Sincro FK/R4 Synchronous Alternators 4 poles/1-phase, Brushes/AVR

Sincro FK/R4 Series – 4-Pole Single-Phase Alternators

Brushes – AVR | 1500–1800 RPM | Self-Regulated | IP23

The Sincro FK/R4 Series alternators are engineered for low-speed, single-phase applications where voltage stability and reliability are essential. With brush-type excitation and integrated AVR (Automatic Voltage Regulator), these 4-pole synchronous alternators deliver precise voltage regulation for sensitive equipment and continuous-duty operation.

Key Features

• 4 Poles: Operates at 1500 rpm (50Hz) or 1800 rpm (60Hz)

• AVR-Controlled: ±2% voltage regulation for stable power output

• Brush-Type Excitation: Robust and consistent performance

• Self-Regulated Output: Ideal for variable loads

• IP23 Protection: For ventilated and semi-protected environments

• Coupling Options: IM B34, IM B35, SAE (flexible integration with gensets)

Applications

• Stationary and mobile generator sets

• Agricultural and workshop equipment

• Commercial backup systems

• Voltage-sensitive loads requiring AVR stability

• Generator OEM platforms for professional use

Technical Overview

Model: FK 4 MBA

• Power @ 50Hz: 5.5 kVA — Efficiency: 77%

• Power @ 60Hz: 6.8 kVA — Efficiency: 78%

• Weight: 36.3 kg

Model: FK 4 MCA

• Power @ 50Hz: 6.5 kVA — Efficiency: 79%

• Power @ 60Hz: 8.1 kVA — Efficiency: 80%

• Weight: 46.3 kg

Model: FK 4 MDA

• Power @ 50Hz: 8.0 kVA — Efficiency: 81%

• Power @ 60Hz: 10.0 kVA — Efficiency: 82%

• Weight: 56.3 kg

Standard Voltage: 230 V – 50 Hz
Voltage Regulation: Integrated AVR
Protection Class: IP23
Couplings: IM B34, IM B35, SAE