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DIR 1000587R0002 (Version 02)
2. LSIG Trip Unit
2.1. Overview
2.2. Main specifi cations
LSIG is an electronic device for AB 140G-N/140 G-NS/140G-R range of three-pole and four-pole Molded Case circuit breakers
with functions for monitoring and for protecting against abnormal currents.
The trip unit installed on the circuit-breaker is connected to the current sensors for primary current reading, and to the Trip Coil
for the circuit-breaker opening command.
The sensors provide the primary current measurement and energy for powering the trip unit even in the absence of external
power supply.
Connected directly to an opening mechanism, the Trip Coil allows the CB to open. The control is transmitted to the Trip coil in
accordance with the protection settings.
Dip switches on the front allow the main protections and settings to be adjusted, while the state of the trip unit is indicated by
the leds of the front interface.
2.2.1. Protections
Symbol Protection against
L overload with inverse long time delay
S overload with adjustable short time delay
I instantaneous short-circuit
G earth (ground) fault with adjustable delay
2.2.2. Functions
LSIG includes various different functions:
- Runtime measurement of the phase current and peak factor;
- Autotest: continuous monitoring of the main connections to the trip unit, among which: current sensors, trip coil, rating plug,
circuit-breaker state.
2.2.3. Accessories
- External neutral, current sensor for protecting the external neutral pole (can only be confi gured for three-pole circuit-breakers).
More details are given from page page 36 of chapter 4, or in the dedicated manuals.
GI
S
L
Service Connector - Battery Test (Input)
Battery Unit Catalog No:140G-ELBU [purchased separately]
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