86495-1R Reliance Electric Single-Phase SCR Rectifier Stack

Product Overview

Model Nomenclature

• 86495: Base series code for Reliance single-phase rectifier stacks (distinguished from the three-phase 86475 series).

• 1: Indicates a single-phase electrical topology with one SCR bridge arm assembly.

• R: Specifies right-hand mounting configuration and standard industrial-grade control interface layout.

Electrical Specifications

• Input Voltage: 230 VAC or 460 VAC, single-phase, 50/60 Hz.

• Output Voltage: 0–300 VDC, infinitely adjustable via drive control signals.

• Continuous Current Rating: 11 ADC; peak surge current up to 30 ADC for short-duration overloads.

• Power Topology: Single-phase full-controlled bridge, incorporating 2 SCRs (silicon-controlled rectifiers) and 2 freewheeling diodes for bidirectional power flow and regenerative braking capability.

• Control Interface: Accepts 0–10 VDC analog speed reference signals and dry-contact start/stop and forward/reverse commands from operator stations (e.g., 86485-6S).

• Protection Features: Integrated RC snubber circuits for voltage spike suppression, MOV (metal oxide varistor) overvoltage protection, and a thermal switch for overtemperature shutdown to safeguard SCRs and associated drive components.

• Insulation Rating: 1500 VAC dielectric strength between input/output circuits and chassis, ensuring electrical isolation and safety in industrial environments.

Mechanical & Construction Features

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

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

• Terminals: Rear-positioned screw terminals for AC line input, DC output, control signals, and interlock connections; clearly labeled for easy wiring and maintenance.

• Dimensions (Approximate): 178 mm (7.0 in) × 89 mm (3.5 in) × 51 mm (2.0 in).

• Weight (Approximate): 0.9 kg (2.0 lbs), compact and lightweight for flexible installation.

• Environmental Ratings: Operating temperature range –20°C to +60°C; 5–95% relative humidity (non-condensing); vibration resistance up to 5 g (10–1000 Hz) for reliable operation in harsh industrial settings.

Compatibility & Applications

• Drive Compatibility: Direct drop-in replacement or original component for Reliance MinPak Plus, MaxPak, S4, and other legacy single-phase DC drive systems; compatible with matching operator stations (86475 series, 86485 series) and control accessories.

• Industrial Applications: Ideal for small-to-medium horsepower DC motor applications requiring precise speed control and reversing capability, including conveyors, extruders, mixers, fans, pumps, and winding/unwinding machines.

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

Lifecycle & Warranty

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

• Available Conditions: New surplus (unused, original factory packaging), refurbished (cleaned, inspected, SCRs tested, thermal calibration performed), and tested used (fully functional with verified 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 4-hour load burn-in test to validate electrical performance, thermal stability, and protection circuit functionality before shipment.

Key Advantages

• Proven Reliability: Field-tested in industrial applications for decades, with a robust design built to withstand harsh operating conditions.

• Simplified Integration: Standardized mounting, wiring terminals, and control interface enable seamless integration with existing Reliance DC drive systems and operator stations.

• Cost-Effective Support: Availability of refurbished and surplus units provides a cost-effective alternative to full drive system replacement for legacy equipment maintenance.