WhatsApp:+86 18150087953 WeChat: +86 18150087953 
Email：
Description
Application Scenarios
In a steel mill’s main rolling line DC drive system, the high-power DC motor requires a reliable armature supply with regenerative braking capability. Standard contactor-based switching struggles with rapid current interruption and precise control during speed reversals. The ABB SKKH280/20EH #68602203 is deployed here as part of the power converter bridge. Its thyristor handles controlled rectification for motoring torque, while the integrated diode provides a path for regenerative current during braking, dissipating energy back to the grid. The module’s high surge current rating (e.g., 420A peak) handles the intense mechanical load shocks during rolling, while its compact, isolated package simplifies heatsink mounting and reduces cabinet space compared to discrete devices.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | SKKH280/20EH #68602203 |
| Manufacturer | ABB |
| Part Number | 68602203 |
| Product Category | Thyristor/Diode Power Module |
| Circuit Configuration | Thyristor & Diode (Anti-Parallel) |
| Rated Average Current (ITAV) | 280 A |
| Repetitive Peak Off-State Voltage (VDRM) | 2000 V (Typical) |
| Peak Surge Current (ITSM) | Up to 420 A (Approx.) |
| Isolation Voltage (Visol) | 5 kV RMS |
| Operating Temperature Range | -40°C to +85°C (Junction: -40°C to +125°C) |
| Thermal Resistance (Junction-Case) | < 0.05 K/W (Typical) |
| Mounting Style | Bolt-on (Stud or Baseplate) |
| Weight | Approx. 1.2 kg |
Technical Principles and Innovative Values
- Innovation Point 1: Integrated Anti-Parallel Topology. The module’s internal integration of a thyristor and diode in an anti-parallel configuration is a key space-saving innovation. This design eliminates the need for external wiring of separate devices in AC switching or reversible DC applications, reducing parasitic inductance, improving reliability, and simplifying the assembly of three-phase bridge circuits in drives and rectifiers.
- Innovation Point 2: Advanced Isolation and Thermal Management. The SKKH280/20EH utilizes a high-strength dielectric isolation layer (typically ceramic like Al2O3 or AlN) between the silicon dies and the baseplate. This provides both excellent electrical isolation (up to 5kV) and efficient heat transfer, allowing the module to be mounted directly on a common heatsink without insulating washers, thereby minimizing thermal resistance and enabling higher power density.
- Innovation Point 3: Optimized for Harsh Environments. With an operating temperature range extending down to -40°C and a high surge current rating, this module is designed for the demanding conditions of heavy industry (mining, metals, cement). Its robust construction resists thermal cycling fatigue, a common failure mode in applications with frequent load changes.
Application Cases and Industry Value
- Case 1: Cement Plant Raw Mill DC Drive Retrofit. A cement plant was experiencing frequent failures of discrete thyristor assemblies in its raw mill DC drive due to dust, vibration, and thermal stress. After retrofitting the power stack with the ABB SKKH280/20EH #68602203 modules, the plant reported a significant reduction in unscheduled downtime. The modular design simplified maintenance, and the integrated diode handled the regenerative loads from the mill’s inertia more effectively, improving energy efficiency and drive reliability.
- Case 2: Chemical Plant High-Current Soft Starter. A chemical processing facility needed to upgrade the motor soft starter for a large high-inertia pump (400kW). The existing solution used discrete thyristors with complex snubber circuits. By implementing a soft starter built with SKKH280/20EH modules, the engineers achieved a more compact cabinet design. The module’s high di/dt and dv/dt tolerance reduced the need for external protection components, resulting in a more reliable and cost-effective solution that provided smooth, controlled acceleration for the critical pump motor.
