Mitsubishi NV125-SV 3P 63A Earth Leakage Circuit Breaker

NV = Earth Leakage Circuit Breaker (ELCB); NF = standard MCCB without earth leakage protection; 125 = Frame size AF125A; SV = Standard S model; 3P = 3-pole; 63A = rated operational current In=63A

✅ Core Electrical Specifications

Articol	Parametru
Full Model No.	NV125‑SV 3P 63A with adjustable earth leakage 100/200/500mA
Rated Voltage Ue	AC100~440V, suitable for 3-phase 3-wire / single-phase 2-wire circuits
Rated Current In	63O
Polonii	3P (3 faze, neutral not switched)
Short-circuit Breaking Capacity Icu/Ics@AC400V	30cel / 30cel
Earth Leakage Sensitivity	3-level adjustable: 100mA / 200mA / 500mA
Tip de scurgere	tip AC, surge resistant, anti-harmonic, suppresses nuisance tripping
Timp de funcționare	Max. 0.04s
Dimensiunea de ansamblu (L×A×D)	90mm × 130mm × 90mm
Greutate	Aproximativ. 1.1kg

📌 Model Code Breakdown

NV: Earth Leakage Circuit Breaker (ELCB, moulded case type with leakage protection)
125: Frame rating 125A (dimensiunea cadrului, this unit rated 63A)
SV: Tip S standard (New WS-V generation); CV = Economy type, HV = High breaking capacity type
3P: 3-pol, protects 3 live phases, neutral line does not pass through breaker
63O: Continuous rated circuit current 63A

Common suffix: 1.2.500MA = 100/200/500mA adjustable earth leakage

🛠️ Application Scenarios

Industrial control panels, pompe de apa, fani, small 3-phase power circuits

Integrated protection for equipment: scurgere la pământ, suprasarcina & protectie la scurtcircuit

Suitable for harmonic-rich environments (VFD, servomotoare), less prone to nuisance tripping than older generations

Montare pe panou, standard screw terminals; optional accessories: Alarm switch AL, Auxiliary switch AX, Excursie cu șunt / Under-voltage coil

⚠️ Selection & Note de înlocuire

Distinguish NV (ELCB with leakage) vs NF (standard MCCB without leakage). Similar appearance, NU este direct interschimbabil.
3P version does NOT disconnect neutral conductor. Select 4P model NV125-SV 4P if neutral switching is required.
Earth leakage threshold is preset at factory and adjustable via rotary knob on site; 100mA pentru protectia personala, 200/500mA for equipment fire protection.
Domestic alternatives reference: CHNT NM1LE-125S/3P 63A, Delixi CDM1LE-125/3P 63A; verify breaking capacity and adjustable leakage range.
Within the same frame size, current rating can be changed directly (63/75/80/100/125O), mounting dimensions remain unchanged.

🧰 Troubleshooting Quick Reference

Trips immediately upon closing: Priority check for earth leakage or damaged load insulation; try higher leakage threshold.

Overload tripping: Continuous load current >63O; inspect motor / cable loading.

Declanșare în scurtcircuit: Severe short circuit; power off and inspect for phase-to-phase short circuit.

Leakage protection fails to operate: Press red TEST button periodically; verify leakage function monthly.

Mitsubishi NV125-SV (WS-V Series) Built-in Accessory List (TOPOR / AL / SHT / UVT)

All accessories are clip-on built-in modules, field mountable; compatible for NV125-SV / NF125-SV same frame; accessories installed in the right-side compartment of breaker.

AX Auxiliary Switch

Model: TOPOR-03SVU

Funcţie: Reports ON/OFF status of main contacts, cannot distinguish manual opening or fault tripping

Evaluarea contactului: 1a1b (1NU +1NC)

Aplicație: Send breaker position signal to PLC / lămpi indicatoare

Cablaj: Lead wire type; SLT version available with terminal block

AL Alarm Switch

Model: AL-03SVU

Funcţie: Activates ONLY when tripped by fault (suprasarcina, scurtcircuit, scurgere la pământ); no action during manual opening

Evaluarea contactului: 1a1b

Aplicație: Fault trip alarm, SCADA signal upload, audible & visual alarm

Combined module: ALAX-03SVU = integrated AX+AL module (provides both position feedback and fault trip signal, cel mai utilizat)

SHT Shunt Trip

Voltage variants:

SHTA240-03SVU: AC100～240V AC shunt trip

SHTA440-03SVU: AC200～440V AC shunt trip

SHTD100-03SVU: DC24V DC shunt trip

Sufixul U: built-in module; L = extended lead; S = special spec

Funcţie: Remote electrical trip via control signal; used for emergency stop, fire linkage circuit cut-off

Important note: Short-time energized type, continuous power supply is prohibited.

UVT Under Voltage Trip

Two types:

UVTN-03SVU Non-synchronous UVT: Instant trip upon voltage drop

UVTS-03SVU Synchronous UVT: Trip at voltage zero-crossing during voltage drop, for large inductive loads to reduce breaking surge

Voltage ratings: AC100/200/240/400V optional

Funcţie: Automatic trip when main circuit voltage drops or power loss; will NOT auto-reclose after voltage recovery, manual closing required on site.

External Accessories for NV125-SV

Model accesoriu	Nume	Descriere
TC‑1SV	Capac terminal	Insulation protection for exposed terminals
LC‑1SV	Padlock device	Handle lockout, prevent accidental closing
MI‑05SV3	Interblocare mecanică	Mechanical interlock for 2 întreruptoare de circuit (dual power switching)
HLF‑1SV	External rotary handle	Panel mounted operating handle, with door interlock

⚠️ Selection & Restricții de instalare (Critic)

One NV125-SV breaker can be fitted with max. one built-in accessory module only. SHT + ALAX cannot be installed together.

Option A: ALAX (poziţie + fault signal)

Option B: SHT (declanșarea de la distanță)

Option C: UVT (under-voltage protection)

Built-in accessories occupy space on the right side of breaker. Do not mount breakers side-by-side with zero clearance when fitted with internal accessories (UVT needs extra space).
Two ordering options:

Breaker pre-fitted with accessories at factory (complete unit order)

Purchase accessory modules separately and assemble on site

ELCB NV125-SV supports SHT/UVT installation for fire linkage and loss-of-voltage protection; accessories are interchangeable with NF125-SV standard MCCB.

Ordering Examples

NV125-SV 3P 63A + ALAX-03SVU (with switch position & fault alarm contacts)

NV125-SV 3P 63A + SHTA240-03SVU (AC220V remote shunt trip)

Full Model List of Mitsubishi NV125-SV (WS-V ELCB)

Frame AF125, Icu=30kA / Ics=30kA @AC400V; Standard AC type leakage 100/200/500mA adjustable; 3P /4P; deplasare termomagnetică; dimension W90×H130×D90mm

Naming format: NV125-SV [3P/4P] [Rated Current A]

✅ Rated Current Range (În)

16O, 20O, 25O, 32O, 40O, 50O, 63O, 75O, 80O, 100O, 125O

✅ Full Model Matrix

3P (3-fază, neutral not switched)

NV125-SV 3P 16A

NV125-SV 3P 20A

NV125-SV 3P 25A

NV125-SV 3P 32A

NV125-SV 3P 40A

NV125-SV 3P 50A

NV125-SV 3P 63A (target model)

NV125-SV 3P 75A

NV125-SV 3P 80A

NV125-SV 3P 100A

NV125-SV 3P 125A

4P (3-fază + polul neutru, neutral can be disconnected)

NV125-SV 4P 16A

NV125-SV 4P 20A

NV125-SV 4P 25A

NV125-SV 4P 32A

NV125-SV 4P 40A

NV125-SV 4P 50A

NV125-SV 4P 63A

NV125-SV 4P 75A

NV125-SV 4P 80A

NV125-SV 4P 100A

NV125-SV 4P 125A

Derived variants on same WS-V platform

NV125-CV: Varianta economica, Icu=10kA @AC400V

NV125-HV: Capacitate mare de rupere, Icu=50kA @AC400V

NV125-SEV/HEV: Electronic trip ELCB (electronic protection, long/short time delay available)

Suffix explanation: 1.2.500MA = 100/200/500mA adjustable leakage (standard for China market); 30mA high-speed leakage variant available for personal protection.

Cross-brand Equivalent Reference (Reference target: NV125-SV 3P 63A, AC400V, Icu≥30kA, adjustable leakage 100/200/500mA, termomagnetice)

⚠️ Important note: Physical size and accessories are NOT interchangeable; only electrical equivalent. Verify cabinet cutout, wiring and accessory interface for site retrofit. Table based on 63A/3P.

Marca	Model echivalent	Parametri cheie	Observații
Mitsubishi Original	NV125-SV 3P 63A	3P 63A, Icu=30kA@400V, AC leakage 100/200/500mA adjustable, deplasare termomagnetică	Reference unit, WS-V series
Schneider	EZD125E 3P 63A Vigi (leakage module)	3P 63A, Icu=30kA, adjustable residual current	EZD125E + separate Vigi module; split type leakage, not integrated ELCB; dimensiune diferită
Schneider	NSX100N 3P 63A Vigi	Icu=36kA, scurgere reglabilă	NSX higher performance, pret mai mare, modular leakage
ABB	T2N160 3P 63A RCD	Icu=36kA, adjustable AC residual current	MCCB body + external RCD module, integrated solution Tmax T2N
Siemens	3VT8106-1AA03-0AA0 + leakage trip module	3P 63A, Icu=25kA, optional leakage module	Breaking capacity slightly lower than Mitsubishi; check short-circuit capacity
îngrijit	NM1LE-125S/3P 63A	3P 63A, Icu=35kA, leakage 100/200/500mA adjustable	Main domestic alternative, integrated ELCB, termomagnetice, similar mounting size
Delicios	CDM1LE-125/3P 63A	3P 63A, Icu=35kA, multi-level adjustable leakage	Alternativă internă, 125AF frame, scurgere integrată
Oamenii electrici	RMM1LE-125/3P 63A	3P 63A, Icu=35kA, scurgere reglabilă	Alternativa casnica economica

Key Differences for Replacement Engineering

Leakage construction: Mitsubishi NV125-SV is integrated built-in leakage. Schneider NSX/EZD and ABB Tmax mostly adopt separate external leakage modules, more failure points.
Capacitate de rupere: NV125-SV Icu=30kA; Icu cannot be downgraded during replacement, risk of breaker failure under bus short-circuit.
Compatibilitate cu accesorii: Mitsubishi AX/AL/SHT/UVT are right-side clip-on modules; Schneider/ABB accessories are independent modules. Mitsubishi old accessories cannot be reused, new accessories must be purchased for retrofit.
Selectarea stâlpului: 3P only switches 3 live conductors, neutral passes through. Select 4P if neutral protection is required.
Tip de scurgere: Above are all AC type, suitable for standard power frequency loads. For VFD-heavy systems, A/F type leakage is recommended.

Mitsubishi Legacy to WS-V Upgrade

Old NV125-SW / NV125-SVL (old WS series) → NV125-SV (WS-V)

Same outer dimension, mounting hole compatible

Higher short-circuit breaking capacity (old 25kA upgraded to 30kA)

Updated accessory model: old SW accessories incompatible with SV; must use -03SVU series (TOPOR-03SVU / AL-03SVU)

Recommended Replacement Priority

Cabinet space & accessory reuse preferred: Original Mitsubishi NV125-SV
Import equivalent upgrade: ABB T2N160 / Schneider NSX100N Vigi
Cost-effective domestic engineering replacement: CHNT NM1LE-125S / Delixi CDM1LE-125

NV125-SV 3P 63A Replacement Retrofit Risk Checklist

Domeniul de aplicare: Replace Mitsubishi NV125-SV 3P 63A (ELCB, AC400V, Icu=30kA, 100/200/500mA adjustable leakage) with identical model, imported equivalent (ABB/Schneider/Siemens) or domestic alternative (CHNT/Delixi/People). Used for ECN, technical briefing, incoming inspection and pre-commissioning check. ✅=Pass; ❌=Fail; ⚠️=Requires confirmation/rectification

Verificarea parametrilor electrici (Cea mai mare prioritate, No Icu Downgrade)

Nu.	Element de verificare	Cerinţă / Criterion
1	Rated Current In	New device ≥ 63A and matches circuit design; continuous load ≤0.8×In
2	Pole Consistency	Original 3P must use 3P; if changing to 4P for neutral switching, rework wiring & cabinet cutout
3	Rated Voltage Ue	New device rated voltage ≥ AC400V, compatible with system voltage
4	Short-circuit Breaking Icu@AC400V	New Icu ≥ 30kA (must not be lower than original NV125-SV 30kA), risk of breaker damage under bus short-circuit
5	Ics (Capacitatea de întrerupere a serviciului)	≥30kA, same as Icu, allows reclose after short-circuit event
6	Earth Leakage Protection Type	tip AC (or A/F type); adjustable leakage range 100/200/500mA must be retained
7	Timp de funcționare de scurgere	≤0.04s (de mare viteză); separately verify for 30mA personal protection version
8	Thermal-Magnetic Trip Characteristic	Supraîncărcare / short-circuit trip curve must match original coordination; electronic trip requires setting verification
9	Short-circuit Selectivity	Recheck selectivity coordination with upstream and downstream protective devices

⚠️ Red Line Rule①: Do NOT energize any replacement unit with Icu <30cel. Leave panel de-energized rather than downgrade breaking capacity.

Instalare mecanică & Dimension Check

Nu.	Element de verificare	Cerinţă / Criterion
1	Decupaj de montare	Compare original NV125-SV (W90×H130×D90mm) with cabinet cutout; re-cut or use adapter plate if dimension mismatch
2	Tip de montare	TH35 DIN rail or panel bolt mounting compatible with original bracket
3	Spațiu de cablare	In/out terminal clearance sufficient for cable stripping and crimping (meet minimum cable bending radius)
4	Phase Clearance	Creepage & air clearance between phase terminals comply with new device specification
5	Disiparea căldurii	Panel spacing meets thermal requirement; no tight side-by-side mounting with internal accessories fitted (UVT especially)
6	Mâner / Door Cutout	Door opening and handle projection match new device; confirm if external rotary handle needs replacement
7	Torque for Terminals	Tightening torque follows manufacturer manual; conductor cross-section adequate, crimping secure

⚠️ Red Line Rule②: Do not force oversized cutout or suspend breaker without proper support. Use manufacturer drawing or adapter plate.

Accessory Compatibility Check (High Risk, Frequently Missed)

Nu.	Element de verificare	Cerinţă / Criterion
1	Accessory Interface	Original AX-03SVU / AL-03SVU / SHTA/D / UVTN/S cannot be fitted to other brands; purchase new accessories matching new breaker brand
2	Alarma / Position Signal	Re-select equivalent ALAX accessory for new breaker and rewire secondary circuit
3	Shunt Trip SHT	Reconfigure remote trip, verify AC/DC voltage rating
4	Under Voltage Trip UVT	Reconfigure UVT; verify trip characteristic (synchronous / non-synchronous) against load type
5	Mechanical Interlock MI	Dual power interlock must be matched accessory from new brand; interlocks from different brands are incompatible
6	Capac terminal / Lockout	Fit TC/LC protective accessories as per new device spec
7	External Leakage Module (Import Split Type)	Schneider NSX/EZD, ABB T2N use separate leakage module; confirm module installed and wired correctly

⚠️ Red Line Rule③: Do NOT reuse old Mitsubishi accessories on new breakers. Mismatched assembly causes poor contact, loss of alarm or protection function.

Principal & Secondary Wiring Check

Nu.	Element de verificare	Cerinţă / Criterion
1	Cablajul circuitului principal	Phase sequence matches busbar, terminals fully tightened
2	Neutral Handling	3P version neutral passes through unswitched; rewire neutral if replaced with 4P
3	Zero-sequence CT / Leakage Transformer	Integrated ELCB has built-in CT, no external CT needed; check CT cable passing direction for split leakage module
4	Secondary Control Wires	AX/AL contacts to PLC / indicator circuit; verify contact type (1a1b) and voltage rating
5	Shunt / UVT Coil Wiring	SHT is short-time energized, continuous power forbidden; UVT coil voltage matches supply
6	Wiring Marking	Phase labels and accessory terminal numbers clear and consistent with drawing
7	Terminal Torque	Follow manufacturer torque specification to avoid overheating / conexiune slabă

⚠️ Red Line Rule④: SHT coil is short-time energized, continuous supply burns coil. UVT will not auto-close after voltage recovery; manual closing required in commissioning procedure.

Pre-commissioning Test & Acceptance

Nu.	Element de verificare	Cerinţă / Criterion
1	Insulation Test	Phase-to-phase / phase-earth insulation resistance meets requirement; disconnect secondary / electronic accessories before test
2	Leakage Test (TEST Button)	Press red TEST button; breaker must trip reliably to validate leakage protection
3	Leakage Threshold Verification	Test tripping at 100/200/500mA if site conditions permit
4	Supraîncărcare / Short-circuit Simulation	Verify thermal-magnetic trip if test available; otherwise confirm factory trip characteristic
5	Accessory Function Test	Test ALAX alarm contact, SHT remote trip, UVT under-voltage trip one by one
6	Mechanical Operation	Manual ON/OFF smooth, no jamming, no missing phase
7	No-load & Load Trial Run	Close breaker under no-load first; then energize load, monitor temperature and nuisance tripping
8	Earthing Continuity	Equipment and cabinet protective earth secure
9	Setting Record Filing	Document new breaker rating, leakage setting and accessory configuration

⚠️ Red Line Rule⑤: Do NOT put into formal operation before passing TEST button leakage verification. ELCB without working leakage protection functions only as ordinary MCCB, no personnel protection.

Condiții inaplicabile & Operațiuni interzise

Scenariu / Operațiunea	Judgement
Frequent ON/OFF cycling	⚠️ Thermal-magnetic trip not suitable for high cycle rate; use motor protector or add contactor
Heavy corrosion, praf, condensare	❌ Standard model not suitable; IP rated enclosure + anti-condensation heater required
VFD & servo heavy harmonic environment	⚠️ AC type may nuisance trip; upgrade to A/F type leakage or surge-resistant model
Replace breaker with upstream live	❌ Live working prohibited. Opriți, test dead, lockout-tagout (INIMA) necesar
Reset immediately after leakage trip without investigation	❌ Do not repeatedly reclose; troubleshoot insulation/earth fault first
Replace ELCB with standard MCCB (NF)	❌ Loss of earth leakage protection, strictly prohibited
Replace with lower Icu rating	❌ Not allowed