Product Overview
This phase-selective short-circuit indicator Sigma 2.0 from HORSTMANN detects, displays, and sends remote signals for short-circuit currents in medium-voltage grids. The Sigma 2.0 measures current via three single-phase current sensors and offers optional fixed trigger values or self-adjustment based on operating current.Features
- Phase-selective short-circuit indication with three separate LED indicators (L1, L2, L3).
- Choice of tripping criterion: fixed response values or self-adjustment based on operating current (IB).
- AC/DC variant with external auxiliary voltage and capacitor backup for LED operation for up to 8 hours in case of auxiliary voltage failure.
- Settings via DIP switch behind the front panel and test/reset button for commissioning and verification.
Typical Applications
Sigma 2.0 is used to detect and display short-circuit currents in medium-voltage networks and to activate potential-free remote signaling when set response values are exceeded. Indication and remote signaling can be used for subsequent troubleshooting or connection to monitoring systems where phase-selective information is required.Documentation
The manufacturer's product information is the basis for this text. Manufacturer's product pageSpecifications
- Product: Sigma 2.0
- Manufacturer: HORSTMANN
- Manufacturer item number: 37-1121-101
- Trigger values (short-circuit current): 200, 300, 400, 600, 800, 1,000, 2,000 A or self-adjustment depending on operating current (IB)
- Self-adjustment: IB < 100 A → I>> = 400 A; IB > 100 A → I>> = 4 × IB
- Response time (tI>>): 40 ms or 80 ms (adjustable)
- Response tolerance: ±5 % (0–630 A), ±10 % (>630 A)
- Display: 3 red LEDs (phase-selective display L1, L2, L3)
- Remote signal: 1 potential-free relay contact; contact data: 230 V AC / 1 A / 62.5 VA max.; 220 V DC / 1 A / 60 W max.
- Reset: Push-button (local) and automatic time reset 1, 2, 4 or 8 hours
- Supply: CT-powered; AC/DC variant: external auxiliary voltage 24–230 V AC/DC
- Internal energy source: Long-life lithium cell, lifespan ≥20 years, >900 h total blinking time
- AC/DC variant: Capacitor backup for LED operation max. 8 hours in case of auxiliary voltage failure
- Housing material and enclosure: Polycarbonate, IP40
- Temperature range: -40 °C to +70 °C
- Settings: DIP switch behind front panel
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