86466-69R Reliance Electric Three-Phase SCR Rectifier Stack
Product Overview
The 86466-69R is a heavy‑duty three‑phase full‑controlled SCR (thyristor) rectifier stack designed by Reliance Electric (now ABB Baldor‑Reliance) for industrial DC drive systems. It converts AC to regulated DC with precise phase‑angle control, serving as the core power stage for MaxPak Plus and S6 series DC drives, as well as other high‑power industrial platforms. Built for continuous operation in harsh environments—such as steel mills, mine hoists, paper machines, and cement plants—it delivers stable DC power for large DC motors under heavy load, high temperature, and vibration conditions. Each unit undergoes full‑load aging, thermal cycling, insulation, and vibration testing to ensure long‑term reliability.
Model Nomenclature
86466: Core series for Reliance high‑current rectifier stacks
69: Rated DC output current of 69A
R: Standard industrial version with robust base and heat sinks (no integrated RC snubber; optional in higher “RC” variants)
Key Electrical Specifications
Input: Three‑phase AC, 230VAC or 460VAC, 50/60Hz
Output: DC, 69A continuous, max 600VDC
Topology: Three‑phase full‑controlled bridge (6× press‑pack SCRs)
Efficiency: ≥98% at full load
Forward Drop (per SCR): ≤1.5V
Insulation Resistance: ≥500MΩ @ 1000VDC
di/dt: Up to 100A/μs; dv/dt: Up to 500V/μs
Surge Current: High, supports heavy startup and transient overloads
Protection: Metal oxide varistors (MOV), thermal cutoff switches; external RC snubbers may be added for noise suppression
Mechanical Construction and Features
The 86466-69R features a rugged, bolted industrial design. It uses a heavy‑gauge flat metal base with internal buffer capacitors and power resistors. Two vertical finned aluminum heat sink towers are mounted on either side of a central metal carrier, which holds press‑pack SCR modules on both sides for balanced heat dissipation. High‑temperature thermal paste minimizes thermal resistance between SCRs and heat sinks. Gate drive circuit boards are mounted at the top of the central carrier, with terminal blocks using tin‑plated copper for low‑resistance connections. The assembly is dust‑resistant (IP20) and built to withstand 10–1000Hz vibration up to 5g. Standard mounting footprint ensures direct compatibility with 86466‑60T, 86466‑63R, and 86466‑74RC for drop‑in replacement.
Environmental Specifications
Operating Temperature: -20°C to +85°C; short‑term up to +100°C
Storage Temperature: -40°C to +85°C
Relative Humidity: 5%–95% RH, non‑condensing
Vibration: 10Hz–1000Hz, up to 5g
Altitude: Up to 1000m (derate above 1000m)
Enclosure: IP20 (dust‑resistant, limited access to live parts)
Compatibility and Applications
The 86466-69R is fully compatible with Reliance MaxPak Plus (25–100HP) and S6 series DC drives. It is commonly used as a mid‑range upgrade from 60T/63R and a lower‑cost alternative to 74RC in 69A applications. Typical uses include steel rolling mills (speed/tension control), mine hoists (rugged reliability), paper machines (continuous operation), cement kilns (heavy‑load motors), and plastic extruders (stable DC power).
Lifecycle and Warranty
Original 86466-69R units are no longer in production. The market supplies refurbished, surplus, or tested used units. Refurbished units are fully disassembled, cleaned, rebuilt with new wear components, and tested for a minimum of 5 hours under load. 2026 pricing: refurbished $2,200–$3,400; surplus new $4,400–$5,500. Standard warranty is 6–12 months, covering defects in materials and workmanship under normal operation. Warranty excludes damage from unauthorized modification, improper installation, overvoltage/overcurrent, mechanical impact, or operation beyond rated environmental limits.
Get a Quote