About Tianjin Grewin Technology Co., Ltd. - Electric Transformers Supplier in China

Located in China, Tianjin Grewin Technology Co., Ltd. currently offers 21 distinct products in its online catalogue. The listed items span electric transformers, electric sensors, inductors and transducers, as well as other electric components and alarm devices. The product set includes wound‑core 24 V transformers, toroidal power transformers for 110 V‑220 V applications, high‑frequency Rogowski coil current transformers and waterproof outdoor units. All items are classified under HS chapter 85, with transformers typically recorded under heading 8504 and current sensors under heading 9026. The supplier’s catalogue reflects a focus on both low‑voltage power conversion and precision current measurement equipment.

The catalogue’s 21 entries contain a mix of standard and custom designs, such as PCB‑mounted toroidal transformers, IEC‑rated waterproof transformers and clamp‑on Rogowski coils. Product descriptions reference common industry specifications including voltage ratings from 12 V to 220 V, power capacities up to 200 VA, frequency ranges up to 500 kHz for high‑frequency units, and IEC 60384 compliance for safety. Sensors are listed with current ranges up to 1000 A and Hall‑effect outputs of 200 mA, aligning with typical IEC 60747 standards for current transducers. The supplier also mentions LED‑based overhead line fault indicator alarms, which fall under HS heading 8531 for signalling devices.

Product Range and Specialties of Tianjin Grewin Technology Co., Ltd.

The listed catalogue covers wound‑core 24 V transformers, toroidal power transformers (110 V‑220 V), high‑frequency RM‑type transformers, and specialized units such as waterproof outdoor toroidal transformers and IEC‑compliant models. Current‑measurement products include split‑core and clamp‑on Rogowski coils, Hall‑effect sensors with 200 mA output, and 1000 A input sensors. In the transformer market, typical grades are defined by voltage class (e.g., 12 V, 24 V, 110 V, 220 V), power rating (from 10 VA to 250 VA), and insulation class (class B or F). High‑frequency transformers are usually specified by ripple current tolerance (often ≤ 5 % at 500 kHz) and core loss (≤ 0.2 W/kg). Rogowski coils are evaluated by bandwidth (commonly 10 kHz‑500 kHz) and measurement accuracy (±1 % of full‑scale).

Industry practice for these categories expects IEC 60384‑14 for power transformers, IEC 61869‑2 for instrument transformers, and IEC 60747‑4 for Hall‑effect current sensors. Buyers often request material data sheets indicating ferrite or powdered‑iron core composition, copper winding resistance, and temperature rise limits. For waterproof transformers, IP‑rating (typically IP65) and IEC 60529 compliance are standard requirements. Custom PCB‑mounted toroidal transformers are usually supplied in standard PCB footprints (e.g., 10 mm × 10 mm) and may carry RoHS certification for lead‑free compliance.

Trade and Export Information - Tianjin Grewin Technology Co., Ltd.

China is a major exporter of electrical transformers and instrument transducers, with shipments primarily destined for Southeast Asia, Europe and North America. HS chapter 85 (electrical machinery) governs most of the items listed; transformers fall under heading 8504, while current transformers and Rogowski coils are classified under heading 9026 for measuring and testing instruments. International buyers typically require IEC test reports, CE marking for EU markets and, where applicable, UL certification for North America. Export logistics for these products usually involve wooden crates or reinforced cardboard boxes, loaded in 20‑foot or 40‑foot containers, with Incoterms such as FOB Tianjin or CIF destination port. Chinese manufacturers often provide factory‑issued conformity certificates and may arrange third‑party inspection under AQSIQ or CTC standards before shipment.

Sourcing from Tianjin Grewin Technology Co., Ltd. - Buyer Guidance

When sourcing from Tianjin Grewin Technology, buyers should request IEC 60384 test certificates for transformer safety, as well as RoHS compliance statements for any PCB‑mounted units. For current sensors and Rogowski coils, a calibrated performance report showing bandwidth, linearity and temperature stability is advisable. Verify the IP‑rating for any waterproof transformer and confirm that the IEC 60529 rating matches the intended installation environment. Samples of the core material (ferrite or powdered‑iron) and winding resistance can help assess loss characteristics before placing larger orders. Ensure that the supplier can provide a detailed packing list, container loading plan and HS code declaration to facilitate customs clearance.

What types of transformers does Tianjin Grewin Technology list in its catalogue?

The catalogue includes wound‑core 24 V transformers, toroidal power transformers for 110 V‑220 V, high‑frequency RM‑type transformers, waterproof outdoor toroidal units and custom PCB‑mounted toroidal transformers.

Which HS codes are applicable to the listed transformer products?

Transformers are generally classified under HS chapter 85, heading 8504, while instrument transformers such as current sensors fall under heading 9026.

What voltage and power ratings are offered for the toroidal transformers?

Typical voltage ratings range from 12 V to 220 V, with power capacities up to 200 VA (e.g., 12 V / 24 V 100 VA‑200 VA models).

What specifications should a buyer check for the Rogowski coil current transformers?

Buyers should verify bandwidth (10 kHz‑500 kHz), measurement accuracy (±1 % of full‑scale), and the rated current range, which in the catalogue reaches 1000 A.

Are there any environmental or safety certifications mentioned for these products?

The facts do not list specific certifications, so buyers should request IEC test reports, RoHS compliance statements and, where required, CE or UL certification.

What packaging and shipping formats are typical for these electrical components?

Exporters usually pack transformers in wooden crates or reinforced cartons, load them in 20‑foot or 40‑foot containers, and ship under Incoterms such as FOB Tianjin or CIF to the destination port.

How can a buyer confirm the waterproof rating of the outdoor transformer models?

Ask for the IP‑rating documentation; the standard for outdoor units is typically IP65, confirming protection against dust and water jets.

What documentation is recommended before ordering high‑frequency transformers?

Request IEC 60384‑14 test certificates, core loss data sheets, and a frequency response chart to ensure the unit meets the required 500 kHz performance.