Types of Molded Case Circuit Breakers: MCCB Guide for Engineers
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- Part number
- C40H31M320
- Model no
- NSX400H
Schneider Electric C40H31M320 ComPacT NSX400H 3P 320 A 70 kA MicroLogic 1.3 M Moulded Case Circuit Breaker
ComPacT NSX400H MCCB, 3P 320 A, 70 kA at 415 V AC, MicroLogic 1.3 M motor-protection trip unit.
Description
About the NSX400H
About the NSX400H
The Schneider Electric C40H31M320 is a 3-pole ComPacT NSX400H moulded case circuit breaker for motor protection, rated 320 A on a MicroLogic 1.3 M electronic trip unit with a short-time (S) and instantaneous (I) electronic trip, with no built-in long-time overload function. Breaking capacity (Icu) is 70 kA at 380/415 V AC, with a 690 V AC rated operational voltage.
Certifications & Standards
- EN/IEC 60947-2
Selection Notes
The MicroLogic 1.3 M trip unit gives this NSX400H It provides no thermal overload (L) function of its own, so it is paired with a separate motor overload relay for thermal protection; use it where short-circuit and short-time protection is wanted ahead of a motor starter that already has its own overload device. At 70 kA Icu, the H-frame breaking capacity sets how close to the transformer the breaker can sit; choose the 2.3 M sibling in the same frame when the opposite combination of built-in overload and trip-class control is needed.
Specification
Full specification
Main 20
| Range | ComPacT |
|---|---|
| Product name | ComPacT NSX |
| Device short name | NSX400H |
| 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 | 100 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2, 70 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2, 65 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2, 50 kA Icu at 500 V AC 50/60 Hz conforming to IEC 60947-2, 35 kA Icu at 525 V AC 50/60 Hz conforming to IEC 60947-2, 20 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, 65 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 | H 70 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 | 100 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2, 70 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2, 65 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2, 50 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 | C40H31M320 |
|---|---|
| Type designation | NSX400H |
| 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 | 15.0 cm |
| Package 1 Width | 15.5 cm |
| Package 1 Length | 29.0 cm |
| Package 1 Weight | 5.679 kg |
| Unit Type of Package 2 | S04 |
| Number of Units in Package 2 | 2 |
| Package 2 Height | 30.0 cm |
| Package 2 Width | 40.0 cm |
| Package 2 Length | 60.0 cm |
| Package 2 Weight | 12.004 kg |
| Shipping weight | 6.05 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
Documents
Documents for C40H31M320
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 NSX400H
What is the rated current of NSX400H?
The rated current of NSX400H is 320 A.
Which supply voltage is NSX400H rated for?
The rated operational voltage of NSX400H is 690 V AC.
What is the HS code of NSX400H for customs?
The tariff (HS) code on file for NSX400H is 85362090.
Where does NSX400H ship from, and how fast?
NSX400H 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
