June 08, 2026

86475-R Reliance Electric Three-Phase SCR Rectifier Stack

The 86475-R is a heavy-duty three-phase fully controlled SCR (thyristor) rectifier stack originally designed and manufactured by Reliance Electric (now part of Rockwell Automation). It serves as a core AC-to-DC power conversion component for medium‑horsepower three‑phase DC drive systems, delivering precise phase‑angle control for armature and field excitation regulation in industrial environments. Introduced in the 1980s, the 86475‑R is obsolete and no longer in original production; available units are new surplus, professionally refurbished, or tested used. The “R” suffix denotes right‑hand mounting orientation with integrated heat sink and gate drive hardware, matching the mechanical footprint of other 86475 series stacks for direct replacement.

Description

86475-R Reliance Electric Three-Phase SCR Rectifier Stack

Product Overview

Model Nomenclature

86475: Reliance Electric three‑phase SCR rectifier stack family code.
R: Right‑hand mounting configuration, standard current rating for the series.

Key Electrical Specifications

Input: 230 VAC, 460 VAC, or 575 VAC, 50/60 Hz, three‑phase.
Output: 0–600 VDC, 11 A continuous, 30 A peak.
Topology: Three‑phase full‑controlled bridge (6 SCRs + 3 freewheeling diodes).
Efficiency: ≥97% at full load.
Insulation Resistance: ≥500 MΩ @ 1000 VDC.
dv/dt: up to 500 V/μs; di/dt: up to 100 A/μs.
Protection: Integrated RC snubbers, metal oxide varistors (MOVs), and thermal cutoff switches to guard against overvoltage, overcurrent, and overheating.

Mechanical Construction and Features

Mounting: Right‑hand bracket mount (4‑bolt), engineered for Reliance GTS, MaxPak, and S4 three‑phase drive enclosures.
Heat Sink: Vertical finned aluminum construction mounted on a heavy‑gauge steel base, ensuring efficient heat dissipation during prolonged high‑load operation.
Gate Drive: Compact top‑mounted PCB assembly with pulse transformers, resistors, and diodes for independent and reliable triggering of each SCR.
Terminals: Tin‑plated copper for low contact resistance and enhanced corrosion resistance.
Enclosure Rating: IP20, protecting against dust and accidental contact with live internal components.
Vibration Resistance: 10 Hz–1000 Hz, up to 5 g.
Dimensions (approx.): 254 mm × 152 mm × 102 mm (10.0 in × 6.0 in × 4.0 in).
Weight (approx.): 1.8–2.0 kg (4.0–4.4 lbs).

Environmental Specifications

Operating Temperature: ‑20°C to +85°C; short‑term operation up to +100°C permitted.
Storage Temperature: ‑40°C to +85°C.
Humidity: 5%–95% relative humidity, non‑condensing.
Altitude: Up to 1000 m without performance derating; derating required for higher elevations.

Compatibility and Applications

Fully compatible with Reliance GTS, MaxPak, and S4 series three‑phase DC drives.
Designed for right‑hand mounting positions in control panels and drive enclosures, enabling drop‑in replacement for legacy systems.
Typical applications include conveyors, plastic extruders, mixers, fans, pumps, and general‑purpose industrial machinery requiring stable three‑phase AC‑to‑DC conversion and precise DC motor speed regulation.

Lifecycle and Warranty

Original manufacturing discontinued; market supply consists of new surplus, refurbished, and tested used units.
Refurbished units undergo complete disassembly, thorough cleaning, replacement of worn or aging components, and a minimum 4‑hour full‑load burn‑in test to verify performance.
Standard Warranty: 12 months against defects in materials and workmanship under normal operating conditions.
Warranty Exclusions: Unauthorized modification, improper installation, overvoltage/overcurrent events, mechanical damage, or operation outside rated environmental parameters.

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