ABB VD4/Z-24-25-25

**Introduction to ABB VD4/Z-24-25-25 Vacuum Circuit Breaker**  

**1. Basic Overview**  

- **Model**: VD4/Z-24-25-25  

- **Type**: Medium-voltage vacuum circuit breaker (VCB)  

- **Rated Voltage**: 24 kV  

- **Rated Current**: 2500 A  

- **Short-Circuit Breaking Capacity**: 25 kA  

- **Applications**: Suitable for power distribution systems, industrial power equipment, substations, and medium-voltage switchgear (e.g., KYN28A-24, UniGear ZS1).  

**2. Key Technical Parameters**  

| Parameter | Specification |  

|-----------|--------------|  

| **Rated Voltage (Uₙ)** | 24 kV |  

| **Rated Current (Iₙ)** | 2500 A |  

| **Rated Short-Circuit Breaking Current (Iₖₐ)** | 25 kA |  

| **Rated Short-Time Withstand Current (Iᶜʷ)** | 25 kA (3s) |  

| **Rated Peak Withstand Current (Iₚₖ)** | 63 kA |  

| **Mechanical Life** | 30,000 operations |  

| **Electrical Life** | 10,000 operations (at rated current) |  

| **Operating Mechanism** | Spring-operated (motor/manual charging optional) |  

| **Protection Rating** | IP4X (standard for panel mounting) |  

**3. Core Features**  

a. **Vacuum Interruption Technology**: Uses vacuum interrupters—SF₆-free, environmentally friendly, and maintenance-free.  

b. **High Reliability**: ABB's proven design for frequent switching and high short-circuit current applications.  

c. **Modular Structure**: Easy installation and maintenance, compatible with various switchgear (e.g., ABB UniGear, ZS3.2).  

d. **Smart Control Options**: Supports integration with intelligent protection devices (e.g., REF615, REJ601) and remote monitoring.  

e. **Low Energy Consumption**: Spring-operated mechanism with fast motor charging (≤15s).  

**4. Typical Applications**  

- **Industrial Power Systems**: Steel plants, chemical factories, data centers (24kV power distribution protection).  

- **Renewable Energy**: Collector line protection for wind and solar farms.  

- **Public Infrastructure**: Backup power switching for hospitals, airports, and metro systems.  

**5. Options & Configurations**  

- **Operation Mode**: Motorized (DC 110V/220V), manual, or motor charging.  

- **Auxiliary Contacts**: Standard 4NO+4NC, expandable.  

- **Interlocking**: Mechanical/electrical interlocks for safe operation.  

- **Optional Accessories**:  

  - Earthing switch (VD4E)  

  - Position sensors (for status monitoring)  

  - Smart controllers (IEC 61850 communication support)  

**6. Maintenance & Certifications**  

- **Maintenance Interval**: Recommended inspection of interrupters and mechanical parts every 5 years or 10,000 operations.  

- **Certifications**: Complies with IEC 62271, GB/T 1984, and other international standards.  

**Conclusion**  

The ABB **VD4/Z-24-25-25** is a high-performance 24kV vacuum circuit breaker designed for demanding industrial and power environments, offering high breaking capacity, long service life, and smart functionality. If you need this product, feel free to contact us!