Mitsubishi NV250-SV 3P 250A Earth Leakage MCCB

NV = Earth Leakage Circuit Breaker (ELCB); 250 = 250AF frame size; SV = Standard breaking capacity (S-class); 3P = 3-pole; In=250A; AC-type electronic residual current circuit breaker

✅ Core Technical Parameters

Frame size: 250AF, rated current 250A

Poles: 3P (3-pole, 3-phase 3-wire)

Rated operational voltage Ue: AC100～440V (compatible with AC380/400/415V)

Insulation voltage Ui: 440V; impulse withstand voltage Uimp: 6kV

Breaking capacity (AC400V): Icu=Ics=36kA

Earth leakage sensitivity: 3 adjustable levels: 100/200/500mA (select Instantaneous / Time-delayed type when ordering)

Trip unit: Thermal-magnetic trip (overload + short-circuit protection) + electronic residual current protection

Standards: IEC60947-2, GB/T14048.2, CE certified

Dimensions: W105mm × H165mm × D92mm; standard front wiring

Frequency: 50/60Hz

📌 Model Code Breakdown

NV: Earth Leakage Circuit Breaker (ELCB); NF = non-leakage standard MCCB

250: 250A frame size

SV: S-class Standard breaking capacity; other variants: CV (economic low breaking), HV (high breaking capacity, 50kA)

3P: 3-pole; 4P version available

Suffix: J = Instantaneous trip; D = Time-delayed trip (for selective protection against upstream tripping)

🧩 Optional Accessories (Interchangeable within the series)

Auxiliary switch (AX), Alarm switch (AL), Shunt trip (SHT), Undervoltage trip (UVT), Extended rotary handle, Rear terminal blocks, Terminal safety covers

📋 Model Selection & Replacement Options

1. Upgraded model within the same series: NV250-SEV (new WS-V generation, electronic adjustable overload trip, CCC certified, mainstream stock model for domestic projects)
2. High breaking capacity same-frame variant: NV250-HV (Icu=50kA @ AC400V)
3. Note: NV250-SV is an older imported model; NV250-SEV is the domestic mainstream stock model. Direct replacement requires verification of leakage current range, mounting dimensions and accessory interfaces.
4. Domestic alternative reference: Chint NM1LE-250S, Delixi CDM1LE-250 (similar breaking capacity and leakage logic, but cabinet cutout and accessories are not interchangeable)

⚠️ Application & Troubleshooting Tips

Application scenarios: Main incoming feeders in 3-phase power cabinets, fans, water pumps and production lines, with integrated overload, short-circuit and earth fault protection.

3P version only detects 3-phase leakage; single-phase 220V loads with neutral wire are not allowed. Select 4P if single-phase loads exist.

Common fault: Immediate tripping after closing. First distinguish between earth leakage trip (leakage indicator pops out) and overload/short-circuit trip. Adjust leakage setting to 500mA to avoid tripping caused by normal equipment residual current.

Maintenance test: Press the built-in leakage test button regularly to verify the residual current function.

📎 Complete Ordering Example

NV250-SV 3P 250A 100/200/500mA J (Instantaneous type)

Comparison Table: NV250-SV / NV250-SEV / NV250-HV (250AF frame, 3P 250A, AC-type ELCB)

All belong to WS-V series; mounting dimensions, cabinet cutouts and accessory interfaces are fully interchangeable for direct in-situ replacement.

Core differences: trip unit, breaking capacity and market positioning.

Full Model List of Mitsubishi WS-V Series MCCB

1. NF (Standard MCCB without earth leakage) & NV (ELCB with earth leakage) — Small & Medium Frames (32～250AF)

(1) 32AF Frame

NF (MCCB): NF32-SV (only S-class available)

NV (ELCB): NV32-SV

(2) 63AF Frame

NF: NF63-CV (economic), NF63-SV (standard), NF63-HV (high breaking)

NV: NV63-CV, NV63-SV, NV63-HV

(3) 125AF Frame (Most widely used)

1. Thermal-magnetic fixed trip: NF125-CV, NF125-SV, NF125-HV
2. Electronic adjustable trip: NF125-SEV, NF125-HEV
3. Current-limiting type: NF125-UV, NF125-RV

NV Earth Leakage Breakers: NV125-CV, NV125-SV, NV125-HV, NV125-SEV, NV125-HEV

(4) 250AF Frame (Your current model frame)

NF Standard MCCB (No leakage protection)

Thermal-magnetic: NF250-CV, NF250-SV, NF250-HV

Electronic adjustable: NF250-SEV, NF250-HEV

Current-limiting: NF250-RV, NF250-UV

NV Earth Leakage Circuit Breakers (ELCB, including NV250-SV)

NV250-CV (economic version)

NV250-SV (standard general model, your selected type)

NV250-HV (high breaking capacity, 50kA)

NV250-SEV (electronic adjustable overload)

NV250-HEV (electronic trip + high breaking capacity)

Leakage current settings: 100/200/500mA 3-level adjustable; J=Instantaneous, D=Time-delayed.

1. Large Current Frames (400～4000AF, Traditional WS Series)
2. 400AF: NF400-CW / SW / HW; NV400-CW / SW / HW
3. 630AF: NF630-CW / SW / HW; NV630-CW / SW / HW
4. 800～4000AF: NF800～NF4000, NV800～NV4000 (only thermal-magnetic trip; suffix = CW/SW/HW, no SV suffix)

III. Universal Accessory Cross Reference (32/63/125/250AF)

Conclusion: All accessories for NV250-SV are fully compatible with NF250-CV/SV/HV/SEV/HEV and can be retrofitted on site without factory modification.

1. UL Export Models (Suffix U)

NF125-SVU / HVU; NF250-CVU / SVU / HVU

NV125-SVU / HVU; NV250-CVU / SVU / HVU

1. Full Ordering Format
2. Standard type: NV250-SV 3P 250A J 100/200/500mA (Instantaneous trip)
3. Selective protection type: NV250-SV 3P 250A D (Time-delayed leakage trip)
4. Full set with accessories: NV250-SV 3P 250A + AX+AL+SHT(AC220V)+UVT(AC380V)
5. Old-to-New Model Replacement (WS → WS-V Series)

Old model NF250-SGW → New model NF250-SV

Old model NV250-SW → New model NV250-SV

Dimensions, cutouts and accessories are 1:1 interchangeable with no cabinet modification required