ABB VSC/P 7.2-400A 120VAC DCO NST DC Circuit Breaker

### **Introduction to ABB VSC/P 7.2-400A 120VAC DCO NST DC Circuit Breaker**

#### **1. Product Overview**

- **Model**: VSC/P 7.2-400A 120VAC DCO NST

- **Series**: ABB VSC Series DC Circuit Breaker

- **Application**: Protection for photovoltaic systems, energy storage systems, and DC distribution networks

- **Certifications**: UL 508A, IEC 60947-2

#### **2. Key Specifications**

| Parameter | Specification |

|-----------|--------------|

| **Rated Voltage** | 120V DC |

| **Rated Current** | 400A |

| **Breaking Capacity** | 7.2kA (DC) |

| **Number of Poles** | 1P |

| **Operation Method** | Manual operation |

| **Wiring Method** | Top/bottom wiring |

#### **3. Technical Features**

- **DC-Specific Design**: Optimized arc extinguishing performance, specially designed for DC circuits

- **Fast Tripping**: Response time <10ms

- **Visual Status Indication**: Mechanical ON/OFF indicator

- **Compact Design**: Saves installation space

- **Wide Temperature Range**: -25°C to +70°C

#### **4. Typical Applications**

- DC side protection for photovoltaic power generation systems

- Battery energy storage system protection

- DC protection for electric vehicle charging stations

- Industrial DC distribution systems

#### **5. Installation Instructions**

- **Mounting Method**: Standard 35mm DIN rail mounting

- **Torque Requirement**: Terminal tightening torque 15-20Nm

- **Electrical Clearance**: ≥10mm

- **Protection Class**: IP20 (can reach IP40 after installation)

#### **6. Optional Accessories**

- Auxiliary contact module

- Motorized operating mechanism

- Alarm contact module

- Special arc chute

#### **7. Precautions**

- For DC circuits only

- Must be installed by qualified electricians

- Regularly check contact status

- Not for use in humid environments

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