Types of Molded Case Circuit Breakers: MCCB Guide for Engineers
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- Part number
- C40N31M320
- Model no
- NSX400N
Schneider Electric C40N31M320 ComPacT NSX400N 3P 320 A 50 kA MicroLogic 1.3 M Moulded Case Circuit Breaker
ComPacT NSX400N 3P 320 A motor-protection MCCB, 50 kA Icu, MicroLogic 1.3 M.
Description
About the NSX400N
About the NSX400N
The C40N31M320 is a Schneider Electric ComPacT NSX400N 3-pole moulded case circuit breaker for motor-circuit protection, rated 320 A at 65 °C with a 50 kA breaking capacity (Icu) at 380/415 V AC. Its MicroLogic 1.3 M trip unit gives fixed instantaneous and adjustable short-time protection only, for pairing with a separate overload relay.
Certifications & Standards
- EN/IEC 60947-2
Selection Notes
The MicroLogic 1.3 M trip unit provides only short-time (S) and fixed instantaneous (I) protection — it has no adjustable long-time stage, so C40N31M320 is meant to pair with a separate motor overload relay or thermal-magnetic starter rather than protect the motor on its own. Use a 2.3 M variant of the same frame instead when a single device needs to combine adjustable overload protection with the motor-circuit breaker function. At 50 kA Icu at 380/415 V AC, the frame covers starter coordination up to that fault level.
Specification
Full specification
Main 20
| Range | ComPacT |
|---|---|
| Product name | ComPacT NSX |
| Device short name | NSX400N |
| Product or component type | Circuit breaker |
| Device application | Motor protection |
| Poles description | 3P |
| Protected poles description | 3D |
| [In] rated current | 320 A at 65 °C |
| [Ue] rated operational voltage | 690 V AC 50/60 Hz |
| Network type | AC |
| Network frequency | 50/60 Hz |
| Suitability for isolation | Yes conforming to EN/IEC 60947-2 |
| Utilisation category | Category A |
| Breaking capacity | 85 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2, 50 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2, 42 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2, 30 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2, 22 kA Icu at 525 V AC 50/60 Hz conforming to IEC 60947-2, 10 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2, 85 kA Icu at 240 V AC 50/60 Hz conforming to UL 60947-4-1, 50 kA Icu at 480 V AC 50/60 Hz conforming to UL 60947-4-1, 20 kA Icu at 600 V AC 50/60 Hz conforming to UL 60947-4-1 |
| Breaking capacity code | N 50 kA 415 V AC |
| Trip unit name | MicroLogic 1.3 M |
| Trip unit technology | Electronic |
| Trip unit protection functions | SI |
| Control type | Toggle |
| Circuit breaker mounting mode | Fixed |
Complementary 26
| [Ui] rated insulation voltage | 800 V AC 50/60 Hz |
|---|---|
| [Uimp] rated impulse withstand voltage | 8 kV |
| [Ics] rated service breaking capacity | 85 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2, 50 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2, 42 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2, 30 kA at 500 V AC 50/60 Hz conforming to IEC 60947-2, 11 kA at 525 V AC 50/60 Hz conforming to IEC 60947-2, 10 kA at 660/690 V AC 50/60 Hz conforming to IEC 60947-2 |
| Mechanical durability | 15000 cycles |
| Electrical durability | 12000 cycles at 440 V In/2, 6000 cycles at 440 V In, 6000 cycles at 690 V In/2, 3000 cycles at 690 V In |
| Power dissipation per pole | 12.29 W |
| Mounting support | Backplate |
| Mounting position | Horizontal and vertical, Flat on the back |
| Upside connection | Front |
| Downside connection | Front |
| Connection pitch | 45 mm |
| Protection type | S : for short time short-circuit protection, I : for instantaneous short-circuit protection |
| Trip unit rating | 320 A at 65 °C |
| Short-time protection pick-up adjustment type Isd | Adjustable 9 settings |
| [Isd] Short-time protection pick-up adjustment range | 1600 A, 1920 A, 2440 A, 2560 A, 2880 A, 3200 A, 3520 A, 3840 A, 4160 A |
| Short-time protection delay adjustment type tsd | Fixed |
| Instantaneous protection pick-up adjustment type Ii | Fixed |
| [Ii] instantaneous protection pick-up adjustment range | 4800 A |
| Earth-leakage protection | Without |
| Zone selective interlocking ZSI | Without |
| Number of slots | 6 slot(s) |
| Local signalling | Flashing LED (green) for ready to operate |
| Width (W) | 140 mm |
| Height (H) | 255 mm |
| Depth (D) | 110 mm |
| Net weight | 6.05 kg |
Environment 10
| Standards | EN/IEC 60947-2 |
|---|---|
| Overvoltage category | III |
| Electrical shock protection class | Class II on front face |
| 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 80 specifications ↓ Show less ↑24 more values in Identification, Contractual warranty, Logistics.
Identification 7
| Part number | C40N31M320 |
|---|---|
| Type designation | NSX400N |
| 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 16
| Unit Type of Package 1 | PCE |
|---|---|
| Number of Units in Package 1 | 1 |
| Package 1 Height | 15.200 cm |
| Package 1 Width | 15.500 cm |
| Package 1 Length | 29.200 cm |
| Package 1 Weight | 5.588 kg |
| Unit Type of Package 2 | S04 |
| Number of Units in Package 2 | 2 |
| Package 2 Height | 30.000 cm |
| Package 2 Width | 40.000 cm |
| Package 2 Length | 60.000 cm |
| Package 2 Weight | 11.761 kg |
| Shipping weight | 6.05 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for C40N31M320
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 NSX400N
What is the rated current of NSX400N?
The rated current of NSX400N is 320 A.
Which supply voltage is NSX400N rated for?
The rated operational voltage of NSX400N is 690 V AC.
What is the HS code of NSX400N for customs?
The tariff (HS) code on file for NSX400N is 85362090.
Where does NSX400N ship from, and how fast?
NSX400N 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
