Product Description

Model Number Interpretation

• 411027: Base part number for Reliance’s high‑power disk thyristor series, indicating a standard hockey‑puck form factor and epoxy encapsulation.

• 65: Denotes 650 A average on‑state current and 1600 V peak reverse voltage (PRV) rating.

• A: Designates revision level and packaging variant, with enhanced thermal cycling resistance and industrial‑grade sealing.

Technical Specifications

• Device Type: Disk‑type (hockey puck) phase‑control thyristor (SCR), double‑sided cooled.

• Average On‑State Current (It avg): 650 A (continuous, case temp ≤85°C).

• Peak Reverse Voltage (Vrrm/Vdrm): 1600 V.

• Surge Current (Itsm): 12 kA (non‑repetitive, 10 ms half‑cycle).

• Gate Trigger Voltage (Vgt): 2.5 V (typical).

• Gate Trigger Current (Igt): 180 mA (typical).

• Operating Frequency: 50/60 Hz (line frequency).

• Thermal Resistance: 0.07°C/W (junction to case, double‑sided cooling).

• Junction Operating Temperature: −40°C to +125°C.

• Mounting: Pressure‑clamped between two flat heat sinks (double‑sided heat dissipation).

• Enclosure: Epoxy‑encapsulated, copper‑alloy base, rugged aluminum housing.

• Weight: Approximately 2.0 kg.

Interface and Communication Configuration

• Power Terminals: Two main high‑current terminals (anode/cathode) for AC/DC busbar connection; central gate terminal for control signals.

• Control Interface: Gate terminal accepts low‑power DC trigger pulses (voltage/current) from external drive control boards or gate drivers.

• Communication: No onboard communication; operates as a passive power component controlled via hardwired gate signals from PLCs, drive controllers, or phase‑angle regulators.

• Mounting Interface: Standard disk profile with pressure clamp compatibility for installation in rectifier stacks or drive power sections.

Core Functions

• High‑Power Rectification: Converts three‑phase AC to regulated DC for large DC motors, electrolysis systems, and industrial power supplies.

• Precise Phase‑Angle Control: Adjusts conduction angle via gate triggering to regulate output voltage/current, enabling accurate speed/torque control in heavy‑duty drives.

• Double‑Sided Heat Dissipation: Disk design allows bidirectional cooling between heat sinks, supporting high‑current operation with minimal thermal rise.

• High Surge Withstand: Handles large inrush and fault currents, protecting drive systems from overloads and short circuits.

• Legacy System Compatibility: Direct drop‑in replacement for older Reliance thyristor modules, ensuring seamless integration with existing automation infrastructure.

Application Scenarios

• Industrial DC Drives: Core power component in Reliance MaxPak III, FlexPak, and WebPak series for 50–750 HP DC motors.

• Heavy Machinery: Cranes, hoists, rolling mills, extruders, and conveyors requiring high starting torque and precise speed regulation.

• Power Conversion: Industrial rectifiers, battery chargers, and electrolysis processes in metalworking, chemical, and mining industries.

• Legacy Retrofits: Replacement part for aging Reliance drive systems in manufacturing, papermaking, textile, and material handling plants.

• High‑Current Phase Control: Industrial furnace heating, high‑power lighting control, and UPS systems requiring stable power regulation.

Usage and Maintenance Instructions

• Installation: Mount vertically between two clean, flat heat sinks with uniform pressure (torque clamps to 25–30 Nm); ensure parallel alignment to avoid mechanical stress.

• Wiring: Use high‑current copper busbars for anode/cathode connections; route shielded twisted‑pair wires for gate signals, separate from power wiring to minimize noise.

• Startup: Verify gate trigger voltage/current matches module ratings; perform insulation resistance test and check for anode‑cathode/gate short circuits before applying high power.

• Routine Maintenance (Quarterly): Clean heat sinks with dry compressed air to remove dust; inspect terminals for tightness, corrosion, or discoloration; verify gate signal integrity with an oscilloscope.

• Safety: Disconnect all power and wait minimum 5 minutes for DC bus capacitors to discharge before servicing; never operate without properly installed heat sinks and safety covers.