This document introduces the usage instructions, applicable scope, main functions, and technical specifications of the SF-3R thermal relay tester produced by Qingdao Sifang Taihe Electric Equipment Co., Ltd. The tester can be used for calibration and verification of various thermal relays and motor protection devices, and is widely used in electrical testing sites of power systems, railways, petrochemicals, metallurgy, and mining enterprises.
The SF-3R hot relay tester is designed for calibrating and verifying motor protection devices, thermal relays, and thermocouples in power‑system test sites such as railways, petrochemical plants, and mines. It features long‑duration current output (0‑50 A or 0‑500 A) and synchronized testing of multiple devices, with a simple microcontroller‑based interface.
The manual explains the applicable scope, main functions, technical specifications, operation steps, safety precautions, and warranty conditions. Users are guided on power connection, current‑output adjustment, and proper handling to ensure accurate test results and reliable operation. This manual is written in Chinese.
| Power Input | AC 380/220V 50Hz three‑phase four‑wire |
|---|---|
| Rated Power | 1 × 1 kVA |
| Instrument Grade | 0.5 |
| Output Current (continuous) | 0–50 A or 0–500 A |
| Output Current (multiple channels) | 3×50 A or 3×500 A (customizable to 0‑10000 A) |
| Weight | 30 kg |
The tester can continuously output 0–50 A or 0–500 A, and with three channels it can deliver 3×50 A or 3×500 A, customizable up to 10 000 A.
Connect the A, B, C, N terminals to a three‑phase four‑wire AC supply, then link the current‑output terminals and switch‑input terminals to the relay under test using the dedicated test leads.
Store the instrument at temperatures between 0 °C and 30 °C with relative humidity not exceeding 85 % and keep the environment free of corrosive contaminants.