Types of Molded Case Circuit Breakers: MCCB Guide for Engineers
Compare MCCB types including thermal-magnetic, electronic trip, motor protection, current-limiting, and DC-rated units for industrial use. Shop at Stoklink.
- Part number
- C40F4TM250D
- Model no
- NSX400F DC
Schneider Electric C40F4TM250D ComPacT NSX250F DC 4P 250 A 36 kA TM-DC Fixed Moulded Case Circuit Breaker
ComPacT NSX250F DC MCCB, 4P 250 A, 36 kA at 750 V DC, TM-DC trip unit.
Description
About the NSX400F DC
About the NSX400F DC
The Schneider Electric C40F4TM250D is a 4-pole ComPacT NSX250F DC moulded case circuit breaker rated 250 A on a TM-DC thermal-magnetic trip unit for DC distribution. Breaking capacity (Icu) is 36 kA DC at 750 V DC across 3 poles in series, with both thermal overload and magnetic short-circuit pick-up adjustable on the trip unit.
Certifications & Standards
- EN/IEC 60947-2
Selection Notes
Unlike the AC TM-D trip unit, the TM-DC fits both the thermal overload (Ir, 0.7-1 x In) and the magnetic instantaneous pick-up (2.5-5 x In) with field adjustment, which matters on DC circuits where fault current does not fall to zero each half-cycle and the magnetic trip threshold needs tuning to the installation. The 750 V DC rating is reached with all 3 poles wired in series; pick the 250 A rating to match the DC bus or PV array current, and choose a different sibling in the same TM-DC series for a higher or lower current without changing the 36 kA breaking capacity.
Specification
Full specification
Main 19
| Range | ComPacT |
|---|---|
| Product name | ComPacT NSX DC |
| Device short name | NSX400F DC |
| Product or component type | Circuit breaker |
| Device application | Distribution |
| Poles description | 4P |
| Protected poles description | 4D |
| [In] rated current | 250 A at 40 °C |
| [Ue] rated operational voltage | 750 V DC |
| Network type | DC |
| Suitability for isolation | Yes conforming to EN/IEC 60947-2 |
| Utilisation category | Category A |
| Breaking capacity | 36 kA Icu at 24...125 V DC 1 pole conforming to IEC 60947-2, 36 kA Icu at 250 V DC 1 pole conforming to IEC 60947-2, 36 kA Icu at 500 V DC 2 poles in series conforming to IEC 60947-2, 36 kA Icu at 750 V DC 3 poles in series conforming to IEC 60947-2 |
| Breaking capacity code | F 36 kA 750 V DC |
| Trip unit name | TM-DC |
| Trip unit technology | Thermal-magnetic |
| Trip unit protection functions | LI |
| Control type | Toggle |
| Circuit breaker mounting mode | Fixed |
Complementary 22
| [Ui] rated insulation voltage | 750 V DC conforming to IEC 60947-2 |
|---|---|
| [Uimp] rated impulse withstand voltage | 8 kV conforming to IEC 60947-2 |
| [Ics] rated service breaking capacity | 36 kA at 24...125 V DC conforming to IEC 60947-2, 36 kA at 250 V DC conforming to IEC 60947-2, 36 kA at 500 V DC conforming to IEC 60947-2, 36 kA at 750 V DC conforming to IEC 60947-2 |
| Mechanical durability | 5000 cycles |
| Electrical durability | 2000 cycles at 750 V In/2, 1000 cycles at 750 V In |
| Mounting support | Backplate |
| Mounting position | Horizontal and vertical, Flat on the back |
| Upside connection | Front |
| Downside connection | Front |
| Connection pitch | 45 mm |
| Protection type | L : for overload protection (thermal), I : for short-circuit protection (magnetic) |
| Trip unit rating | 250 A at 40 °C |
| Long-time pick-up adjustment type Ir (thermal protection) | Adjustable |
| [Ir] long-time protection pick-up adjustment range | 0.7...1 x In |
| Instantaneous protection pick-up adjustment type Ii | Adjustable |
| [Ii] instantaneous protection pick-up adjustment range | 2.5...5 x In |
| Earth-leakage protection | Without |
| Number of slots | 6 slot(s) |
| Width (W) | 185 mm |
| Height (H) | 255 mm |
| Depth (D) | 110 mm |
| Net weight | 8.4 kg |
Environment 8
| Standards | EN/IEC 60947-2 |
|---|---|
| Pollution degree | 3 conforming to IEC 60664-1 |
| IP degree of protection | IP40 conforming to IEC 60529 |
| IK degree of protection | IK07 conforming to IEC 62262 |
| Ambient air temperature for operation | -25…70 °C |
| Ambient air temperature for storage | -50…85 °C |
| Relative humidity | 0…95 % |
| Operating altitude | 0...2000 m without derating, 2000 m...5000 m with derating |
Show all 79 specifications ↓ Show less ↑30 more values in Identification, Contractual warranty, Logistics.
Identification 7
| Part number | C40F4TM250D |
|---|---|
| Type designation | NSX400F DC |
| Brand | Schneider Electric |
| Condition | New, factory sealed |
| Source | Schneider Electric and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
Contractual warranty 1
| Warranty (in months) | 18 |
|---|
Logistics 22
| Unit Type of Package 1 | PCE |
|---|---|
| Number of Units in Package 1 | 1 |
| Package 1 Height | 14.700 cm |
| Package 1 Width | 20.000 cm |
| Package 1 Length | 29.100 cm |
| Package 1 Weight | 7.000 kg |
| Unit Type of Package 2 | S03 |
| Number of Units in Package 2 | 2 |
| Package 2 Height | 30 cm |
| Package 2 Width | 30 cm |
| Package 2 Length | 40 cm |
| Package 2 Weight | 14.420 kg |
| Unit Type of Package 3 | P12 |
| Number of Units in Package 3 | 16 |
| Package 3 Height | 45.000 cm |
| Package 3 Width | 80.000 cm |
| Package 3 Length | 120.000 cm |
| Package 3 Weight | 127.360 kg |
| Shipping weight | 8.4 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for C40F4TM250D
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- EN/IEC 60947-2
Quick answers
Questions about the NSX400F DC
What is the rated current of NSX400F DC?
The rated current of NSX400F DC is 250 A.
What is the HS code of NSX400F DC for customs?
The tariff (HS) code on file for NSX400F DC is 85362090.
Where does NSX400F DC ship from, and how fast?
NSX400F DC ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Guides
Guides for MCCB
How to Select the Right MCCB for Your Application: Engineer Checklist
Select the right MCCB with our engineer checklist covering IEC 60947-2, sizing, breaking capacity, trip units, and derating for industry. Shop at Stoklink.
IEC 60947-2 Standards for Molded Case Circuit Breakers Explained
IEC 60947-2 defines MCCB ratings Icu, Ics, Icw, utilization categories A and B, and type tests for low-voltage circuit breakers up to 1000V. Shop...
Reviews
Customer reviews
Series
Schneider Electric Schneider ComPacT NSX
- Brand
- Schneider Electric
- Series
- Schneider ComPacT NSX
