86466-88T Reliance Electric Three-Phase SCR Rectifier Stack

Product Overview

Model Nomenclature

• 86466: Base series code for Reliance three-phase high-power rectifier stacks (distinguished from single-phase 86495 series and lower-power 86475 series).

• 88: Specifies 460VAC input voltage and 80ADC continuous current rating.

• T: Indicates three-phase electrical topology with integrated thermal protection and standard industrial mounting configuration.

Electrical Specifications

• Input Voltage: 460 VAC, three-phase, 50/60 Hz (compatible with 400–480 VAC industrial grids).

• Output Voltage: 0–600 VDC, infinitely adjustable via drive control signals for precise DC motor speed regulation.

• Continuous Current Rating: 80 ADC; peak surge current up to 200 ADC for short-duration overloads (10-second maximum).

• Power Topology: Three-phase full-controlled bridge, incorporating 6 SCRs (silicon-controlled rectifiers) and 6 freewheeling diodes for bidirectional power flow and regenerative braking capability.

• Control Interface: Accepts 0–10 VDC analog speed reference signals, 4–20 mA current signals, and dry-contact start/stop, forward/reverse, and interlock commands from operator stations or PLC systems.

• Protection Features: Integrated RC snubber circuits for voltage spike suppression, MOV (metal oxide varistor) overvoltage protection, thermistor-based overtemperature shutdown, and overcurrent sensing via current transformers (CTs).

• Insulation Rating: 2000 VAC dielectric strength between input/output circuits and chassis, ensuring robust electrical isolation in high-voltage industrial environments.

• Efficiency: Full-load efficiency ≥98%, minimizing power loss and heat generation during continuous operation.

Mechanical & Construction Features

• Heat Sink Assembly: Heavy-duty extruded aluminum alloy heat sinks with vertical fin design for efficient passive cooling; SCRs and diodes are bolt-mounted between paired heat sink stacks with thermal grease to maximize heat dissipation.

• Enclosure & Mounting: Rugged steel chassis with industrial-grade epoxy painted finish, rated IP20 for protection against finger contact and solid debris. Panel-mountable with 6 standard mounting holes for secure installation in drive cabinets or control panels.

• Terminals: Front-positioned heavy-duty screw terminals for three-phase AC line input, DC output, control signals, and interlock connections; clearly labeled with engraved identifiers for easy wiring and maintenance.

• Dimensions (Approximate): 356 mm (14.0 in) × 203 mm (8.0 in) × 102 mm (4.0 in).

• Weight (Approximate): 5.4 kg (12.0 lbs), robust yet compact for flexible installation in industrial control panels.

• Environmental Ratings: Operating temperature range –20°C to +65°C; 5–95% relative humidity (non-condensing); vibration resistance up to 5 g (10–1000 Hz) for reliable operation in harsh industrial settings such as mills, mines, and manufacturing plants.

Compatibility & Applications

• Drive Compatibility: Direct drop-in replacement or original core component for Reliance MaxPak Plus, AutoMax, and other legacy three-phase DC drive systems; compatible with matching operator stations (86475 series, 86485 series) and control accessories.

• Industrial Applications: Ideal for high-horsepower DC motor applications requiring precise speed control, high torque, and regenerative braking, including rolling mills, extruders, large conveyors, winders, paper machines, and mining equipment.

• Retrofit & Replacement: A critical spare part for aging Reliance DC drive systems, enabling cost-effective retrofits and minimizing downtime in industrial facilities with legacy high-power equipment.

Lifecycle & Warranty

• Production Status: Original manufacturing discontinued in the late 1990s; no new units produced by Reliance Electric.

• Available Conditions: New surplus (unused, original factory packaging with full documentation), refurbished (cleaned, inspected, SCRs and diodes tested, thermal calibration performed, and protective components replaced as needed), and tested used (fully functional with verified electrical and thermal performance).

• Warranty: Refurbished units typically include a 12-month limited warranty; new surplus units may carry extended warranty coverage from authorized suppliers.

• Testing Requirements: All refurbished and used units undergo a minimum 5-hour full-load burn-in test to validate electrical performance, thermal stability, and protection circuit functionality before shipment.

Key Advantages

• Proven Industrial Reliability: Field-tested in high-power industrial applications for decades, with a robust design built to withstand harsh operating conditions, voltage fluctuations, and heavy overloads.

• High Power Density: Compact footprint with high current and voltage ratings, saving valuable cabinet space in industrial control panels.

• Simplified System Integration: Standardized mounting, heavy-duty wiring terminals, and universal control interface enable seamless integration with existing Reliance DC drive systems and third-party PLC/operator stations.

• Cost-Effective Legacy Support: Availability of refurbished and surplus units provides a cost-effective alternative to full drive system replacement, extending the service life of aging industrial equipment.