Masterpact NT and NW LV power circuit breakers and switch-disconnectors

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1 Low oltage Masterpact NT and NW LV power circuit reakers and switch-disconnectors Catalogue 2009

2 Presentation Masterpact NT and NW The standard for power circuit reakers around the world. Oer the years, other major manufacturers hae tried to keep up y deeloping products incorporating Masterpact s most innoatie features, including the reaking principle, modular design and the use of composite materials. In addition to the traditional features of power circuit reakers (withdrawaility, discrimination and low maintenance), Masterpact NT and NW ranges offer uilt-in communications and metering functions, all in optimised frame sizes. Masterpact NT and NW incorporate the latest technology to enhance oth performance and safety. Easy to install, with user-friendly, intuitie operation and enironment-friendly design, Masterpact NT and NW are, quite simply, circuit reakers of their time. 1

Two families and three frame sizes The range of power circuit reakers includes two families: > Masterpact NT, the world s smallest true power circuit reaker, with ratings from 630 to 1600 A >

> H1 - for industrial sites with high short-circuit leels or installations with two parallel-connected transformers. > H2 - high-performance for heay industry where ery high short-circuits can occur.

3 Two families and three frame sizes The range of power circuit reakers includes two families: > Masterpact NT, the world s smallest true power circuit reaker, with ratings from 630 to 1600 A > Masterpact NW, in two frame sizes, one from 800 to 4000 A and the other from 4000 A to 6300 A. 5 performance leels > N1 - for standard applications with low short-circuit leels. > H1 - for industrial sites with high short-circuit leels or installations with two parallel-connected transformers. > H2 - high-performance for heay industry where ery high short-circuits can occur. > H3 - for incoming deices supplying critical applications requiring oth high performance and a high leel of discrimination. > L1 - for high current-limiting capaility and a discrimination leel (37 ka) as yet unequalled y any other circuit reaker of its type; intended for the protection of cale-type feeders or to raise the performance leel of a switchoard when the transformer power rating is increased. Masterpact NT 630 to 1600 A L1 150 ka H2 50 ka H1 42 ka NT06 NT08 NT10 NT12 NT16 Masterpact NW 800 to 4000 A L1 150 ka H3 150 ka H2 100 ka H1 65 ka N1 42 ka NW08 NW10 NW12 NW16 NW20 NW25 NW32 NW to 6300 A H2 150 ka H1 100 ka NW40 NW50 NW63 3

Optimised olumes and ease of installation Aiming at standardising electrical switchoards at a time when installations are increasingly complex, Masterpact proides an unequalled simplicity, oth

4 Optimised olumes and ease of installation Aiming at standardising electrical switchoards at a time when installations are increasingly complex, Masterpact proides an unequalled simplicity, oth concerning choice and installation. The smallest circuit reaker in the world Masterpact NT innoates y offering all the performance of a power circuit reaker in an extremely small olume. The 70 mm pole pitch means a three-pole draw out circuit reaker can e installed in a switchoard section 400 mm wide and 400 mm deep. Retrofit solutions Maximum security The arc chutes asor the energy released during reaking, thus limiting the stresses exerted on the installation. They filter and cool the gases produced, reducing effects perceptile from the outside. Optimised olumes Up to 4000 A, Masterpact NW circuit reakers are all the same size, the same as the old M08 to 32 range. From 4000 A to 6300 A, there is just one size. More than 60 patents are used to design Masterpact > Special connections terminals are aailale to replace a fixed or a drawout Masterpact M08 to 32 with a Masterpact NW, without modifying the usars or the door cut-out. > "Plug and Play" retrofit solution : this solution enales retrofitting of Masterpact M units with consideraly reducing on-site interention time and getting the performance of last generation deice. The original Masterpact M chassis is kept (no interention on the switchoard structure) Masterpact NW adapted for "Plug and Play" solution Masterpact M y 3200 A 30 minutes and 2 easy operations The retrofit solutions use a factory modified and adapted Masterpact NW which is installed in Masterpact M s original chassis. 4

Functions and characteristics General oeriew Detailed contents PB100762-60A This chapter descries all the functions offered y Masterpact NT and NW deices.

Circuit reakers and switch-disconnectors page A-4 ratings: Masterpact NT 630 to 1600 A Masterpact NW 800 to 6300 A circuit reakers type N1, H1, H2, H3, L1 switch-disconnectors type NA, HA, HF 3 or 4

5 Functions and characteristics General oeriew Detailed contents PB A This chapter descries all the functions offered y Masterpact NT and NW deices. The two product families hae identical functions implemented using the same or different components depending on the case. Circuit reakers and switch-disconnectors page A-4 ratings: Masterpact NT 630 to 1600 A Masterpact NW 800 to 6300 A circuit reakers type N1, H1, H2, H3, L1 switch-disconnectors type NA, HA, HF 3 or 4 poles fixed or drawout ersions option with neutral on the right protection derating. Micrologic control units page A-10 Ammeter A 2.0 asic protection 5.0 selectie protection 6.0 selectie + earth-fault protection 7.0 selectie + earth-leakage protection Power meter P 5.0 selectie protection 6.0 selectie + earth-fault protection 7.0 selectie + earth-leakage protection Harmonic meter H 5.0 selectie protection 6.0 selectie + earth-fault protection 7.0 selectie + earth-leakage protection external sensor for earth-fault protection rectangular sensor for earth-leakage protection setting options (long-time rating plug): low setting 0.4 to 0.8 x Ir high setting 0.8 to 1 x Ir without long-time protection external power-supply module attery module. DB DB Portale data acquisition page A-22 Masterpact and GetnSet DB PB104347A55 Communication page A-24 COM option in Masterpact Masterpact in a communication network Masterpact and the Micro Power Serer MPS100. Connections page A-31 rear connection (horizontal or ertical) front connection mixed connections optional accessories are-cale connectors and connector shields terminal shields ertical-connection adapters cale-lug adapters interphase arriers spreaders disconnectale front-connection adapter safety shutters, shutter locking locks, shutter position indication and locking. DB DB DB DB A-2

PB104348A55 Locking page A-35 pushutton locking y padlockale transparent coer OFF-position locking y padlock or keylock chassis locking in disconnected position y keylock chassis locking in

and OFF pushutton automatic spring discharge efore reaker remoal mismatch protection.

6 PB104348A55 Locking page A-35 pushutton locking y padlockale transparent coer OFF-position locking y padlock or keylock chassis locking in disconnected position y keylock chassis locking in connected, disconnected and test positions door interlock (inhiits door opening with reaker in connected position) racking interlock (inhiits racking with door open) racking interlock etween crank and OFF pushutton automatic spring discharge efore reaker remoal mismatch protection. DB DB PB104353A55 PB104349A55 Indication contacts page A-37 standard or low-leel contacts: ON/OFF indication (OF) fault trip indication (SDE) carriage switches for connected (CE) disconnected (CD) and test (CT) positions programmale contacts: 2 contacts (M2C) 6 contacts (M6C). DB M2C contact. DB OF contact. Remote operation page A-39 remote ON/OFF: gear motor XF closing or MX opening oltage releases PF ready-to-close contact options: RAR automatic or RES electrical remote reset - BPFE electrical closing pushutton remote tripping function: MN oltage release - standard - adjustale or non-adjustale delay or second MX oltage release. DB DB Gear motor. MX, XF and MN olage releases. Accessories page A-43 auxiliary terminal shield operation counter escutcheon transparent coer for escutcheon escutcheon lanking plate. DB A-3

Functions and characteristics Circuit reakers and switch-disconnectors NW08 to NW63 PB104423A35 Common characteristics Numer of poles 3/4 Rated insulation oltage (V) Ui 1000/1250 Impulse withstand

7 Functions and characteristics Circuit reakers and switch-disconnectors NW08 to NW63 PB104423A35 Common characteristics Numer of poles 3/4 Rated insulation oltage (V) Ui 1000/1250 Impulse withstand oltage (kv) Uimp 12 Rated operational oltage (V AC 50/60 Hz) Ue 690/1150 Suitaility for isolation IEC Degree of pollution IEC (1000 V) / 3 (1250 V) Basic circuit-reaker Circuit-reaker as per IEC Rated current (A) at 40 C / 50 C (1) Rating of 4th pole (A) Sensor ratings (A) PB104433A65 (1) 50 C: rear ertical connected. Refer to temperature derating tales for other connection types. (2) See the current-limiting cures in the additional characteristics section. (3) Equipped with a trip unit with a making current of 90 ka peak. (4) External protection must comply with permissile thermal constraints of the circuit reaker (please consult us). No fault-trip indication y the SDE or the reset utton. (5) Aailale for 480 V NEMA. (6) Suitale for motor control (direct-on-line starting). A-8 Type of circuit reaker Ultimate reaking capacity (ka rms) V AC 50/60 Hz Rated serice reaking capacity (ka rms) Ics % Icu Utilisation category Rated short-time withstand current (ka rms) V AC 50/60 Hz Icw 1 s 3 s Integrated instantaneous protection (ka peak ±10 %) Rated making capacity (ka peak) V AC 50/60 Hz Break time (ms) etween tripping order and arc extinction Closing time (ms) Circuit-reaker as per NEMA AB1 Breaking capacity (ka) V AC 50/60 Hz Icu Icm 220/415/440 V 525 V 690 V 1150 V 220/415/440 V 525 V 690 V 1150 V 240/480 V 600 V Unprotected circuit-reaker Tripping y shunt trip as per IEC Type of circuit reaker Ultimate reaking capacity (ka rms) V AC 50/60 Hz Icu V Rated serice reaking capacity (ka rms) Ics % Icu Rated short-time withstand current (ka rms) Icw 1 s 3 s Oerload and short-circuit protection External protection relay: short-circuit protection, maximum delay: 350 ms (4) Rated making capacity (ka peak) V AC 50/60 Hz Icm V Switch-disconnector as per IEC and Annex A Type of switch-disconnector Rated making capacity (ka peak) AC23A/AC3 category V AC 50/60 Hz Rated short-time withstand current (ka rms) AC23A/AC3 category V AC 50/60 Hz Icm Icw V 1150 V 1 s 3 s Earthing switch Latching capacity (ka peak) 135 Rating short time withstand (ka rms) Icw 1 s 60 Hz 3 s 50 Hz Mechanical and electrical duraility as per IEC /3 at In/Ie Serice life Mechanical with maintenance C/O cycles x 1000 without maintenance Type of circuit reaker Rated current In (A) C/O cycles x 1000 Electrical without maintenance 440 V (5) IEC V 1150 V Type of circuit reaker or switch-disconnector Rated operational current Ie (A) AC23A C/O cycles x 1000 Electrical without maintenance 440 V (5) IEC V Type of circuit reaker or switch-disconnector Rated operational current Ie (A) AC3 (6) Motor power 380/415 V (kw) 440 V (5) (kw) 690 V (kw) C/O cycles x 1000 Electrical without maintenance 440/690 V (5) IEC Annex M/IEC

8 Sensor selection Sensor rating (A) 250 (1) Ir threshold setting(a) to 250 to 400 to 630 to 800 to 1000 to 1250 to 1600 to 2000 to 2500 to 3200 to 4000 to 5000 to 6300 (1) For circuit-reaker NW02, please consult us. NW08 NW10 NW12 NW16 NW20 NW25 NW32 NW40 NW40 NW50 NW to to to to to to to to to to to 6300 N1 H1 H2 L1 (2) H10 H1 H2 H3 L1 (2) H10 H1 H2 H3 H10 H1 H % 100 % 100 % 100 % B B B B < 70 < 70 < 70 < HA HF (3) HA HF (3) HA HF (3) HA % 100 % 100 % 100 % NW08/NW10/NW12 NW16 NW20 NW25/NW32/NW40 NW40/NW50/NW63 NA HA HF HA10 HA HF HA10 HA HF HA10 HA HF HA10 HA N1/H1/H2 L1 H10 H1/H2 H3 L1 H10 H1/H2 H3 H10 H1 H2 800/1000/1250/ /3200/ /5000/ H1/H2/HA/HF H1/H2/H3/HA/HF H1/H2/H3/HA/HF H1/H2/HA 800/1000/1250/ /3200/ /5000/ H1/H2/HA/HF H1/H2/H3/HA/HF to to to to to to to to to to 1300 y to to to to A-9

9 Functions and characteristics Micrologic control units Micrologic A ammeter E46028 Micrologic A control units protect power circuits. They also offer measurements, display, communication and current maximeters. Version 6 proides earth-fault protection, ersion 7 proides earth-leakage protection. 1 long-time threshold and tripping delay 2 oerload alarm (LED) at 1,125 Ir 3 short-time pick-up and tripping delay 4 instantaneous pick-up 5 earth-leakage or earth-fault pick-up and tripping delay 6 earth-leakage or earth-fault test utton 7 long-time rating plug screw 8 test connector 9 lamp test, reset and attery test 10 indication of tripping cause 11 digital display 12 three-phase argraph and ammeter 13 naigation uttons "Ammeter" measurements Micrologic A control units measure the true (rms) alue of currents. They proide continuous current measurements from 0.2 to 20 In and are accurate to within 1.5 % (including the sensors). A digital LCD screen continuously displays the most heaily loaded phase (Imax) or displays the I1, I2, I3, IN, Ig,I n, stored-current (maximeter) and setting alues y successiely pressing the naigation utton. The optional external power supply makes it possile to display currents < 20 % In. Below 0.05 In, measurements are not significant. Between 0.05 and 0.2 In, accuracy is to within 0.5 % In % of the reading. Communication option In conjunction with the COM communication option, the control unit transmits the following: settings all ammeter measurements tripping causes maximeter readings. Protection Protection thresholds and delays are set using the adjustment dials. Oerload protection True rms long-time protection. Thermal memory: thermal image efore and after tripping. Setting accuracy may e enhanced y limiting the setting range using a different long-time rating plug. Oerload protection can e cancelled using a specific LT rating plug "Off". Short-circuit protection Short-time (rms) and instantaneous protection. Selection of I 2 t type (ON or OFF) for short-time delay. Earth-fault protection Residual or source ground return earth fault protection. Selection of I 2 t type (ON or OFF) for delay. Residual earth-leakage protection (Vigi). Operation without an external power supply. q Protected against nuisance tripping. k DC-component withstand class A up to 10 A. Neutral protection On three-pole circuit reakers, neutral protection is not possile. On four-pole circuit reakers, neutral protection may e set using a three-position switch: neutral unprotected (4P 3d), neutral protection at 0.5 Ir (4P 3d + N/2), neutral protection at Ir (4P 4d). Zone selectie interlocking (ZSI) A ZSI terminal lock may e used to interconnect a numer of control units to proide total discrimination for short-time and earth-fault protection, without a delay efore tripping. Oerload alarm A yellow alarm LED goes on when the current exceeds the long-time trip threshold. Fault indications LEDs indicate the type of fault: oerload (long-time protection Ir) short-circuit (short-time Isd or instantaneous li protection) earth fault or earth leakage (Ig or I n) internal fault (Ap). Battery power The fault indication LEDs remain on until the test/reset utton is pressed. Under normal operating conditions, the attery supplying the LEDs has a serice life of approximately 10 years. Test A mini test kit or a portale test kit may e connected to the test connector on the front to check circuit-reaker operation. For Micrologic 6.0 A and 7.0 A control units, the operation of earth-fault or earth-leakage protection can e checked y pressing the test utton located aoe the test connector. Note: Micrologic A control units come with a transparent leadseal coer as standard. A-12

10 Protection Micrologic 2.0 A Long time Current setting (A) Tripping etween 1.05 and 1.20 x Ir Other ranges or disale y changing long-time rating plug Time setting tr (s) Time delay (s) Accuracy: 0 to -30 % 1.5 x Ir Accuracy: 0 to -20 % 6 x Ir 0.7 (1) Accuracy: 0 to -20 % 7.2 x Ir 0.7 (2) Thermal memory 20 minutes efore and after tripping (1) 0 to -40 % - (2) 0 to -60 % Instantaneous Pick-up (A) Isd = Ir x Accuracy: ±10 % Time delay Max resettale time: 20 ms Max reak time: 80 ms DB Ammeter Micrologic 2.0 A Continuous current measurements Display from 20 to 200 % of In I1 I2 I3 IN Accuracy: 1.5 % (including sensors) No auxiliary source (where I > 20 % In) Maximeters I1 max I2 max I3 max IN max Protection Micrologic 5.0 / 6.0 / 7.0 A Long time Micrologic 5.0 / 6.0 / 7.0 A Current setting (A) Ir = In x Tripping etween 1.05 and 1.20 x Ir Other ranges or disale y changing long-time rating plug Time setting tr (s) Time delay (s) Accuracy: 0 to -30 % 1.5 x Ir Accuracy: 0 to -20 % 6 x Ir 0.7 (1) Accuracy: 0 to -20 % 7.2 x Ir 0.7 (2) Thermal memory 20 minutes efore and after tripping (1) 0 to -40 % - (2) 0 to -60 % Short time Pick-up (A) Isd = Ir x Accuracy: ±10 % Time setting tsd (s) Settings I 2 t Off I 2 t On Time delay (ms) at 10 x Ir tsd (max resettale time) (I 2 t Off or I 2 t On) tsd (max reak time) Instantaneous Pick-up (A) Ii = In x off Accuracy: ±10 % Time delay Max resettale time: 20 ms Max reak time: 50 ms Earth fault Micrologic 6.0 A Pick-up (A) Ig = In x A B C D E F G H J Accuracy: ±10 % In y 400 A A < In < 1250 A In u 1250 A Time setting tg (s) Settings I 2 t Off I 2 t On Time delay (ms) tg (max resettale time) at In or 1200 A (I 2 t Off or I 2 t On) tg (max reak time) Residual earth leakage (Vigi) Micrologic 7.0 A Sensitiity (A) IDn Accuracy: 0 to -20 % Time delay Dt (ms) Settings Dt (max resettale time) Dt (max reak time) DB DB DB Ammeter Micrologic 5.0 / 6.0 / 7.0 A Continuous current measurements Display from 20 to 200 % of In I1 I2 I3 IN Ig IDn Accuracy: 1.5 % (including sensors) No auxiliary source (where I > 20 % In) Maximeters I1 max I2 max I3 max IN max Ig max IDn max Note: All current-ased protection functions require no auxiliary source. The test / reset utton resets maximeters, clears the tripping indication and tests the attery. A-13

Remote operation Remote ON / OFF PB104349A68 Two solutions are aailale for remote operation of Masterpact deices: a point-to-point solution a us solution with the COM communication option.

11 Remote operation Remote ON / OFF PB104349A68 Two solutions are aailale for remote operation of Masterpact deices: a point-to-point solution a us solution with the COM communication option. The remote ON / OFF function is used to remotely open and close the circuit reaker. It is made up of: an electric motor MCH equipped with a springs charged limit switch contact CH two oltage releases: a closing release XF an opening release MX. Optionally, other functions may e added: a ready to close contact PF an electrical closing pushutton BPFE remote RES following a fault. A remote-operation function is generally comined with: deice ON / OFF indication OF fault-trip indication SDE. Wiring diagram of a point-to-point remote ON / OFF function DB Note: an opening order always takes priority oer a closing order. If opening and closing orders occur simultaneously, the mechanism discharges without any moement of the main contacts. The circuit reaker remains in the open position (OFF). In the eent of maintained opening and closing orders, the standard mechanism proides an anti-pumping function y locking the main contacts in open position. Anti-pumping function. After fault tripping or intentional opening using the manual or electrical controls, the closing order must first e discontinued, then reactiated to close the circuit reaker. When the automatic reset after fault trip (RAR) option is installed, to aoid pumping following a fault trip, the automatic control system must take into account the information supplied y the circuit reaker efore issuing a new closing order or locking the circuit reaker in the open position (information on the type of fault, e.g. oerload, short-time fault, earth fault, earth leakage, short-circuit, etc.). DB Wiring diagram of a us-type remote ON / OFF function Note: MX communicating releases are of the impulse type only and cannot e used to lock a circuit reaker in OFF position. For locking in OFF position, use the remote tripping function (2nd MX or MN). When MX or XF communicating releases are used, the third wire (C3, A3) must e connected een if the communication module is not installed. When the control oltage (C3-C1 or A3-A1) is applied to the MX or XF releases, it is necessary to wait 1.5 seconds efore issuing an order. Consequently, it is adised to use standard MX or XF releases for applications such as source-changeoer systems. A-39

Functions and characteristics Remote operation Remote ON / OFF PB100797-23 PB100808-32 Electric motor MCH The electric motor automatically charges and recharges the spring mechanism when the circuit

The electric motor MCH is equipped as standard with a limit switch contact CH that signals the charged position of the mechanism (springs charged).

12 Functions and characteristics Remote operation Remote ON / OFF PB PB Electric motor MCH The electric motor automatically charges and recharges the spring mechanism when the circuit reaker is closed. Instantaneous reclosing of the reaker is thus possile following opening. The spring-mechanism charging handle is used only as a ackup if auxiliary power is asent. The electric motor MCH is equipped as standard with a limit switch contact CH that signals the charged position of the mechanism (springs charged). Characteristics Power supply V AC 50/60 Hz 48/60-100/ / / / V DC 24/30-48/60-100/ /250 Operating threshold 0.85 to 1.1 Un Consumption (VA or W) 180 Motor oercurrent 2 to 3 In for 0.1 s Charging time maximum 3 s for Masterpact NT maximum 4 s for Masterpact NW Operating frequency maximum 3 cycles per minute CH contact 10 A at 240 V DB PB PB Electric motor MCH for Masterpact NT. XF and MX oltage releases. Ready to close contacts PF. A-40 Electric motor MCH for Masterpact NW. Voltage releases XF and MX Their supply can e maintained or automatically disconnected. Closing release XF The XF release remotely closes the circuit reaker if the spring mechanism is charged. Opening release MX The MX release instantaneously opens the circuit reaker when energised. It locks the circuit reaker in OFF position if the order is maintained (except for MX communicating releases). Note: whether the operating order is maintened or automatically disconnected (pulse-type), XF or MX communicating releases ( us solution with COM communication option) always hae an impulse-type action (see diagram). Characteristics XF MX Power supply V AC 50/60 Hz / / /480 V DC 12-24/30-48/60-100/ /250 Operating threshold 0.85 to 1.1 Un 0.7 to 1.1 Un Consumption (VA or W) Hold: 4.5 Pick-up: 200 (200 ms) Circuit-reaker response time at Un 55 ms ±10 (Masterpact NT) 50 ms ±10 70 ms ±10 (NW y 4000 A) 80 ms ±10 (NW > 4000 A) Hold: 4.5 Pick-up: 200 (200 ms) Ready to close contact PF The ready to close position of the circuit reaker is indicated y a mechanical indicator and a PF changeoer contact. This signal indicates that all the following are alid: the circuit reaker is in the OFF position the spring mechanism is charged a maintained opening order is not present: MX energised fault trip remote tripping second MX or MN deice not completely racked in deice locked in OFF position deice interlocked with a second deice. Characteristics NT/NW Maximum numer 1 Breaking capacity (A) Standard Minimum load: 100 ma/24 V p.f.: 0.3 V AC 240/380 5 AC12/DC V DC 24/ Low-leel Minimum load: 2 ma/15 V V AC 24/ V DC 24/

13 Electrical diagrams Correspondences etween Masterpact NW and Masterpact M terminal locks. Power Control unit Remote operation DB Indication contacts Chassis contacts DB Identical to Masterpact M. Different than Masterpact M. New or additional functions. (1) The current transformer for the external neutral must e replaced. B-23

14 Electrical diagrams Masterpact NT and NW Earth-fault and earth-leakage protection Neutral protection Zone selectie interlocking External sensor (CT) for residual earth-fault protection Connection of current-transformer secondary circuit for external neutral Masterpact equipped with a Micrologic 6 A/P/H: shielded cale with 2 twisted pairs T1 twisted with T2 maximum length 10 meters cale cross-sectional area 0.4 to 1.5 mm 2 recommended cale: Belden 9552 or equialent. For proper wiring of neutral CT, refer to instruction Bulletin shipped with it. Do not remoe factory-installed jumper etween T1 and T2 unless neutral CT is connected. Do not install jumper etween T3 and T4. If supply is ia the top, follow the shematics. If supply is ia the ottom, control wiring is identical; for the power wiring, H1 is connected to the source side, H2 to the load side. For four-pole ersions, for residual earth-fault protection, the current transformer for the external neutral is not necessary. Connection for signal VN is required only for power measurements (3 Ø, 4 wires, 4CTs). DB Shield Drain External transformer for source ground return (SGR) earth-fault protection Connection of the secondary circuit Masterpact equipped with a Micrologic 6 A/P/H: unshielded cale with 1 twisted pair maximum length 150 meters cale cross-sectional area 0.4 to 1.5 mm 2 terminals 5 and 6 may not e used at the same time use terminal 5 for NW08 to 40 use terminal 6 for NW40 to 63 recommended cale: Belden 9409 or equialent. DB D-10

Low voltage. Masterpact NT and NW. LV power circuit breakers and switch-disconnectors Draw-out Type & Fixed Type. Catalogue

Low voltage. Masterpact NT and NW. LV power circuit breakers and switch-disconnectors Draw-out Type & Fixed Type. Catalogue Low voltage Masterpact NT and NW LV power circuit breakers and switch-disconnectors Draw-out Type & Fixed Type Catalogue 2015 Functions and characteristics Circuit breakers and switch-disconnectors NT06