Alpha

The Alpha is designed to detect, display and remotely indicate short-circuit faults in medium voltage distribution networks.

The indication is tripped by a short-circuit current and remains active until the device is reset.

Equipment set includes:

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Alpha E \| Alpha M
Earth fault detection methods
Earth fault detection methods	Earth short-circuit
Neutral system
Low-impedance/short-term low-impedance earthed	---
Isolated earthed	-
Resonant earthed	-
Short-ciruit trip current
Short-circuit trip current	400, 600, 800, 1,000 A
Response delay short-circuit	100 ms
Indication
Indication	3 display elements (black / red), bi-stable type, for L1, L2, L3
Remote signal
Relay contacts	1
Remote contact	Potential-free permanent and momentary contact (>100 ms) Contact capacity: 230 V AC/1 A/62.5 VA max. 220 V DC/1 A/60 W max.
Power supply
Internal power supply	Long-life lithium cell, shelf life ≥20 years, total flashing time >1,000 h (Alpha E)
CT powered	---
Reset Alpha
Alpha E: Reset	By button Remote reset: 12 – 60 V AC/DC ±10 % Automatic time reset: 2 or 4 h
Alpha M: Reset	Via rotary knob
Mechanical data
Housing	Polycarbonate, IP40
Temperature range	-30 to +70 °C