June 08, 2026

86475-11S Reliance Electric Three‑Phase SCR Rectifier Stack

The 86475-11S (also marked 8647511S) is a heavy‑duty three‑phase fully controlled SCR (thyristor) rectifier stack manufactured by Reliance Electric (now Rockwell Automation). It is a high‑power AC‑to‑DC conversion unit built for medium‑horsepower three‑phase DC drives, providing precise phase‑angle control for armature and field regulation in industrial environments. Introduced in the 1980s, the 86475-11S is obsolete and no longer in original production; available units are new surplus, refurbished, or tested used. The “11S” suffix stands for 11 A continuous current rating, left‑hand mounting configuration with integrated heat sink and gate drive hardware.

Description

86475-11S Reliance Electric Three‑Phase SCR Rectifier Stack

Product Overview

Model Nomenclature

86475: Reliance Electric three‑phase SCR rectifier stack family.
11: 11 A continuous DC current rating.
S: Left‑hand mounting orientation.

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, MOVs, and thermal cutoff.

Mechanical Construction and Features

Mounting: Left‑hand bracket mount (4‑bolt), designed for Reliance GTS, MaxPak, and S4 three‑phase drive enclosures.
Heat Sink: Vertical finned aluminum, integrated with heavy‑gauge steel base for optimal heat dissipation.
Gate Drive: Compact top‑mounted PCB with pulse transformers, resistors, and diodes for each SCR.
Terminals: Tin‑plated copper for low resistance and corrosion resistance.
Enclosure Rating: IP20.
Vibration: 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 up to +100°C.
Storage Temperature: ‑40°C to +85°C.
Humidity: 5%–95%, non‑condensing.
Altitude: Up to 1000 m without derating.

Compatibility and Applications

Compatible with Reliance GTS, MaxPak, and S4 series three‑phase DC drives.
Designed for left‑hand mounting positions in control panels and drive enclosures.
Typical uses: Conveyors, extruders, mixers, fans, pumps, and legacy three‑phase DC drive retrofits.

Lifecycle and Warranty

Original production discontinued; market supply includes new surplus, refurbished, and used units.
Refurbished units undergo full disassembly, cleaning, component replacement, and minimum 4‑hour load testing.
Warranty: 12 months (standard) against defects in materials and workmanship.
Exclusions: Unauthorized modification, improper installation, overvoltage/overcurrent, and mechanical damage。

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