Description
Key Technical Specifications
- Product Model: HCV-5HA
- Manufacturer: Toshiba
- System Platform: Medium Voltage Vacuum Contactor Series (2.4-7.2 kV applications)
- Rated Voltage: 7200 V maximum, suitable for 2.4 kV to 6.9 kV systems with high dielectric strength.
- Continuous Current Rating: 400 A, enabling sustained operation without overheating in demanding loads.
- Interrupting Capacity: 50 kA symmetrical, critical for fault clearance and protection coordination in industrial networks.
- Control Voltage: 120 V AC (50/60 Hz) standard, with electronic drive unit for efficient coil operation.
- Auxiliary Contacts: 3NO/3NC configuration, rated A600 for control circuit integration and status feedback.
- Mechanical Endurance: Up to 1,000,000 operations, ensuring long service life in frequent switching applications.
- Electrical Endurance: 250,000 operations at rated load, minimizing maintenance in motor starting duties.
- Operating Temperature Range: -5°C to +40°C, supporting reliable performance in typical industrial environments.
- Weight: Approximately 45 kg (fixed type), balanced for mounting in switchgear cubicles.
- Dimensions (H x W x D): Approx. 500 mm x 400 mm x 350 mm (varies by configuration), compact for retrofit into existing panels.
- Short-Time Withstand Current: 7 kA for 1 second, providing robustness during transient faults.
- Certifications: UL listed, CSA compliant, conforms to IEC 60470 and NEMA ICS standards for global installations.
- MTBF: High reliability due to vacuum interrupter design, exceeding 200,000 hours in standard conditions.
Technical Architecture & Functional Positioning
This contactor sits at the power control layer in medium voltage distribution systems, acting as the primary switching device between the supply and load equipment like motors or transformers. Its architecture centers on vacuum interrupters with axial magnetic field electrodes, which generate a diffuse arc during interruption, allowing high-current faults to be cleared rapidly without excessive contact erosion. The electronic drive unit replaces traditional economizer circuits, providing precise pulse-width modulation to the operating coil for reduced power consumption during hold-in and elimination of contact welding risks from inrush currents.
Key technologies include solid-state coil control that operates across a wide voltage range without component changes, integrated anti-chopping features to minimize surge voltages, and optional mechanical latching for fail-safe operation in critical circuits. These elements solve common challenges in air-break contactors, such as arc flash hazards, frequent maintenance due to contact wear, and higher operational noise. In vacuum technology, the sealed interrupters prevent oxidation and contamination, enabling millions of operations with minimal degradation—essential for applications requiring high-duty cycles like conveyor systems or pump motors.
From a system perspective, the non-reversing design integrates seamlessly into motor control centers, offering drawout options for quick replacement without de-energizing the entire lineup. This enhances uptime in continuous processes, while the high interrupting rating supports selective coordination with upstream breakers, reducing blackout scopes during faults.
Typical Application Scenarios
- Employed in petrochemical plants for starting and protecting medium voltage induction motors in hazardous areas, leveraging vacuum technology for arc-free operation.
- Integrated into mining operations for crusher and conveyor motor control, where high mechanical endurance withstands frequent start-stop cycles.
- Used as direct replacement for aging air-break contactors in utility substations, upgrading transformer switching without major panel modifications.
- Applied in water treatment facilities for pump motor isolation, benefiting from low maintenance and high reliability in humid environments.
- Supports steel mill retrofit projects, handling inductive loads with minimal surge generation to protect sensitive electronics.
Quality Standards & Testing Procedures
Medium voltage switchgear components demand uncompromising reliability, as failures can cascade into extensive outages or safety risks. Our protocol reflects this, treating each unit as mission-critical infrastructure with verification steps aligned to industry best practices.
Every contactor is processed through a structured regimen to confirm it meets or exceeds original performance, drawing from NETA maintenance guidelines and manufacturer data.
Visual Inspection & Cleaning
Examine vacuum interrupters for integrity, check main and auxiliary contacts for pitting or wear, inspect insulation barriers for cracks, and verify no loose connections or foreign debris. Clean with non-residue agents and compressed air to ensure optimal contact pressure and dielectric properties.
Live Testing
Mount on a calibrated medium voltage test bench and energize for minimum 48 hours, monitoring coil current, temperature rise on bus bars, and auxiliary contact stability to detect latent defects under simulated load.
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