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Understanding Masterpact NT & NW

Understanding Masterpact NT & NW. NW breaker frame Micrologic socket Auxiliaries and accessories Drawout installation Fixed Installation Range and performances. Contents NW breaker frame . Case Moving contact Current transformers Power supply Fixed contact Assembly Arc chamber

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Understanding Masterpact NT & NW

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  1. Understanding Masterpact NT & NW

  2. NW breaker frame • Micrologic socket • Auxiliaries and accessories • Drawout installation • Fixed Installation • Range and performances

  3. ContentsNW breaker frame • Case • Moving contact • Current transformers • Power supply • Fixed contact • Assembly • Arc chamber • Opening of contacts Return to contents

  4. Supports the opening /closing mechanism stored energy mechanism (OCO sequence ) Insulated organic polymer material Fire proof No halogen Case

  5. Complete assembly fingers, braids, terminal no internal bolted joint High electromechanical and thermal withstand blow on Specific limiter contact assembly L1 performance Direct link to the OCO mechanism Isolated compartments Moving contact

  6. Combined technology air core for measurement (Rogowsky) measurement precision 1% linearity from 40A to 400kA self powered iron core for trip unit power Integral connector automatically connected One CT per pole Mounted on bottom side of moving contact Current transformers

  7. Micrologic trip unit power supply Circuit breaker Communication module Micrologic COM Module Microprocesseur ASIC Additionals functions (measurement, analyses...) Basic protection Optical coupling Air CT Isolation Power supply Trip unit power supply Iron CT BUS power supply Optional external 24V DC power supply for : programmable contact power supply, when breaker is open : • Powers display, • Identification, adjustments through “Com” module Standard Internal voltage sensor or optional external voltage sensor for µP power supply and measurement

  8. Breaking the arc arcing contact protects main contacts against wear high number of electrical operation increased life expectation Top terminal no internal joint Fixed Contact

  9. Reliability reduced number of components simple concept compact modular Three cases (3x3P & 3x4P) NT06 - 16 NW 08 - 40 NW 40b - 63 Assembly

  10. Increased arc impedance favors extinguishing properties patented metallic filter high porosity energy and gas absorption results in de-ionization of external gas Reduced external projections Reduced enclosure pressure Safety clearance above arc chamber NW : not required NT : D/O no, Fixed reduced Removable for contact inspection Arc chamber NT NW

  11. Opening of contacts • Commutation principle • Contact pads protected from the electric arc for better performance Return to contents

  12. Mitop trip solenoid Making current release (DINF) NW Interface Trip alarm contact Remote reset 2 contacts module Communication module ContentsMicrologic socket Return to contents

  13. Transforms the trip command into a mechanical operation to open the breaker Activate the alarm contact (SDE) Mitop trip solenoid NW

  14. Self protection of the breaker when closing on very high fault current Standard on all NT and NW breakers Making current release (DINF) NW

  15. Accessory fixture Trip alarm contact SDE 1 communication module Auto trip controller : Missing trip unit security feature identical on NT NW Interface NW

  16. Alarm trip contactSDE NT NW • Trip signalisation on electrical fault (Mitop command) • Standard changeover contact 10A 240V on all NT and NW breakers • Optional : second alarm trip contact SDE 2 • standard or low level

  17. Remote reset NT NW • Remote reset of a tripped breaker • automatic reset of the mechanical indicator • 2 voltages : • 110 / 130 V AC • 200 / 240 V AC • Exclusive with the second SDE

  18. programmable contacts : to energize bell or visual alarms to shed and reconnect non priority circuits … 2 closing contacts10 A 240V AC Monitored by Micrologic P et H M6C : 6 programmable contacts in external DIN case 2 contacts module M2C NT NW

  19. Communication module NT • Independent modules • Breaker module • data transmission • threshold adjustment • breaker status • breaker monitoring • breaker identification • wave form capture • readings of histories & logs • Chassis module • transmission of « connected, test, disconnected » positions Return to contents

  20. Electrical operating mechanism Voltage releases Auxiliaries connection block support « OF » auxiliary switches « Ready to close » contact Locking accessories and BPFE Control unit Operation counter Front cover ContentsAuxiliaries and accessories Return to contents

  21. Charges and automatically recharges the stored-energy spring upon breaker closing AC 50 / 60 Hz 100V to 480V CA 7 references DC 24V to 250V 4 references Charging time : 4 s maxi Easy installation : 1 screw Local and remote signalisation of « spring charged » mechanical indicator «charged» Changeover contact 10A 240V Electrical operating mechanism MCH NT NW

  22. Closing (XF) & opening (MX) coils AC 50/ 60 Hz from 12V to 525V 8 references Com compatible 12 to 480V DC from 24V to 250 V 4 references Security opening coils MN and MNR AC 50/ 60 Hz from 24 to 525V 7 references DC from 24V to 250 V 5 references Voltage releases NT NW

  23. Allows the fixation of auxiliary connectors MN or MX2 MX1 XF PF MCH Supports the « OF » changeover switch block NW Auxiliaries connection block support NW

  24. OF auxiliary switches NT NW • NW • standard : block of 4 OF contacts • optional :2 additional blocks • changeover contact 10A 480V low level compatible • simplified mounting : 2 screws • rotative contacts directly operated by mechanism • NT • standard :4 OF contacts • identical to Compact NS • changeover switch 6A 480V • optional : low level contact 5A 480V • clip on type

  25. Ready to close contact PF NT • Changeover contact 10A 240V • Indicates : • the breaker is open • the stored energy mechanism is charged • the mechanism is correctly reset • the breaker opening push button is not locked • no opening order is present

  26. Installation ofMicrologic socket NW • Left side • The socket supports • communication module • Micrologic control unit

  27. « open » position breaker locking NT NW • NW • key locking :1 or 2 locks • padlocking : up to 3 padlocks • electrical closing pushbutton (BPFE) available on support • NT • key locking :1lock • padlocking : up to 3 padlocks • Locks • Ronis, Profalux, Castel

  28. 4 protection levels LI, LSI, LSIG, LSIV Combined with 3 measurement levels A : current P : A + voltage + power + energy H : P + energy quality management (harmonics) Available functions monitoring and protection measure network monitoring maintenance help Micrologiccontrol units

  29. Micrologiccontrol units NT NW • Common to all NT and NW breakers • CT rating / performance socket • breaker rating • breaking capacity (N1, H1, H2, H3, L1) • Circuit breaker is maintained in open position when control unit is missing • Interchangeable on site

  30. secondary wiring support control unit and « com » module NT NW • NW • Communication • ZSI • External neutral • Earth leakage protection (vigi) • Control unit external 24V voltage supply • External voltage (phases and neutral) • Programmable contacts M2C or M6C • NT • identical except external voltage exclusive with M2C/M6C

  31. Sums the number of operating cycles (closing /opening) maintenance help Easy installation Visible on the front panel Operation counter NW

  32. Front cover installed provides double insulation IP 20 : finger safe Attractive design Front cover NT NW Return to contents

  33. ContentsDrawout installation • Drawout accessories • Chassis • Auxiliaries terminals • Extracting the rail • Racking sequence • Primary connectors Return to contents

  34. Masterpact NTLateral side panels NT • Supports breaker on rails • Carrying handles • Easy installation with 4 screws

  35. Connection between beaker and chassis Connectors Vertically oriented for optimal heat dissipation Drawout connectors NT NW Return to contents

  36. Chassis • Back mold • Clusters • Shutters • Positions • Secondary terminals • Breaker installation

  37. Support interface primary clusters customer bus connection point Location of the shutters Back mold NW

  38. Arc chute cover installed as standard 2 sizes of chassis 800 A - 4000 A 4000 A - 6300 A 2 variants 3P 4P Chassis assembly NT NW

  39. One fits all ! Vertical orientation for better heat dissipation 10 fingers on each cluster across the entire range Clip on type Number of clusters depends on breaker frame size Clusters NT NW

  40. Reversible upper and lower Quick installation Controlled by rear of breaker Shutters actuator NW

  41. Safety shutters « up » and « down » identical but independent Shutter locking NW in front of the chassis on the primary stabs NT on the primary stabs only Safety shutter installation NT NW

  42. NW 3 changeover contacts 10A 240V for each position activated by actuators Possible to replace the test and disconnected actuator by the connected actuator to get 9 CE contacts NT 3 CE, 2 CD, 1 CT Combined «connected/closed » contacts (EF) Chassis position contactsConnected - test - disconnected NT NW

  43. 2 wires from 0,75 to 2,5mm² Predefined position Simple identification Quick connection Easy installation Auxiliaries terminals NT NW

  44. Protection of auxiliary wires Easy identification by tampoprinting Quick mounting with 2 screws Auxiliaries cover NT NW Return to contents

  45. Interlock must be defeated before removing breaker Provides guide for breaker Breaker slides in manually to disconnected position Extracting the rails and installing the breaker NT NW Return to contents

  46. Safety Automatically opens breaker before connecting or disconnecting mechanical stop in all positions Push button for releasing each mechanical stop Racking sequencewith crank handle NT NW Return to contents

  47. Connector options Rear connectors Mixed connectors Front connectors Primary connectors Return to contents

  48. Rear connectors NW 08- 32 & NW40b- 50 Al (800 - 2000) Cu (2500 - 5000) vertical or horizontal NW 40 & NW 63 specific rear connectors Front connectors Al (800 - 1600) Cu (2000 - 3200) thickness : 20 mm for all connectors identical top and bottom connector NW connector options NW

  49. Rear connectors NT 06 - 16 copper 15 mm identical for fixed and drawout Front connectors long connector on top short connector on bottom side copper 15 mm Options for front or rear connectors Spreaders pole pitch 95 mm edgewise terminal extension additional connectors ( eg: for cripmled lugs) identical for fixed and drawout NT connector options NT

  50. Connectors matched to breaker size NT 06 - 16 NW 08 - 32 NW 40b - 63 pole pitch :70, 115, 230 mm Specific rear connectors for NW40 Pole pitch : 150 mm horizontal 115 mm vertical identical for fixed and drawout Primary connectionVertical / horizontal rear NT NW

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