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
- C40S4TM320D
- Model no
- NSX400S DC
Schneider Electric C40S4TM320D ComPacT NSX400S DC 4P 320 A 100 kA TM-DC Fixed Moulded Case Circuit Breaker
ComPacT NSX400S DC 4P 320 A DC MCCB, 100 kA Icu, TM-DC trip unit.
Description
About the NSX400S DC
About the NSX400S DC
The C40S4TM320D is a Schneider Electric ComPacT NSX400S DC 4-pole DC moulded case circuit breaker rated 320 A at 40 °C and 750 V DC, with a 100 kA breaking capacity (Icu) across the full DC voltage range. Its TM-DC thermal-magnetic trip unit gives adjustable overload and short-circuit protection without electronic components.
Certifications & Standards
- EN/IEC 60947-2
Selection Notes
The TM-DC trip unit gives adjustable overload protection (Ir 0.7–1×In) and adjustable magnetic short-circuit protection (Ii 2.5–5×In) without electronic components, which keeps the device simple for DC distribution or photovoltaic combiner applications. The 100 kA breaking capacity stays constant from 24 V DC up to 750 V DC because the poles connect in series for the higher-voltage ratings — the series 3-pole connection is what delivers the full 100 kA at 750 V DC. Choose the 320 A rating over the other TM-DC variants in the same frame to match the DC feeder or string combiner current.
Specification
Full specification
Main 20
| Range | ComPacT |
|---|---|
| Product name | ComPacT NSX DC |
| Device short name | NSX400S DC |
| Product or component type | Circuit breaker |
| Device application | Distribution |
| Poles description | 4P |
| Protected poles description | 4D |
| Neutral position | Left |
| [In] rated current | 320 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 | 100 kA Icu at 24...125 V DC 1 pole conforming to IEC 60947-2, 100 kA Icu at 250 V DC 1 pole conforming to IEC 60947-2, 100 kA Icu at 500 V DC 2 poles in series conforming to IEC 60947-2, 100 kA Icu at 750 V DC 3 poles in series conforming to IEC 60947-2 |
| Breaking capacity code | S 100 kA 500 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 23
| [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 | 100 kA at 24...125 V DC conforming to IEC 60947-2, 100 kA at 250 V DC conforming to IEC 60947-2, 100 kA at 500 V DC conforming to IEC 60947-2, 100 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 | 320 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 |
| Long-time protection delay adjustment type tr | Fixed |
| 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 69 specifications ↓ Show less ↑18 more values in Identification, Contractual warranty, Logistics.
Identification 7
| Part number | C40S4TM320D |
|---|---|
| Type designation | NSX400S 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 10
| Unit Type of Package 1 | PCE |
|---|---|
| Number of Units in Package 1 | 1 |
| Package 1 Height | 14.7 cm |
| Package 1 Width | 20.0 cm |
| Package 1 Length | 29.1 cm |
| Package 1 Weight | 6.6 kg |
| Shipping weight | 8.4 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for C40S4TM320D
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 NSX400S DC
What is the rated current of NSX400S DC?
The rated current of NSX400S DC is 320 A.
What is the HS code of NSX400S DC for customs?
The tariff (HS) code on file for NSX400S DC is 85362090.
Where does NSX400S DC ship from, and how fast?
NSX400S 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
