Beschreibung
ST-3000VA 220V to 110V step down transformer
- Output socket fitted to the enclosure, standard to order
- Tragegriff
- Input voltage selector, 110V through 240V
- ON/OFF-Schalter
- Fuse and MCB protection
- Warranty: twelve months from delivery
Funktionen
- Provides bidirectional conversion between the 110–120V and 220–240V mains classes.
- Input tap selected by hand for the supply available at the installation.
- Selector positions 110V, 120V, 220V and 240V, with custom voltages wound to order.
- Output available at 110/120V or 220/240V depending on the direction chosen.
- Applied to power tools, control panels, HVAC circuits and imported plant on site.
| Modell | Kapazität | Paketgröße (cm) | Menge/Packung |
| STU-100 | 100W | 41.5×27×38 | 12PCS |
| STU-200 | 200W | 41.5×27×38 | 12PCS |
| STU-300 | 300W | 48×29×41 | 12PCS |
| STU-500 | 500W | 48×29×41 | 12PCS |
| STU-750 | 750W | 48×29×41 | 12PCS |
| STU-1000 | 1000W | 49.5×33×21 | 2PCS |
| STU-1500 | 1500W | 49.5×33×21 | 2PCS |
| STU-2000 | 2000w | 49.5×33×21 | 2PCS |
| STU-3000 | 3000w | 54.5×33×24.5 | 2PCS |
| STU-4000 | 4000w | 54.5×33×24.5 | 2PCS |
| STU-5000 | 5000W | 54.5×33×24.5 | 2PCS |
| STU-7500 | 7500W | 42.5×33×28 | 1PCS |
| STU-10000 | 10000W | 42.5×33×28 | 1PCS |
Spezifikationen
Rated capacity: 3000VA, single phase
Primary: 220–240VAC / 110–120VAC, with front-panel selection
Secondary: 110–120VAC / 220–240VAC
Custom voltages: available for both windings on request
Type: step up & down transformer / voltage converter
Termination: cord and plug, or terminal
Socket on the body: yes
Efficiency: 80%
Supply frequency: 50/60Hz
Operating temperature range: 0°C to +40°C
Protection: fuse and MCB protection, circuit breaker
OEM / ODM: accepted with MOQ
Spare parts: by discussion
Warranty: twelve months
■ How to Choose This Transformer
Site work puts demands on a converter that domestic use does not: the equipment is moved often, connected by people who are not electricians, and expected to work on supplies that vary. Because this is a passive double-wound transformer there is no over-voltage trip, no minimum load and no start-up delay — it simply transforms whatever it is given. Size the frame for about 1,800W of resistive load, 1,000W of pump duty or 500–600W of compressor duty.
Three practical points before you order:
- the measured supply voltage and the direction of conversion required on site;
- the socket standard for your market and the plug type on the input lead;
- whether the unit will travel between locations or be fixed permanently, which changes the input connection.
■ Site Behaviour and Surge
Site loads are dominated by motors: angle grinders, core drills, compressors and pumps. An induction motor can pull five times its running current for a few hundred milliseconds, and although the transformer tolerates that short overload, it produces a voltage dip across the whole secondary circuit. If two tools are connected and one starts, the other sees the dip — so on a 3KVA frame run heavy tools one at a time. Allow 10cm of clear air on every face and bond the enclosure to the installation earth.
The output frequency always follows the input, so an ST-3000VA used on a 50Hz site delivers 50Hz — there is no frequency conversion. Where equipment is frequency-sensitive, that has to be confirmed before the transformer is specified.
Every unit is function-tested at rated load before packing and a routine test report is issued with the shipment. Export packing is a 54.5 × 33 × 24.5cm carton with two units per box and foam inserts.
Bond the enclosure to the installation earth at the stud provided and check that connection at the annual service. The transformer itself is passive, so its reliability in service depends almost entirely on the quality of the installation around it.
■ Pricing, Ordering & Quality Assurance
Step Up & Step Down Transformer Price Range (100VA–10KVA)
Pricing for the DT/ST series depends on capacity, the input/output voltage combination you need, socket type, and whether a voltage selector or MCB protection is fitted. The table below gives indicative FOB levels so you can budget before requesting a firm quotation.
| Modell | Kapazität | Input / Output Voltage | Typische Anwendung | Indicative FOB Price (per pc)* |
|---|---|---|---|---|
| ST/DT-100 | 100VA | 110V ↔ 220V selectable | Small electronics, chargers, control circuits | US$ 10–15 |
| ST/DT-200 | 200VA | 110V ↔ 220V selectable | Bench instruments, small appliances | US$ 11–16 |
| ST/DT-300 | 300VA | 110V ↔ 220V selectable | Audio equipment, laboratory benches | US$ 12-18 |
| ST/DT-500 | 500VA | 110V ↔ 220V selectable | Refrigeration units, printers, POS systems | US$ 12-20 |
| ST/DT-1000 | 1000VA | 110V ↔ 220V selectable | Power tools, kitchen equipment, single machines | US$ 21-30 |
| ST/DT-1500 | 1500VA | 110V ↔ 220V selectable | Motor-driven machines, imported appliances | US$ 23-35 |
| ST/DT-2000 | 2000VA | 110V ↔ 220V selectable | Compressors, welders, multi-outlet benches | US$ 25-37 |
| ST/DT-3000 | 3000VA | 110V ↔ 220V selectable | Small production lines, test rigs | US$ 33-43 |
| ST/DT-5000 | 5000VA | 110V ↔ 220V selectable | HVAC, industrial machinery | US$ 52-62 |
| ST/DT-7500 | 7500VA | 110V ↔ 220V selectable | Heavy workshop loads | US$ 75-87 |
| ST/DT-10000 | 10000VA | 110V ↔ 220V selectable | CNC equipment, whole-panel supply | US$ 85-112 |
* Indicative FOB Ningbo/Shanghai, standard configuration, based on 50 pcs per size. Not a formal offer — final price depends on your voltage combination, socket standard, enclosure and order quantity.
- The efficiency of the DT/ST series is 80%. For equipment with motors or compressors, the starting current will multiply — always reserve adequate power margin.
- Pure resistive / electronic loads: choose a transformer with capacity ≥ 1.5× the equipment rated power.
- Inductive loads such as motors and compressors: choose a transformer with capacity ≥ 2.5–3× the equipment rated power.
- This table is for reference only. Confirm the final solution according to the rated power and duty cycle shown on your equipment nameplate.
MOQ, Lead Time & Ordering Information
| Minimum Order Quantity (MOQ) | 1 PC for standard DT models. Smaller trial orders can be discussed for first-time buyers. |
|---|---|
| Custom / OEM orders | 50 PCS for custom voltage, custom socket layout, branded front panel or non-standard capacity. |
| Sample | 1-2 pcs sample available for verified buyers. Sample lead time 3-5 working days. |
| Vorlaufzeit | 10-20 working days for standard models after order confirmation and deposit; 15-25 working days for OEM or custom configurations. |
| Verpacken | Export carton with foam. 1/2/6 pcs per carton – see the packing table above. |
| Payment terms | 100% TT IN ADVANCE FOR RETAIL/SAMPLE; 30% TT IN ADVANCE AS DEPOSIT, THE BALANCE BEFORE SHIPMENT. |
| Shipping | FOB Ningbo. CIF and door-to-door available on request. |
| Garantie | 12 MONTHS FROM DELIVERY DATE |
Certifications & Quality Assurance
DT/ST series step up and step down transformers are produced under our ISO 9001 quality management system, and every unit is 100% function-tested before packing.
CE Certified | RoHS Compliant | IEC Tested | ISO 9001 | EMC Tested | 12-Month Warranty
Certificates and routine test reports can be issued as PDF on request, for customs clearance, tender submissions or distributor onboarding.
FAQ
1. Wie groß ist der Leistungsbereich der STU-Serie?
Die STU-Serie bietet einen Leistungsbereich von 100VA bis 5KVA, Dadurch eignet es sich für verschiedene Anwendungen, von kleinen Haushaltsgeräten bis hin zu größeren Industrieanlagen.
2. Welche Art der Spannungsumwandlung bietet dieser Transformator?
Die STU-Serie bietet sowohl Aufstockung (110V bis 220V) und Abstieg (220V auf 110V), so dass es in Regionen mit unterschiedlichen Spannungsstandards oder für den Betrieb von Geräten, die eine bestimmte Spannung benötigen, eingesetzt werden kann.
3. Was sind die typischen Anwendungen dieses Transformators?
Die STU-Serie wird üblicherweise in folgenden Bereichen eingesetzt:
- Wohnliche Einstellungen (z. B. Verwendung importierter Geräte mit anderen Spannungsanforderungen)
- Büroumgebungen (z. B. Stromversorgung für internationale Bürogeräte)
- Industrielle Anwendungen (z. B. Maschinen, die eine Spannungsumwandlung erfordern)
Er ist ideal für alle Situationen, in denen eine Umstellung von 110VAC auf 220VAC erforderlich ist.
4. Was sind die Vorteile der Ringkerntransformator-Konstruktion?
Das Ringkerntransformator-Design der STU-Serie bietet mehrere Vorteile:
- Höhere Effizienz, Dadurch wird der Energieverlust während des Betriebs reduziert.
- Geringere elektromagnetische Störungen (EMI), Dadurch werden Rauschen und Interferenzen mit empfindlicher Elektronik minimiert.
- Kompakte Größe, Dadurch wird die Installation in Umgebungen mit wenig Platz erleichtert.
5. Verfügt die STU-Serie über Schutzfunktionen?
Ja, die STU-Serie umfasst wichtige Schutzfunktionen wie z. B:
- Überlastungsschutz, die Schäden durch zu hohen Strom verhindert.
- Kurzschlussschutz, die einen sicheren Betrieb durch Schutz vor elektrischen Fehlern gewährleistet.
Diese Merkmale gewährleisten eine zuverlässige und sichere Leistung bei der Spannungsumwandlung.
Angebot anfordern
Teilen Sie uns Ihre Anforderungen, die Menge oder den Anwendungsfall mit, und wir unterbreiten Ihnen ein maßgeschneidertes Angebot.
