June 08, 2026

86474-S Reliance Electric Single‑Phase SCR Rectifier Stack (Left‑Hand Mount)

The 86474‑S is a heavy‑duty, left‑hand mounted single‑phase fully controlled SCR (thyristor) rectifier stack manufactured by Reliance Electric (now Rockwell Automation). It is a specialized variant of the 86474 series, designed as a direct replacement or drop‑in power conversion unit for older Reliance DC drives. Like other models in the family, it converts single‑phase AC to adjustable DC using phase‑angle control, but features a left‑hand mounting configuration to match specific enclosure layouts and mechanical constraints in legacy systems. Introduced in the 1980s, the 86474‑S is obsolete and no longer in original production; available units are new surplus, refurbished, or tested used. The “S” suffix denotes standard industrial grade with integrated heat sink and gate drive hardware.

Description

86474-S Reliance Electric Single‑Phase SCR Rectifier Stack (Left‑Hand Mount)

Product Overview

Model Nomenclature

86474: Reliance Electric part family for single‑phase SCR rectifier stacks.
‑S: Standard grade with left‑hand mounting orientation.

Key Electrical Specifications

Input: 230 VAC or 460 VAC, 50/60 Hz, single‑phase.
Output: 0–600 VDC, 25–30 A continuous.
Topology: Single‑phase full‑controlled bridge (2 SCRs + 2 freewheeling diodes).
Efficiency: ≥96% at full load.
Insulation Resistance: ≥500 MΩ @ 1000 VDC.
dv/dt: up to 400 V/μs; di/dt: up to 80 A/μs.
Protection: Integrated RC snubbers, MOVs, and thermal cutoff.

Mechanical Construction and Features

Mounting: Left‑hand bracket mount (2‑bolt), engineered for compatibility with specific GTS/MaxPak/S4 enclosures.
Heat Sink: Vertical finned aluminum, integrated with heavy‑gauge steel base.
Gate Drive: Compact top‑mounted PCB with pulse transformer, resistors, and diodes.
Terminals: Tin‑plated copper for low resistance and corrosion resistance.
Enclosure Rating: IP20.
Vibration: 10 Hz–1000 Hz, up to 5 g.
Dimensions (approx.): 203 mm × 102 mm × 76 mm (8.0 in × 4.0 in × 3.0 in).
Weight (approx.): 0.91–1.0 kg (2.0 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 single‑phase DC drives.
Designed for left‑hand mounting positions in control panels and drive enclosures.
Typical uses: Small conveyors, material handling, light‑duty DC motors, and legacy drive retrofits.

Lifecycle and Warranty

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

Contact Info