Description
ABB EHDB280
Technical Specifications:
- Current Rating: Rated for continuous currents between 220 A and 960 A.
- Voltage Ratings: Features a 600 VDC making capacity and a 300 VDC breaking capacity.
- Pole Configuration: Available in 2-pole (2 N.O.) and 3-pole (2 N.O. & 1 N.C.) power pole configurations.
- Mechanical Life: Rated for 5 million mechanical cycles.
- Electrical Life: Rated for 1.5 million electrical cycles.
- Operating Frequency: Maximum operational frequency of 300 cycles per hour.
- Operating Temperature: Wide operating temperature range from -40°C to +70°C.
Functional Features:
- Arc Extinguishing: Utilizes a double-break contact design with a magnetic arc chamber to extinguish arcs in the shortest possible time.
- Auxiliary Contacts: Comes standard with 1 N.O. and 1 N.C. auxiliary contacts, expandable up to 8 total (4 N.O. & 4 N.C.).
- Withdrawble Coil: Models in this series feature extractable coils, facilitating easy maintenance and coil replacement without dismantling the entire contactor.
- Reversing Capability: Mechanically interlocked versions are available for reversing applications.
Application Scenarios:
- Heavy-duty DC motor drives in metallurgy, mining, and marine propulsion.
- Dynamic braking circuits and high-inertia load control.
- Elevator systems and heavy material handling equipment.
Performance Parameters:
- Control Voltage Range: Operates reliably over an extended voltage range of 85% to 110% of the rated control voltage.
- Auxiliary Contact Options: Early-make and late-break auxiliary contacts are available, alongside options meeting specific elevator standards.
Material Composition & Structural Features:
- Coil Design: Features a high-temperature encapsulated coil for enhanced durability.
- Arc Chute: Designed for easy removal, allowing quick inspection and replacement of contacts.
- Safety Design: Touch-safe design with all connection terminals protected against accidental contact.
- Certifications: UL and CSA approved for safety and performance.
Working Principle:
Upon receiving an electrical control signal, the energized coil generates a magnetic field that pulls the movable contacts against the stationary contacts, closing the circuit. The magnetic arc chamber forces the resulting arc into splitter plates to rapidly cool and extinguish it when the circuit is opened.
Installation Requirements:
- Mount securely on a flat, rigid panel using appropriate hardware.
- Ensure adequate clearance around the arc chute for safe heat dissipation and arc venting.
Usage Precautions:
- Strictly adhere to the specified 600 VDC making and 300 VDC breaking capacities to prevent contact welding or catastrophic failure.
- Regularly inspect the arc chute and contacts for wear, especially in high-cycle dynamic braking applications.
