Sigma plus
This device is ready for retrofit: Change or replace old indicators with the Sigma plus without replacing current transformers already existing in the switchgear.
The Sigma plus features a selection switch which is used to adapt the device to all current transformers.
Equipment set includes:
- 1 display unit
- Retrofit solution for old devices without replacing existing current transformers
- Can be adjusted to all common Horstmann current transformers
- Indication by high-intensity LEDs with a viewing angle of 180 degrees
- Load-dependent self-adjustment or fixed setting
- Single and double flash mode for operation in radial and ring networks
Your advantages
- Quick and easy upgrade of the switchgear
- Only replacement of the indicator necessary
Technical specifications
| Earth fault detection methods | Earth short-circuit |
|---|---|
| Low-impedance/short-term low-impedance earthed | --- |
| Isolated earthed | - |
| Resonant earthed | - |
| Short-circuit trip current | (100), 200, 300, 400, 600, 800, 1,000 A, self-adjustment |
| Response delay short-circuit | 40, 80, 200, or 300 ms |
| Indication | Short-circuit: 3 red LEDs (L1, L2, L3), short-circuit/earth fault: 3 red LEDs (L1, E, L3) |
| Relay contacts | 2 |
| Remote contact | Potential-free permanent or momentary contact (>1 s) Contact capacity: 230 V AC/1 A/62.5 VA max. 220 V DC/1 A/60 W max. |
| Internal power supply | Long-life lithium cell, active flashing time >1,000 h, shelf life ≥20 years AC/DC version: 12 – 60 V DC ±10 %, 110 – 230 V AC ±10 % |
| External auxiliary supply | - |
| CT powered | --- |
| Alpha E: Reset | - |
| Alpha M: Reset | - |
| Housing | Polycarbonate, IP40 |
| Temperature range | -30 to +70 °C |
| Cable diameter | - |
- Changeable front panel for phase selective short-circuit or earth fault indication
- Bright LEDs
- Setting option via DIP switches
- Connection of different phase current transformers
