ABB EHDB280-21-11 Direct Current Contactor

Description

Technical Specifications

• Product Type: Three-Pole Direct Current Contactor
• Rated Operational Current (AC-1 / DC-1): 280 A (690 V AC / 600 V DC)
• Number of Poles: 3 poles (2 Normally Open, 1 Normally Closed)
• Auxiliary Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)
• Rated Control Voltage: 110 V AC (50 Hz) / 120 V AC (60 Hz)
• Operating Voltage Range: 85% – 110% of rated control voltage
• Maximum Insulation Voltage: 600 V DC
• Power Rating: 75 HP (240 V DC), 150 HP (500 V DC), 200 HP (600 V DC)
• Contact Configuration:
  • Main Contacts: Double-break contact design
  • Auxiliary Contacts: Low-energy type (17 V, 5 mA)
• Dimensions (W × H × D): 136 mm × 198 mm × 169 mm
• Weight: 3.7 kg
• Mounting: Standard DIN rail mounting or direct panel mounting
• Terminal Type: Main circuit: Bar-type terminals; Connectable wire size: 5 – 250 kcmils
• Operating Temperature: -40 °C to +70 °C
• Storage Temperature: -55 °C to +85 °C
• Relative Humidity: 5% – 95% RH (non-condensing)
• Protection Degree: IP20 (touch-safe terminals)
• Certifications: UL listed, CSA approved, CE compliant
• Mechanical Durability: Minimum 10 million operations
• Electrical Durability: Minimum 1 million operations at full rated load

Key Features & Benefits

1. High-Performance DC Switching Capacity
   • Delivers a rated current of 280 A and supports up to 600 V DC circuits, handling heavy-duty industrial DC loads with high efficiency.
   • Features double-break main contacts for superior arc extinction and rapid contact separation, ensuring safe DC switching.
   • Provides high horsepower ratings (up to 200 HP) for large-scale DC motor and drive control.
   • Optimized contact materials reduce wear and ensure stable low contact resistance throughout the service life.
2. Advanced Design & Construction
   • Compact, space-saving form factor optimizes control panel space utilization while maintaining high power density.
   • Touch-safe design fully protects all connection terminals against accidental contact, enhancing operator safety.
   • Captive terminal screws prevent loss during wiring and maintenance, ensuring secure connections.
   • Removable arc chute enables quick inspection and easy replacement of contacts, simplifying maintenance.
3. Flexible & Reliable Operation
   • Operates reliably over an extended voltage range (85% – 110% of rated control voltage), adapting to voltage fluctuations.
   • Mechanically robust construction withstands high levels of vibration and shock in heavy industrial environments.
   • Supports fast, snap-on DIN rail mounting for quick and tool-free installation.
   • Offers wide temperature tolerance, performing consistently in extreme industrial environments from -40 °C to +70 °C.
4. Comprehensive Auxiliary Functions
   • Integrated 1 NO + 1 NC auxiliary contacts support control circuit interlocking, status indication, and system feedback.
   • Low-energy auxiliary contacts ensure precise signal transmission with minimal power consumption.
   • Compatible with mechanical interlocking accessories for reversing application configurations.
   • Supports front-mounted snap-on accessories for expanded functional configurations.
5. Superior Durability & Safety
   • Extremely long mechanical life (10 million+ operations) and electrical life (1 million+ operations) minimize replacement frequency.
   • Strict compliance with UL, CSA, and CE standards ensures global applicability and adherence to safety regulations.
   • Designed for consistent performance under high switching frequencies and heavy cyclic loads.
   • High insulation and dielectric strength prevent electrical breakdown and ensure safe isolation between circuits.

Application Scenarios

• DC Motor Control Systems
  • Main circuit control for large DC motors in cranes, hoists, and winches.
  • Speed control and reversing switching for electric vehicle drive systems.
  • Starting and stopping control for industrial DC drives in metal processing and mining machinery.
  • Dynamic braking control for elevators, conveyors, and material handling equipment.
• Industrial Power Distribution
  • Switching and protection for high-power DC power supply units and battery banks.
  • Main circuit control in DC uninterruptible power supply (UPS) systems.
  • Isolation switching for photovoltaic (PV) solar power DC systems.
  • Power distribution control in industrial DC microgrids and energy storage systems.
• Metals & Mining Industry
  • Control for rolling mills, smelting equipment, and electrolytic processing machinery.
  • DC power switching for mining shovels, draglines, and ore processing equipment.
  • Safety isolation and emergency stopping for heavy-duty mining machinery.
  • Control systems for steel production and metal fabrication equipment.
• Marine & Offshore Applications
  • Main power control for marine DC propulsion systems.
  • Switching for offshore drilling equipment and subsea machinery power circuits.
  • Control of winches, windlasses, and deck machinery on commercial vessels.
  • Power distribution in shipboard electrical systems requiring high current DC switching.
• Rail & Transportation
  • Control for electric locomotive and light rail vehicle DC traction systems.
  • Switching for railway signaling and auxiliary power circuits.
  • Power control for mass transit vehicle drive and braking systems.
  • Isolation and protection for rail-side DC power distribution networks.
• General Industrial Automation
  • High-power DC circuit control in automated manufacturing lines.
  • Safety-related switching for emergency shutdown (ESD) systems in process industries.
  • Control for electroplating, electrolysis, and electrochemical processing equipment.
  • Power management for industrial robots and automated material handling systems.