The SFD-8 analog switch circuit breaker is an improved device used for the whole group test of power system power-off protection devices or complete relay protection screens. It can simulate the opening and closing time of the circuit breaker, avoiding adverse effects on the circuit breaker due to repeated tests.
The SFD-8 analog switch breaker is an improved version of the SFD-7, designed for testing power system protection devices and relay panels by accurately simulating breaker opening and closing times. It uses a fully digital circuit with selectable impedance and phase operation modes.
The manual details power supply requirements, voltage selection, impedance options, timing settings, and safety precautions. It also lists the included accessories and warranty terms for the equipment. This manual is written in Chinese.
| Power supply voltage | AC200V±10% |
|---|---|
| Operation voltage | DC220V, DC110V |
| Impedance selection | 400Ω, 200Ω, 110Ω |
| Close time range | 20‑200 ms |
| Trip time range | 20‑100 ms |
| Contact rating | AC220V/5A |
It requires an AC200V±10% supply.
Both times are set with a digital dial switch; trip time 20‑100 ms and close time 20‑200 ms.
The device allows selection of 400 Ω, 200 Ω, or 110 Ω impedance.
Check that the power voltage is within the operating range and handle the unit gently during storage or transport.