BLF-S5 series current sensor is used to measure direct, alternating and pulse currents. The product has the best performance/price ratio, low power consumption, easy installation, small size and light weight, highly insulated between the primary and secondary sides, perforated structure, and no insertion loss.
The BLF-S5 series is an open-loop current sensor designed for measuring DC, AC, and pulsed currents with high primary‑secondary insulation. It is available in three primary current ratings (100 A, 200 A, 300 A) and offers a compact, lightweight design.
Key specifications include a secondary rated voltage of 4 V, supply voltage 12‑15 V, power consumption 35 mA, and an operating temperature range of –10 °C to +70 °C. The sensor meets UL94‑V0 insulation standards and is suitable for applications such as VFD drives, UPS, chopper circuits, and electro‑chemical systems. This manual is written in Chinese.
| Primary rated current | 100 A / 200 A / 300 A |
|---|---|
| Secondary rated voltage | 4 V |
| Supply voltage | 12 V … 15 V (+5%) |
| Power consumption | 35 mA |
| Insulation test voltage | 2.5 kV AC, 50 Hz, 1 min |
| Operating temperature range | -10 °C to +70 °C |
| Storage temperature range | -25 °C to +85 °C |
| Weight | 200 g |
| Load resistance | >10 kΩ |
| Response time | <20 µs |
The series offers three versions: BLF100‑S5 rated for 100 A, BLF200‑S5 rated for 200 A, and BLF300‑S5 rated for 300 A primary current.
It can operate from –10 °C up to +70 °C.
The sensor draws about 35 mA of current.
Typical applications include variable‑frequency drive systems, UPS, chopper circuits, and electro‑chemical equipment.