Fluid indicator — mechanical short-circuit indicator from HORSTMANN
The Fluid indicator is a mechanical short-circuit indicator designed for the detection of short-circuit currents in medium-voltage distribution networks and for monitoring underground cables. The device is triggered by the magnetic field (H) induced by I>> trip signals. When a short circuit occurs, the mixer element is lifted by the magnetic field and touches the red particles in the liquid, creating a visual fault indication. The indication automatically resets over time as the particles sink to the bottom.
Functional features
- Fault indication using liquid with red particles.
- Mechanical tripping via magnetic field induced by I>> events.
- Automatic reset approx. 6–8 hours after tripping.
- Retrofit-ready and maintenance-free (no battery).
- Can be mounted directly on cables or busbars (as specified by the manufacturer).
Typical applications
The Fluid indicator is used for monitoring and detecting short-circuit currents in underground cables and in medium-voltage distribution networks where mechanical visual fault indication is required. It is characterized as a mechanical short-circuit indicator product, suitable for installation on cables or busbars according to the manufacturer's product description.
Documentation
The manufacturer's website states that all relevant documents (brochures, technical reports, operating manuals, and objectives) can be found in Horstmann's download area (login may be required).
Specifications
- Product name: Fluid indicator.
- Manufacturer: HORSTMANN.
- Manufacturer's article number: 20-1304-000.
- Fault type/detection: Earth fault / short-circuit current (I>>).
- Trip currents (factory setting): 400, 600, 1,000 A.
- Response time tI>>: 200 ms at nominal trip signal (100 ms available on request).
- Accuracy: ±20 %.
- Reset: Automatic reset after approx. 6–8 hours.
- Housing material: Housing and mounting screws in polyamide; iron bracket/yoke in ferromagnetic steel.
- Temperature range: -40 °C to +85 °C.
- Other characteristics: Maintenance-free, no battery, retrofit-ready.
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