Product Overview
The Opto F 3.0 is a short-circuit indicator from HORSTMANN for detecting, displaying, and remote signaling of short-circuit currents in medium-voltage networks. The device can be used in both encapsulated and open medium-voltage installations and ensures potential isolation between measuring sensors and the display through the use of fiber optic cables. The Opto F 3.0 uses phase-selective LED indication in single- and double-flash mode and supports remote signaling via a relay contact.Technical Functionality
The device detects short-circuit currents and indicates which phase is affected using three phase-selective red LEDs. The Opto F 3.0 allows for local reset (push button), automatic time reset (1, 2, 4 or 8 hours), and external reset via remote contact. Short-circuit response values can be set to 400, 600, 800, or 1,000 A, and response times are adjustable.Typical Applications
- Detection of short-circuit currents in medium-voltage distribution networks.
- Use in both encapsulated and open medium-voltage systems.
- Installation on bare cables and on busbar/copper conductors (mounting with appropriate phase-current transformers and fiber optics).
Horstmann specifies matching accessories, including phase-current transformers (Art. No. 49-0101-202) and fiber optic cables (Art. No. 49-0602-009). For further technical documents and downloads, please refer to the manufacturer's product page (Horstmann).
Specifications
- Product Name: Opto F 3.0.
- Function: Short-circuit indicator for medium-voltage networks (detection, display, and remote signaling).
- Adjustable short-circuit values: 400, 600, 800, 1,000 A.
- Adjustable response times: 40, 60, 80, 100, 200, 300, 500 ms.
- Indication: Phase-selective short-circuit indication with 3 red LEDs; flashing periods: single and double flash (2 s periods, double sequence 0.3 s with 3 s periods).
- Accuracy: ±15 % (determined by the current transformer).
- Remote Signal: 1 potential-free relay contact; capacity up to 380 V AC / 5 A / 1250 VA max.; 220 V DC / 5 A / 150 W max.
- Reset: Push button, automatic time reset (1/2/4/8 h), remote reset; auxiliary power restoration ≥10 s (can be activated via DIP-switch).
- Power Supply: Internal long-life lithium cell, active flash time >1,000 h, storage time ≥20 years; possibility for external auxiliary power (12–110 V DC ±10 % or 24–60 V AC, 50–60 Hz ±10 %).
- Cable Connection: Fiber optic cables for electrical isolation between CT and display.
- Housing: Polycarbonate; IP40 built-in housing, IP65 flush-mounted housing (surface-mounted).
- Temperature Range: -30 °C to +70 °C.
Source: Horstmann product information (Opto F 3.0, manufacturer's product page).
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