الوصف
ST-3000VA 220V to 110V step down transformer
- Output socket fitted to the enclosure, standard to order
- مقبض الحمل
- Input voltage selector, 110V through 240V
- مفتاح التشغيل/إيقاف التشغيل
- Fuse and MCB protection
- Warranty: twelve months from delivery
الوظائف
- 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.
| الطراز | الطاقة الاستيعابية | حجم العبوة (سم) | الكمية/الحزمة |
| STU-100 | 100W | 41.5×27×38 | 12 قطعة |
| STU-200 | 200W | 41.5×27×38 | 12 قطعة |
| STU-300 | 300W | 48×29×41 | 12 قطعة |
| STU-500 | 500W | 48×29×41 | 12 قطعة |
| STU-750 | 750W | 48×29×41 | 12 قطعة |
| STU-1000 | 1000W | 49.5×33×21 | 2 قطعة |
| STU-1500 | 1500W | 49.5×33×21 | 2 قطعة |
| STU-2000 | 2000w | 49.5×33×21 | 2 قطعة |
| STU-3000 | 3000w | 54.5×33×24.5 | 2 قطعة |
| STU-4000 | 4000w | 54.5×33×24.5 | 2 قطعة |
| STU-5000 | 5000W | 54.5×33×24.5 | 2 قطعة |
| STU-7500 | 7500W | 42.5×33×28 | 1 قطعة |
| STU-10000 | 10000W | 42.5×33×28 | 1 قطعة |
المواصفات
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.
| الطراز | الطاقة الاستيعابية | Input / Output Voltage | تطبيق نموذجي | 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 | 500 فولت أمبير | 110V ↔ 220V selectable | Refrigeration units, printers, POS systems | US$ 12-20 |
| ST/DT-1000 | 1000 فولت أمبير | 110V ↔ 220V selectable | Power tools, kitchen equipment, single machines | US$ 21-30 |
| ST/DT-1500 | 1500 فولت أمبير | 110V ↔ 220V selectable | Motor-driven machines, imported appliances | US$ 23-35 |
| ST/DT-2000 | 2000 فولت أمبير | 110V ↔ 220V selectable | Compressors, welders, multi-outlet benches | US$ 25-37 |
| ST/DT-3000 | 3000 فولت أمبير | 110V ↔ 220V selectable | Small production lines, test rigs | US$ 33-43 |
| ST/DT-5000 | 5000 فولت أمبير | 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 | 10000 فولت أمبير | 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. |
| المهلة الزمنية | 10-20 working days for standard models after order confirmation and deposit; 15-25 working days for OEM or custom configurations. |
| التعبئة | 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. |
| الضمان | 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.
الأسئلة الشائعة
1. ما هو نطاق سعة الطاقة لسلسلة STU؟
إن سلسلة STU توفر سعة طاقة تتراوح من 100 فولت أمبير إلى 5 كيلو فولت أمبير, مما يجعلها مناسبة لمختلف التطبيقات، من الأجهزة المنزلية الصغيرة إلى المعدات الصناعية الكبيرة.
2. ما نوع تحويل الجهد الذي يوفره هذا المحول؟
توفر سلسلة STU كلاً من تصعيد (110 فولت إلى 220 فولت) و التنحي تحويل الجهد (220 فولت إلى 110 فولت)، مما يسمح باستخدامه في مناطق ذات معايير جهد مختلفة أو لتشغيل الأجهزة التي تتطلب جهدًا محددًا.
3. ما هي التطبيقات النموذجية لهذا المحول؟
تُستخدم سلسلة STU بشكل شائع في:
- الإعدادات السكنية (على سبيل المثال، استخدام الأجهزة المستوردة ذات متطلبات الجهد الكهربائي المختلفة)
- البيئات المكتبية (على سبيل المثال، تشغيل المعدات المكتبية الدولية)
- التطبيقات الصناعية (على سبيل المثال، الآلات التي تتطلب تحويل الجهد)
وهي مثالية لأي حالة يكون فيها التحويل بين 110 فولت تيار متردد و220 فولت تيار متردد ضرورياً.
4. ما هي مزايا تصميم المحول الحلقي؟
يوفر تصميم المحول الحلقي في سلسلة STU العديد من المزايا:
- كفاءة أعلى, مما يقلل من فقد الطاقة أثناء التشغيل.
- انخفاض التداخل الكهرومغناطيسي (EMI), مما يقلل من الضوضاء والتداخل مع الإلكترونيات الحساسة.
- حجم صغير الحجم, مما يجعل تركيبها أسهل في البيئات محدودة المساحة.
5. هل تتضمن سلسلة STU أي ميزات حماية؟
نعم، تتضمن سلسلة STU ميزات حماية مهمة مثل:
- الحماية من التحميل الزائد, مما يمنع التلف الناتج عن التيار الزائد.
- حماية من قصر الدائرة الكهربائية, والتي تضمن التشغيل الآمن من خلال الحماية من الأعطال الكهربائية.
تضمن هذه الميزات أداءً موثوقاً وآمناً أثناء تحويل الجهد.
طلب عرض أسعار
أخبرنا بالمواصفات أو الكمية أو سيناريو الاستخدام، وسنرد عليك بعرض أسعار مخصص.
