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86475-S Reliance Electric Three-Phase SCR Rectifier Stack

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86475-S Reliance Electric Three-Phase SCR Rectifier Stack
June 08, 2026

86475-S 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 Introduced in the 1980s, the 86475‑R is obsolete and no longer in original production; available units are new surplus, professionally refurbished, or tested used.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

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 Introduced in the 1980s, the 86475‑R is obsolete and no longer in original production; available units are new surplus, professionally refurbished, or tested used.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.

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.

要不要我把 86475-R、86475-11S 和 86475-11R 这三份说明统一成完全一致的结构和语气，方便你批量归档？
86475-S

86475-S Reliance Electric Three-Phase SCR Rectifier Stack

Product Overview

The 86475-S is a robust three-phase fully controlled SCR rectifier stack manufactured by Reliance Electric, now affiliated with Rockwell Automation. It serves as a key AC-to-DC power conversion component for medium horsepower three-phase DC drive systems. Utilizing phase-angle control technology, this unit converts three-phase alternating current into adjustable direct current, which is widely applied for armature and field regulation of industrial DC motors. First released in the 1980s, this model has been discontinued by the original manufacturer. Currently available products on the market include new surplus stock, professionally refurbished units and inspected second-hand devices. The suffix S stands for left-hand mounting orientation with standard industrial configuration, equipped with integrated heat dissipation structures and complete gate drive circuits to fit a wide range of legacy industrial drive equipment.

Model Nomenclature

The model number follows Reliance Electric’s standard naming specification for rectifier products. The code 86475 represents the entire series of three-phase SCR rectifier stacks. The suffix S indicates left-hand mounting structure and standard industrial grade design for general industrial application scenarios.

Key Electrical Specifications

This rectifier stack supports three-phase AC input of 230 VAC, 460 VAC or 575 VAC, and operates stably at both 50 Hz and 60 Hz power frequencies. Its DC output voltage ranges from 0 to 600 VDC, with 11 amperes continuous current and 30 amperes peak current. The internal circuit adopts three-phase fully controlled bridge topology, composed of six SCR modules and three freewheeling diodes. The power conversion efficiency remains above 97% under full load operating conditions. When tested at 1000 VDC, the insulation resistance is no less than 500 megohms. The unit can withstand a maximum di/dt of 100 A/μs and a maximum dv/dt of 500 V/μs. Integrated protective components include RC snubber circuits, metal oxide varistors and thermal cutoff switches, which effectively protect the equipment from damages caused by overvoltage, overcurrent and overheating.

Mechanical Construction and Features

The 86475-S is fitted with a left-hand mounting bracket with four mounting holes, enabling firm installation inside drive enclosures and control cabinets. It adopts vertical finned aluminum heat sinks mounted on a heavy-gauge steel base, delivering outstanding heat dissipation performance during long-term high-load operation. A dedicated gate drive printed circuit board is installed on the top of the main unit, integrated with pulse transformers, resistors and diodes to ensure stable triggering of each SCR module. All external connection terminals are made of tin-plated copper, featuring low contact resistance and excellent corrosion resistance. The overall structure is rated IP20, which prevents dust accumulation and avoids accidental contact with internal live parts. The product can resist vibration ranging from 10 Hz to 1000 Hz with acceleration up to 5 g. The approximate overall dimensions are 254 mm by 152 mm by 102 mm, and the weight is about 1.8 kg to 2.0 kg. Its unified installation footprint allows direct drop-in replacement of matching legacy rectifier stacks.

Environmental Specifications

The rated operating temperature ranges from -20 degrees Celsius to +85 degrees Celsius, and short-time operation up to +100 degrees Celsius is acceptable. The storage temperature covers the range from -40 degrees Celsius to +85 degrees Celsius. It can work normally in environments with relative humidity between 5% and 95% under non-condensing conditions. The unit can be installed and operated at an altitude up to 1000 meters without performance derating. For applications at altitudes higher than 1000 meters, performance derating is required to ensure safe and stable operation.

Compatibility and Applications

This product is fully compatible with Reliance GTS, MaxPak and S4 series three-phase DC drives. Designed for left-hand installation positions, it acts as an ideal replacement part for maintenance and retrofitting of old-style drive systems. It is extensively used on industrial equipment such as conveyors, plastic extruders, material mixers, industrial fans and water pumps. It is well suited for general industrial working conditions that require stable three-phase AC to DC conversion and reliable DC motor speed regulation.

Lifecycle and Warranty

Original production of the 86475-S has been fully terminated. Market supplies mainly consist of new surplus products, refurbished units and inspected used units. Refurbished products undergo complete disassembly, thorough cleaning, replacement of aging and degraded components, as well as a minimum 4-hour full load test to guarantee all technical parameters meet original factory standards. The standard warranty period is 12 months, covering quality defects of raw materials and workmanship under normal operating conditions. The warranty does not cover damages resulting from unauthorized disassembly and modification, incorrect installation, overvoltage, overcurrent, mechanical impact or operation beyond the rated environmental parameters.


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