The Lambda/TDK EMI TCR20S50-2-D is an SCR phase-controlled regulated DC power supply engineered for industrial and commercial applications demanding stable, low-ripple DC output. This 1000 W unit delivers 0–20 V and 0–50 A with constant voltage and constant current regulation, automatic crossover between modes, and RFI reduction 1000× better than previous SCR designs, meeting VDE 875 Level N and VDE 871 Level A. The supply accepts 208/220/230 VAC three-phase input (190–253 VAC operating range, 47–63 Hz) and operates continuously from 0°C to 40°C. Fan-cooled with horizontal ducted airflow, it features high efficiency, low output ripple, and optional overvoltage protection. Output voltage and current temperature coefficients are 0.02%/°C and 0.03%/°C respectively. Dielectric withstand ratings reach 2500 V rms primary-to-secondary and chassis. Supports series/parallel master/slave operation for expanded power delivery. Top cover access simplifies maintenance of control circuits, magnetic components, rectifiers, and filter capacitors.
Technical Specifications
• Topology: SCR phase-controlled regulated DC power supply
• Output Rating: 0–20 V, 0–50 A (1000 W)
• Output Regulation: Constant voltage and constant current with automatic crossover
• Output Ripple: Low ripple (specification compliant with ±2% phase balance)
• Temperature Coefficient (Voltage): 0.02%/°C of maximum rated output voltage
• Temperature Coefficient (Current): 0.03%/°C of maximum rated output current
• Input: 208/220/230 VAC, 3-phase, 47–63 Hz; operating range 190–253 VAC
• Optional Inputs: 380 V 50 Hz, 415 V 50 Hz, 440–460–480 V (414–505 V), 240 V 60 Hz, 230 V 50 Hz, 200 V 50 Hz
• Operating Temperature: 0°C to 40°C continuous duty
• Storage Temperature: −40°C to +85°C
• Dielectric Withstand: 2500 V rms (primary-to-secondary and chassis) – Key Features • RFI reduction 1000× over previous SCR models; VDE 875 Level N and VDE 871 Level A compliant
• High operating efficiency with fan-cooled design and horizontal ducted airflow
• Thermostat protection for critical circuitry
• Terminal protection on input, output, and programming connections
• Optional overvoltage protection module available
• Series/parallel master/slave operation capability
• Phase balance requirement: ±2% phase-to-phase for ripple specification; larger deviations accommodated via on-site recalibration
• Input phase rotation sequence not required – Typical Applications • Industrial process control and automation
• Commercial DC power systems requiring stable, regulated output
• Laboratory and test bench DC power – Compatibility & Integration • Top-cover accessible circuit card assembly, rectifiers, filter capacitors, and control components
• Multiple standard and optional AC input configurations for flexible installation
