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The STAMFORD range of synchronous AC generators includes 2-pole, 4-pole, and 6-pole generators at low voltage and 4-pole generators at medium and high voltages.

Stamford Generator ratings book
Stamford generator fault finding book


P0 / P1 Range

The new range of small generators by STAMFORD, the P0 and P1, cover 7.5 to 42.5kVA at 50Hz and 9.4 to 55kVA at 60Hz in 12 core lengths. The base machine is self-excited and designed to replace the self-excited BC range of generators.
- 2 pole or 4 pole configuration
- 7.5 - 53 kVa
- Improved Rating Alignment - there are 12 P0/P1 ratings compared with 10 for BC and UC224C, increasing the probability of engine node matches
- Enhanced Performance - improved motor starting and short circuit maintenance with the optional Excitation Boost System (EBS)
- The EBS has been designed to provide 300% short circuit current and improved motor starting. Supplied as a single module, EBS can be supplied at the factory, or added later
- Reduce your Operational Cost - with reduced gen-set assembly time compared with BC models
- Easier Service and Maintenance - EBS fitted and exchangeable without disturbing the core, AVR is plug and play, diodes are accessible without removing the rotor.

Industrial data sheets
PI042D 2 pole industrial 14.6 kVA data sheet - single phase
data sheet - 3 phase
PI042E 2 pole industrial 17.6 kVa data sheet - single phase
data sheet - 3 phase
PI042F 2 pole industrial 20.1 kVa data sheet - single phase
data sheet - 3 phase
PI042G 2 pole industrial 23.3 kVa data sheet - single phase
data sheet - 3 phase
PI142D 2 pole industrial 26.5 kVa data sheet - single phase
data sheet - 3 phase
PI142E 2 pole industrial 32.9 kVa data sheet - single phase
data sheet - 3 phase
PI142F 2 pole industrial 37.1 kVa data sheet - single phase
data sheet - 3 phase
PI142G 2 pole industrial 42.4 kVa data sheet - single phase
data sheet - 3 phase
PI142H 2 pole industrial 49.8 kVa data sheet - single phase
data sheet - 3 phase
PI142J 2 pole industrial 53.0 kVa data sheet - single phase
data sheet - 3 phase
PI044D 4 pole industrial 8.8 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI044E 4 pole industrial 11.8 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI044F 4 pole industrial 14.7 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI044G 4 pole industrial 17.6 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI044H 4 pole industrial 20.6 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144D 4 pole industrial 23.5 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144E 4 pole industrial 29.4 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144F 4 pole industrial 32.3 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144G 4 pole industrial 35.3 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144H 4 pole industrial 41.1 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144J 4 pole industrial 47.0 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PI144K 4 pole industrial 52.5 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
Marine data sheets
PM044D 4 pole marine 7.0 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM044E 4 pole marine 9.4 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM044F 4 pole marine 11.8 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM044G 4 pole marine 14.1 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM044H 4 pole marine 16.5 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144D 4 pole marine 18.8 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144E 4 pole marine 23.5 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144F 4 pole marine 25.8 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144G 4 pole marine 28.2 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144H 4 pole marine 32.9 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144J 4 pole marine 37.6 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only
PM144K 4 pole marine 42.0 kVa data sheet - single phase
data sheet - 3 phase reconnectable
data sheet - 3 phase 600 V only

Stamford UCI generatorUC Range
The UC 22/27 range of AC generators is available from 40 - 343 kVA.
- 2/3 Pitch windings avoid excessive neutral currents
- Class ‘H’ insulation with severe environmental protection standard
- Single and two bearing construction with dynamic rotor and sealed for life bearings
- Easy access for installation and maintenance
- 12 wire stator/terminal arrangement
- Built to conform with all leading industrial standards
- SX460 AVR standard with 1.0% regulation and 2 phase sensing
- IP 23 standard.

Spec sheets
UC 224 120 - 690 V, 42.5 - 103.8 kVA details
UC 274 120 - 690 V, 100 - 255 kVA details
UCD 224 120 - 690 V, 42.5 - 103.8 kVA details
UCD 274 120 - 690 V, 230 - 343 kVA details
UCM224 - marine 220 - 480 V, 35 - 92 kVA details
UCM274 - marine 220 - 480 V, 75 - 225 kVA details
Please contact our equipment sales dept. for technical or dimensional data

Stamford HC GeneratorHC Range
The HC 4/7 range of AC generators is available from 250 - 1500 kVA.

HCI Industrial AC generators
- 2/3 winding pitch to avoid excessive neutral currents
- Single or two bearing construction
- Easy access for installation and maintenance
- Built to conform to all leading industrial standards

HCM Marine AC generators
- 2/3 Pitch windings avoid excessive neutral currents
- Class ‘H’ insulation with severe environmental protection standard
- Single and two bearing construction with dynamic rotor and sealed for life bearings
- Easy access for installation and maintenance
- 12 wire stator/terminal arrangement
- Built to conform with all leading marine standards
- MX 341 AVR standard with 1.5% regulation and 2 phase sensing

Spec sheets
HC 4 120 - 690 V, 250 - 475 kVA details
HC 5 120 - 690 V, 450 - 825 kVA details
HCK 5 120 - 690 V, 450 - 843 kVA details
HC 6 120 - 690 V, 800 - 1438 kVA details
HCM4 - marine 220 - 480 V, 175 - 425 kVA details
HCM5 - marine 220 - 480 V, 320 - 725 kVA details
HCM6 - marine 240 - 480 V, 220 - 1275 kVA details
Please contact our equipment sales dept. for technical or dimensional data

Stamford P7 GeneratorsP7 Range
The P7 range of AC generators is available from 1225 - 2750 kVA.

PI7 Industrial AC generators
- 4 pole (1500rpm) 50Hz AC Generators
- 4 pole (1800rpm) 60Hz AC Generators
- 2/3 winding pitch to avoid excessive neutral currents
- Single or two bearing construction
- Easy access for installation and maintenance
- Built to conform to all leading industrial standards

PM7 Marine AC generators
- 2/3 Pitch windings avoid excessive neutral currents
- Class ‘H’ insulation with severe environmental protection standard
- Single and two bearing construction with dynamic rotor and sealed for life bearings
- Easy access for installation and maintenance
- 6 wire stator/terminal arrangement
- Built to conform with all leading marine standards
- MX 321 AVR standard with 0.5% regulation 3 phase rms AVR sensing

Spec sheets
P7 380 - 690 V, 1260 - 2750 kVA details
P7M - marine 380 - 690 V, 910 - 2480 kVA details
Please contact our equipment sales dept. for technical or dimensional data

Transformer controlled generators
The STAMFORD range of "series 5" transformers controlled a.c. generators range from 6.25 kVA to 88 kVA. This robust range of generators feature superb motor starting capabilities (1 HP per kW). The voltage regulations for the series 5 generator is + 5 % at 0.8PF.

BCI 16/18 transformer controlled AC generators
- A range of 4-pole, single or 2-bearing transformer controlled generators designed for very high motor starting loads (450 % for up to 7 seconds) where fine voltage regulation is less critical
- Engine adaptors to SAE 1, 2, 3, 4, 5 & 6, and coupling discs to SAE 6-1/2, 7-1/2, 8, 10 & 11-1/2
- Windings are specific to output voltage (single or three phase)
- Voltages available range up to 480 V.
- IP23 enclosure protection standard

UCI22 / UCDI22 transformer controlled AC generators
- A range of 4-pole, single or 2-bearing transformer controlled generators designed for very high motor starting loads (450 % for up to 7 seconds) where fine voltage regulation is less critical
- Engine adaptors to SAE 1, 2, 3, 4 & 5, and coupling discs to SAE 7-1/2, 8, 10, 11-1/2, & 14 available on UCI generators
- UCDI 22 is dedicated to SAE 3/10 & SAE 3/11-1/2 adaptor/disc options
- Windings are specific to output voltage (single or three phase)
- Voltages available range up to 480 V.
- IP22 enclosure protection is standard, IP23 is optional at reduced ratings

Please contact our equipment sales dept. for technical or dimensional data.


Automatic Voltage Regulators
A range of Automatic Voltage Regulators designed to achieve optimum performance from STAMFORD AC generators.

A key feature of all STAMFORD AVR’s is the engine relief load acceptance feature. This is called the Under Frequency Roll Off (UFRO) circuit. It reduces the output voltage when the engine fails to maintain frequency during motor starting. This reduction in power requirement with engine speed assists the Prime Mover to recover speed after application of a heavy load and protects the rotor against over-excitation.

  BC16 BC18 UC22 UC27 HC4 HC5 HC6 P7
SX460 std std std std n/a n/a n/a n/a
SX440 n/a n/a optional optional std std n/a n/a
SA465 optional optional n/a n/a n/a n/a n/a n/a
SX421 n/a optional optional optional optional optional n/a std
MX341 n/a n/a optional optional optional optional n/a std
MX321 n/a n/a optional optional optional optional std optional
Stamford AVR's

Spec sheets
SX460 The standard AVR for generators in the lower power bands (less than 200 kVA). This is a low cost AVR for low-tech applications where paralleling is not a requirement. The voltage regulation is in the order of ± 1.5%*. The UFRO feature operates at a preset point 95% of the operating frequency. details
SX440 The SX440 AVR is fitted to a generator in the range of 250 – 800 kVA as standard and as an option on generators of 22 –250 kVA . The voltage regulation is in the order of ± 1%*. The UFRO feature operates at a pre-set point 95% of the operating frequency. A range of accessories is available for this AVR including the requisites for parallel operation. details
SX465 This is a smaller AVR similar in performance to the SX440. The reduced size makes it ideal for mounting inside the smaller terminal box of the BC range of generators. Regulation of ± 1%* , UFRO circuit preset at 95% of operating speed. This AVR is either powered from the output terminals or from an auxiliary winding as fitted to the BC184. Ideal for marine applications and is an economical way to improve motor starting. details
SX421 This AVR is offered as an alternative to the SX440. It has the advantage of better regulation, ± 0.5%*, UFRO at 95%.of the operating frequency and 3 phase 3 wire sensing ideal for supplying unbalanced loads. Newage electrical accessories are available with this AVR. details
MX341 The MX341 achieves a voltage regulation of ± 1%*. The UFRO feature operates at a pre-set point 95% of the operating frequency. Short circuit current is maintained for 10 seconds, to allow breaker discrimination to operate, before the AVR shuts down to protect the generator from damage. Accepts all of the Newage range of electronic accessories. details
MX321 MX321 The MX321 is the top of the range high specification AVR, it is supplied as standard on Frame 6 & 7 generators (800-2000 kVA) and is available as an option on generators in the range of 250-800 kVA. It features ± 0.5%* (RMS) regulation, fully adjustable UFRO, short circuit maintenance for 8-15 seconds. Current limiting may be included to allow control over the amount of short circuit current flowing during short circuits. Accepts all of the Newage range of electronic accessories. details

Electronic accessories

Accessory MX321 MX341 SX421 SX440 SA465 SX460
Excitation circuit breaker, for isolation of the excitation system available n/a incl n/a n/a n/a
RFI suppressor kit available available available available available available
Separate voltage trimmer, for remote mounting available available available available available available
Quadrature droop kit* available available available available available n/a
Power factor controller , PFC3 available available available available available n/a
Remote control interface , for use with PFC3 available available available available available n/a
Excitation loss module , select 12V or 24V available available available available available n/a
Diode failure detector , select 380V or 220V available available available available available n/a
Frequency detection module , select 12V or 24V available available n/a n/a n/a n/a
Dual AVR (manual change over); hard wired spare AVR available available n/a n/a n/a n/a
Manual voltage regulator available available n/a n/a n/a n/a
Line drop compensation, counters line drop on long transmission lines available available available available available n/a
Alternator protection module available available available available available available

* When two or more ac generators are connected in parallel it is necessary to share the mechanical and the electrical loads evenly. The mechanical load sharing is controlled by the engine governors. The electrical load is controlled with the aid of a current transformer that works in conjunction with the AVR (not available on a SX 460 AVR). When the generator is paralleled to the mains; the power factor of the load can also be controlled, with the aid of a Power Factor Controller.

page updated September 2013