4-pole alternators
for for portable and mobile gen-sets
4-Pole Alternators
For Portable And Mobile Gen-Sets
The Sincro 4-pole alternators deliver reliable low-voltage AC power at 1500 rpm (50 Hz) or 1800 rpm (60 Hz), making them ideal for portable and mobile generator sets. Single-phase models (FK4, GK4, GKR4): Available in brushless capacitor-excited or brush/AVR-regulatedversions, with outputs from 5.5 to 21 kVA, ensuring stable and efficient single-phase supply. Three-phase models (FT4, GT4, GTR4): Brush/compound and digital AVR versions offering 7 to 36 kVA, with high efficiency up to 90%, suited for heavy-duty and rental power applications.
All models feature IP23 protection, H-class insulation, and are built for durability, ensuring dependable performance in demanding environments.
1-phase:
Brushless/capacitor models:
Brushes/AVR models models:
3-phase:
Brushes/compound models:
Brushes/AVR models:
FK4 Series
1-Phase/4-Pole Synchronous Low Voltage AC Alternators
The FK4 series from Sincro offers compact, reliable 4-pole single-phase synchronous alternators designed for continuous duty at 1500 rpm (50 Hz) or 1800 rpm (60 Hz). FK4 (Brushless – Capacitor): Self-regulated alternators using capacitor excitation, ideal for simple, maintenance-free operation with stable performance. FK4/R (Brushes – AVR): Alternators with brushes and integrated AVR for precise voltage regulation, ensuring consistent output even under variable load conditions.
Both variants feature IP23 protection, standard 230 V / 50 Hz voltage, and versatile couplings (IM B34, IM B35, SAE), making them suitable for agricultural, construction, and general backup power applications
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Self-regulated
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IP 23
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Standard voltage: 230 V - 50 Hz
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Short circuit current greater than 3 In (only BRUSHLESS - CAPACITOR models)
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Couplings: IM B34, IM B35, SAE
*Power (kVA) - S1 40°C • H class (kVA 230/240V 50/60Hz) – Continuous power output (S1 duty) at 230/240V, 50/60Hz, 40°C ambient, H class insulation; η 4/4 p.f. 1 (%) –Efficiency at full load and power factor 1
IM B34 - B3/B14
*IM = International Mounting (IEC 60034-7 code system); B3 = Foot-mounted (horizontal feet on the base, no flange); B14 = Small flange-mounted (spigot/flange with threaded holes for face mounting); B34 = Combination of B3 and B14 — the unit has both feet and a small flange, so it can be mounted in either way.
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
SAE5, SAE4, SAE3
*SAE flange mounting sizes
FK4 steel series
Synchronous Alternators, Brushless - Capacitor
The FK4 Steel series are robust single-phase, 4-pole synchronous alternators with brushless capacitor excitation. Built with a reinforced steel frame, they combine durability with self-regulated performance for reliable power generation.
Operating at 1500 rpm (50 Hz) or 1800 rpm (60 Hz), they provide stable 230 V output with IP23 protection and short-circuit current >3In. Standard couplings include IM B34, IM B35, and SAE, making them suitable for heavy-duty industrial, agricultural, and standby applications where strength and long service life are essential
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Self-regulated
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IP 23
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Standard voltage: 230 V - 50 Hz
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Short circuit current greater than 3 In
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Couplings: IM B34, IM B35, SAE
*Power (kVA) - S1 40°C • H class (kVA 230/240V 50/60Hz) – Continuous power output (S1 duty) at 230/240V, 50/60Hz, 40°C ambient, H class insulation; η 4/4 p.f. 1 (%) –Efficiency at full load and power factor 1
IM B34 - B3/B14
*IM = International Mounting (IEC 60034-7 code system); B3 = Foot-mounted (horizontal feet on the base, no flange); B14 = Small flange-mounted (spigot/flange with threaded holes for face mounting); B34 = Combination of B3 and B14 — the unit has both feet and a small flange, so it can be mounted in either way.
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
SAE5, SAE4, SAE3
*SAE flange mounting sizes
GK4 / GKR4 Series–
1-Phase/4-Pole Synchronous Low Voltage AC Alternators
The GK4 and GKR4 series are high-performance single-phase 4-pole synchronous alternators, designed for durability and stable output. GK4 (Brushless – Capacitor): Self-regulated alternators with capacitor excitation, delivering reliable 230 V power with minimal maintenance. GKR4 (Brushes – AVR): Self-regulated alternators with brushes and Digital AVR, ensuring precise voltage control under varying loads.
Both series operate at 1500 rpm (50 Hz) or 1800 rpm (60 Hz), feature IP23 protection, and support versatile couplings (IM B34, IM B35, SAE). Built with a reinforced steel frame, they are ideal for industrial, agricultural, and standby power applications requiring long service life and dependable performance.
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Self-regulated
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IP23
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Standard voltage: 230 V - 50 Hz
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Couplings: IM B34, IM B35, SAE
*Power (kVA) - S1 40°C • H class (kVA 230/240V 50/60Hz) – Continuous power output (S1 duty) at 230/240V, 50/60Hz, 40°C ambient, H class insulation; η 4/4 p.f. 1 (%) –Efficiency at full load and power factor 1
IM B34 - B3/B14
*Foot-mounted + small flange mounting (IEC 60034-7)
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
SAE5, SAE4, SAE3
*SAE flange mounting sizes
GT4 / GTR4 –
3-Phase/4-Pole Alternators
The GT4 and GTR4 series are heavy-duty 4-pole three-phase synchronous alternators designed for reliable performance in portable, mobile, and stationary generator sets. Built with IP23 protection and H-class insulation, they deliver stable power at 1500 rpm (50 Hz) or 1800 rpm (60 Hz) with outputs from 22 to 36 kVA.
GT4 (Brushes – Compound): Rugged, self-regulated alternators providing dependable power for demanding applications. GTR4 (Brushes – AVR): Equipped with digital AVR for precise voltage regulation and superior stability under load variations.
Thanks to their robust construction, versatile couplings (IM B34, IM B35, SAE), and high efficiency (up to 90%), the GT4/GTR4 series are a trusted solution for industrial, rental, and continuous-duty power generation.
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Self-regulated
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IP23
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Standard voltage: 230 V - 50 Hz
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Couplings: IM B34, IM B35, SAE
*Power (kVA) - S1 40°C • H class (kVA 230/240V 50/60Hz) – Continuous power output (S1 duty) at 230/240V, 50/60Hz, 40°C ambient, H class insulation; η 4/4 p.f. 1 (%) –Efficiency at full load and power factor 1
IM B34 - B3/B14
*Foot-mounted + small flange mounting (IEC 60034-7)
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
FK/R-FT/R steel series
Portable Synchronous Alternators
The Sincro FK/R and FT/R Series are robust, self-regulated synchronous alternators available in both single-phase (230 V) and three-phase (230/400 V) configurations. Designed with brush excitation and Digital AVR, they ensure stable voltage output and excellent performance across 4-pole (1500/1800 rpm) models. With IP23 protection, multiple coupling options (IM B34, IM B35, SAE), and high short-circuit capacity (compound versions), these alternators are ideal for industrial, commercial, and mobile power generation applications.
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Self-regulated
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IP 23
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Standard voltage: 230/400 V - 50 Hz
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Short circuit current greater than 3 In (only compound)
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Couplings: IM B34, IM B35, SAE DIGITAL
*Power (kVA) - S1 40°C • H class (kVA 230/240V 50/60Hz) – Continuous power output (S1 duty) at 230/240V, 50/60Hz, 40°C ambient, H class insulation; η 4/4 p.f. 1 (%) –Efficiency at full load and power factor 1
IM B34 - B3/B14
*IM = International Mounting (IEC 60034-7 code system); B3 = Foot-mounted (horizontal feet on the base, no flange); B14 = Small flange-mounted (spigot/flange with threaded holes for face mounting); B34 = Combination of B3 and B14 — the unit has both feet and a small flange, so it can be mounted in either way.
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
SAE5, SAE4, SAE3
*SAE flange mounting sizes
FT4-series
3-Phase/4-Poles Portable Synchronous Alternators
The FT4 series are compact 4-pole three-phase synchronous alternators designed for generator sets requiring reliable power output at 1500 rpm (50 Hz) or 1800 rpm (60 Hz). FT4 (Brushes – Compound): Self-regulated alternators providing robust and stable performance with outputs from 7 to 13 kVA. FT4/R (Brushes – AVR): Equipped with an AVR regulator for precise voltage control under load variations, delivering the same power range with higher voltage stability.
All models feature IP23 protection, standard 230/400 V 50 Hz, and couplings IM B34, IM B35, SAE, making them ideal for portable, mobile, and stationary generator sets
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Self-regulated
-
IP 23
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Standard voltage: 230/400 V - 50 Hz
-
Short circuit current greater than 3 In (only compound)
-
Couplings: IM B34, IM B35, SAE DIGITAL
IM B34 - B3/B14
*IM = International Mounting (IEC 60034-7 code system); B3 = Foot-mounted (horizontal feet on the base, no flange); B14 = Small flange-mounted (spigot/flange with threaded holes for face mounting); B34 = Combination of B3 and B14 — the unit has both feet and a small flange, so it can be mounted in either way.
IM B35 - J609b (c25,4 / 35)
*Foot + flange mounting, SAE J609B tapered shaft, cone Ø 25.4 mm or Ø 35 mm.
IM B35 - B3/B9 (c30 / 38)
*Foot-mounted or B9 variant mounting, with tapered shaft cone Ø 30 mm or Ø 38 mm
SAE5, SAE4, SAE3
*SAE flange mounting sizes
