcircuit When these contacts operate, the blue reset button extends out, and a trip indication is displayed The power to the MPCB can be turned ON after pressing the reset button Note : Operation can not be checked with the test trip function. Be sure to press the reset button before mounting to the MPCB. Shunt trip devices : MOGST This device is used to remotely trip the MPCB. Notes: This device cannot be used together with an undervoltage trip device When the MPCB trips with the shunt trip device, press the reset button before turning ON the power 9
10 Accessories Undervoltage trip devices : MOGUV This device automatically trips the MPCB when the control circuit voltage drops below the specified value. Notes: This device cannot be used together with a shunt trip device When the MPCB has been tripped with the undervoltage trip device, press the reset button before turning ON the power External operating handles : MOGEH To operate the MPCB without opening the panel door Equipped with an interlock mechanism that prevents someone from opening the panel door when the MPCB is in the ON state The shaft can be cut to match the distance between the MPCB and the panel door Door interlock function OFF lock function Note: Padlocks not included. Release screw allows the door to be opened with the handle in the ON position IP enclosure Ratings of accessories Accessory type Part number Standard Rated operational current (A) 8V AC AC V AC 0V AC 00V AC 0V AC 90V AC 8V DC DC V DC 0V DC Min. voltage and current Auxiliary contact block/front Auxiliary contact block/side Alarm contact block Aux. and alarm contact block Shortcircuit alarm contact block MOGAXF MOGAXL MOGTAF MOGATL MOGSAL IEC V, ma Accessory type Standard Rated insulation voltage (V AC) No. of ONOFF operations Operating time (ms) Power consumption Voltage range Time rating of coil (s) Inrush (VA/W) Sealed (VA/W) Tripping voltage (V) Closing voltage (V) Shunt trip device MOGST 0.7 to.ue AC: Continuous DC: IEC / 8/. Undervoltage device MOGUV 0. to 0.7Ue 0.8 to.ue AC: Continuous Note: Ue: Rated Voltage
11 Selection Chart Fuseless Protection for DOL Starter Feeders with MPCB MOGHM/HM Coordination, Iq= ka at V, Ø, Hz as per Standards : IEC 097, IS 97 (Part /Sec. ), EN 097 The selection is valid only for complete L&T combinations i.e. MPCB + Relay + Contactor In any case if this combination is changed to accommodate another brand / rating of MPCB etc. it shall be the responsibility of the person making such a change to assure type performance Selection is for normal starting conditions with starting time According to Coordination, Iq=kA at V, Ø, Hz Sr. No. Motor Rating: Ø, V, Hz Contactor Overload Relay MPCB (Only Magnetic) hp kw I L Range (A) Rating I M (A) MO RTO MOG HM MO RTO MOG HM MO RTO MOG HM MO RTO MOG HM MO RTO MOG HM MO RTO.0. MOG HM MO RTO.. MOG HM MO RTO.8.7 MOG HM MO RTO.. MOG HM MO RTO.. MOG HM.. MO RTO..0 MOG HM MO RTO..0 MOG HM...00 MO RTO.0.0 MOG HM MO RTO. 9.0 MOG HM MO RTO. 9.0 MOG HM MO RTO. 9.0 MOG HM MO MO RTO 8.. MOG HM MO MO RTO 8.. MOG HM MO 8 MO RTO. 8 MOG HM MO MO RTO 7 MOG HM MO MO RTO 7 MOG HM MO MO RTO MOG HM MO MO RTO MOG HM MO 0 MO RTO 0 0 MOG HM MO 0 MO RTO MOG HM MO MN 0 MOG HM
12 Selection Chart Fuseless Protection for DOL Starter Feeders with MPCB MOGS/H/H '' Coordination, Iq= ka at V, Ø, Hz as per Standards : IEC 097, IS 97 (Part /Sec. ), EN 097 Sr. No Motor Rating: Ø, V, Hz Contactor Overload Relay MPCB (Only Magnetic) hp kw I L Range (A) MO MO MO 8 MO MO MO MO 0 MO 0 MO MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOG H Rating I M (A)
13 Selection Chart Fuseless Protection for DOL Starter Feeders with MPCB MOGS/H/H '' Coordination, Iq= ka at V, Ø, Hz as per Standards : IEC 097, IS 97 (Part /Sec. ), EN 097 Sr. No Motor Rating: Ø, V, Hz Overload Relay MPCB Contactor hp kw FLC, In (A) Range (A) MNX 9 MNX 9 MNX 9 MNX 9 MNX 9 MNX 9 MNX 9 MNX 8 MNX MNX MNX MNX 0 MNX 0 MNX MNX 70 MNX 80 MNX 80 MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG S / MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOG H MOGH Rating
14 Selection Chart Fuseless Protection for DOL Starter Feeders with MPCB MOGHM/HM '' Coordination, Iq= ka at V, Ø, Hz as per Standards : IEC 097, IS 97 (Part /Sec. ), EN 097 Motor Rating, V, ph. FLC Relay Sr. No. hp kw (A) Range (A) Contactor MPCB (Only Magnetic) Rating MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM MOG HM. 9 MOG HM MNX MOG HM MNX MOG HM MNX MOG HM MNX MOG HM 7. 0 MNX MOG HM MNX MOG HM 8. 0 MNX 0 MOG HM MN 0 MNX MOG HM 7 MN 0 MNX 70 MOG HM 0 0 MN 7 MNX 80 MOG HM 7. 0 MN 7 MNX 80 MOG HM
15 IT Characteristics MOG S (0.A A) MOG H (0.A A) poles from cold state poles from cold state Average Tripping Time (s) 0. poles from hot state poles from cold state Instantaneous tripping characteristic is set at 00% of the maximum current setting Average Tripping Time (s) 0. poles from hot state poles from cold state Instantaneous tripping characteristic is set at 00% of the maximum current setting Multiples of current setting x Ie[A] 0.00 Multiples of current setting x Ie[A] MOG H (A A) 00 0 Average Tripping Time (s) poles from hot state poles from cold state poles from cold state Instantaneous tripping characteristic is set at 00% of the maximum current setting Multiples of current setting x Ie[A]
16 IT Characteristics MOG HM (0.A A) 00 0 Tripping Time (s) Instabtabeous tripping characteristic is set at ~ 0% of the rated current Multiples of rated current x In[A] 00 MOG HM (A A) 0 Tripping Time (s) Instabtabeous tripping characteristic is set at ~ 0% of the rated current Multiples of rated current x In[A]
17 Overall Dimensions MOG S (0.A A).. Ø. 7 M L L L M MOG H & MOG HM (0.A A) Ø. 9 M L L L M T T T T T T MOG H & MOG HM (A A) L L L M T T T. 7
18 Overall Dimensions Trip Alarm Contact Front NO 9 M... MOGTAFINO I> MOGTAFINC I> S / C Alarm Left NO + NC M. Trip indication (reset by hand). MOGSALICO I>
19 Overall Dimensions External Operating Handle (Applicable for Frame & ) MMS A ~ RESET TRIP ON Ø. MMS OFF. Ø8.±0. () MMS.7.±0.. Handle.~ X OFF. (Ø~Ø8) 8 X min X max 7 Frame Frame + +0 B Aux. Contact Front NO 9 M... MOGAXFINO () I> () MOGAXFINC () I> () 9
20 Overall Dimensions Aux. Alarm Left NO M. 8.7 Indication window. MOGATLNO I Aux. Contact Left NO. 9.8 M Left side Right side MOGAXLNO MOGAXLCO MOGAXLNC () () () () () () I () () I () () I () () 0
21 Overall Dimensions Shunt trip and under voltage release MOG ST & MOG UV.8 8 M Accessories for MPCB Cat. Nos. Description Model Numbers Position ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST97OOOO ST98OOOO ST99OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO ST9OOOO F Front Mounting L LHS Mounting R RHS Mounting Auxiliary Contact Front mtg. NO Auxiliary Contact Front mtg. NC Auxiliary Contact Left side mtg. NO Auxiliary Contact Left side mtg. NO + NC Auxiliary Contact Left side mtg. NC Trip Alarm Contact Front mtg. NO Trip Alarm Contact Front mtg. NC Auxiliary + Alarm Left side mtg. NO Short circuit alarm Left side mtg. NO + NC Shunt trip V DC Shunt trip V, Hz Shunt trip 0V, Hz Under Voltage release, V, Hz Under Voltage release, V, Hz MOGAXF NO MOGAXF NC MOGAXL NO MOGAXL CO MOGAXL NC MOGTAF NO MOGTAF NC MOGATL NO MOGSAL CO MOGST MOGST MOGST MOGUV MOGUV F (Slot / Slot ) F (Slot / Slot ) L L L F (Slot only) F (Slot only) L L R (one at a time) Terminal Marking NO NC, (, ), (, ) ", (, ), (, )", (, ) 7, 8 "7, 7 77, 78" 87, 88 C, C D, D, (, ) ", (, ), (, )", 8, 8 Note: ) On LHS any accessories can be fitted (Alarm contact followed by Auxiliary contact) MOGATL NO + MOGAXL CO MOGSAL CO + MOGAXL CO ) On RHS only accessory can be fitted (Shunt trip release or Undervoltage release) ) Any Front mounted accessories are possible at a time. Front mounted TAF to be fitted only in slot Front mounted auxiliary contact can be fitted in slot / slot
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