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DIR 1000587R0002 (Version 02)
1. LSIG and LSIG-MM Trip Units Functional Comparison
Function/Unit LSIG LSIG-MM
Current protections (L, S, I, G)
SS
Additional protections (U, OT, MM)
-S
Thermal memory - S
Maintenance mode - S
Battery unit O S
Key:
S : standard function/unit,
O : optional function/unit,
- : function/unit unavailable.
1.1. Compatibility between trip units and CB
CB / trip unit LSIG LSIG-MM
140G/N/140G-NS X X
140G-R X X
1.2. Abbreviations
Abbreviations Meaning
Battery Power supply unit
BA Opening coil
BC Closing coil
CB Circuit-Breaker
CS Current Sensor (current transformer)
Trip unit Also called “protection unit”
HW Hardware
In Rated current of the Rating Plug installed in the circuit breaker
LSIG Trip unit for CB 140G-N/140G-NS/140G-R
LSIG-MM Trip unit for CB 140G-N/140G-NS/140G-R
MT Thermal memory
RMS
Root mean square value
TC Trip Coil (opening solenoid)
SW Software
iTest “Info/test” button on the front of the trip unit
Trip CB opening, generated by the trip unit
OT Over Temperature
1.3. Safety Notes
Read this manual carefully and completely: use of the trip units should be reserved to qualifi ed electrical personnel only.
ATTENTION: this symbol highlights information about operations, actions or circumstances that can cause
injuries to the personnel, damage to the trip unit or economic losses.
It is consider unsafe to operate this circuit breaker if:
1. The trip unit shows visible signs of damage.
2. The trip unit does not function (e.g. with autotest or by means of the trip test unit).
The circuit breaker must be taken out of service. Use lockout tagout procedure per NFPA 70E, or local regulation.
ATTENTION: Prior to servicing and/or replacing, the circuit-breaker must be open.
Remember to disconnect the circuit breaker from power source(s).
1.3.1. Notes for dielectric tests
ATTENTION:
Dielectric withstand tests shall not be performed on the inputs or outputs of the trip unit, to prevent possible
damage to the electronics.
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