Brand: STAMFORD

STAMFORD S0 Low Voltage Alternator 7.5-30 kVA

Name: STAMFORD S0 Low Voltage Alternator – Brochure & Quote
Brand: STAMFORD
SKU: STAMFORD S0

Description

A compact alternator for small diesel and gas gensets

The STAMFORD S0 is the smallest alternator in the STAMFORD S-Range and covers 7.5 to 30 kVA at 50 Hz (9 to 36 kVA at 60 Hz). It is a four-pole, wire-wound, brushless machine with a single bearing, built for the compact gen-sets that sit under telecom shelters, site offices, small pumping stations and rental fleets. The brochure lists standby power, telecommunications, construction, combined heat and power, critical protection and UPS, and continuous power as the intended duties, on diesel or gas engines.

Two frame lengths make up the range. S0L1 is the shorter core (7.5 to 15 kVA three-phase) and S0L2 the longer one (17.5 to 30 kVA). Voltage is regulated by the AS540 analogue AVR with two-phase sensing, and excitation is self-exciting as standard. The design target stated by STAMFORD is a minimum of 20,000 hours of service life, backed by 9,000 hours of highly accelerated life testing on the components.

Technical specifications

Parameter	Specification
Range	STAMFORD S0 (S0L1 and S0L2 cores)
Rating at 50 Hz	7.5-30 kVA
Rating at 60 Hz	9-36 kVA
Voltage range, 3-phase	400/415 V at 50 Hz; 480 V at 60 Hz
Poles	4
Technology	Wire wound
AVR	Analogue, AS540
Voltage sensing	2 phase
Bearing arrangement	Single
SAE adaptors	3, 4, 5
Terminals	12
Insulation class	H
Excitation system	Self-exciting; auxiliary winding optional (not for 7.5 to 15 kVA)
Ingress protection	IP23
Optional features	1-phase reconnection, anti-condensation heater, flexible foot mounting (S0L1 132-160 mm, S0L2 160-180 mm)
Current transformers	Optional; not offered on S0L1
Standards	UL certified, IEC and NEMA compliant (as printed)

Three-phase ratings at 400/415 V, 50 Hz, continuous 125/40

Model	kVA	kW
S0L1-D1	7.5	6.0
S0L1-H1	10.0	8.0
S0L1-L1	12.5	10.0
S0L1-P1	15.0	12.0
S0L2-F1*	17.5	14.0
S0L2-G1*	20.0	16.0
S0L2-M1*	25.0	20.0
S0L2-P1*	30.0	24.0

* Auxiliary winding option available (winding 711). Single-phase 230 V, 50 Hz ratings run from 7.5 kVA (S0L1-J1) to 20 kVA (S0L2-U1) on winding 05.

Choosing between S0 and the rest of the S-Range

Pick the model by continuous kVA at your site voltage, then check the standby (150/40) and 163/27 columns in the brochure if the set is rated for emergency duty only. If the load includes motors that start direct on line, ask for the auxiliary winding version of the larger cores, which the brochure lists for improved motor starting. For ratings above 30 kVA the next frame is the S1.

Range	50 Hz range, Class H (kVA)	Voltage range (V)	AVR / excitation as printed
S0	7.5-30	400/415 (50 Hz), 480 (60 Hz)	AS540, self-excited
S1	35-62.5	400/415 (50 Hz), 480 (60 Hz)	AS540, self-excited
S4	250-450	380-480	MX321, MX341 or AS440 options
S5	450-750	380-480	AS440 self-excited, PMG optional
S6	800-1400	380-690	MX321 with PMG
S7K	up to 2800	380-480	MX322 with PMG
S9LV	2800-4250 (max. continuous)	380-690	DM110 with PMG

Fitting and mounting notes

The adaptor and feet are described as easily accessible, so the same set base can take another brand of alternator without re-engineering, and the machine converts between 50 Hz and 60 Hz. Anti-condensation heaters, a diode failure detector and a remote voltage trimmer are listed as accessories. Check the SAE adaptor against the engine flywheel housing before ordering.

Documents and quotation

Seven Star LLC supplies STAMFORD S0 alternators on request from Muscat. The brochure is linked on this page. Please send the required kVA, voltage, frequency, phase, engine make and SAE housing, and say whether the set is for standby or continuous duty. Browse more generator components in Diesel Generator Spare Parts, or see a complete set such as the Cummins C150D5 150 kVA diesel generator set. Confirm winding number, rating class and mounting dimensions against the final data for your order.

Datasheets & Documents

Brochure STAMFORD S0 & S1 low voltage alternator brochure PB_S0S1_EN (EN) Download

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About brand

STAMFORD, branded STAMFORD | AvK, is the alternator maker of Cummins Generator Technologies, building brushless AC alternators and automatic voltage regulators from 7.5 to 11,200 kVA. Its heritage runs back to 1904, when the Cutting Brothers started an electrical engineering business in Stamford, England. Seven Star LLC, an independent supplier in Muscat, sources these alternators and regulators for generator builders and plant owners in Oman and the GCC.

Alternators and AVRs listed here

The pages cover the S-Range alternators S0, S1, S4, S5, S6, S7K and S9LV, the UC22 and UC27 frames, and the AS480, MX321, MX341, MX342, SX460 and DM110 voltage regulators. Each page carries the ratings and specification from the maker brochure, datasheet or owner manual, including options as printed.

Where these alternators are used

The maker names data centres, marine, telecoms, standby and critical protection, combined heat and power, rail and prime power as typical applications, on diesel and gas engines. In the Gulf these are the same standby and prime-power sets used on camps, plants and pumping stations.

Ordering parts and alternators: what we need

For an alternator, send the model, serial number, winding number, kVA, voltage and frequency from the nameplate. For a regulator, send the code printed on the existing board and the alternator model, because the right replacement depends on the excitation system.