installation and operation Manual

Table 1-1. Electronic RMS Trip Units
3 Pole
Electronic RMS Trip Unit type Catalog Numbers
Trip Unit Functions
LS LSI LSG LSIG
Long Delay Fixed Ampere
Rating¬ with
Fixed Long Delay
Adjustable ampere
Setting with fixed
Long Delay
l
l
l
l
l
l
l
l
Short Delay Adjustable Short
Delay Pick-up with
Short Delay Time
l
2
t Ramp
Adjustable Short
Delay Time® with
Adjustable Short
Delay Pick-up, or
Adjustable
Instantaneous
Pick-up®
l
l
l
l
l
l
Instant Fixed
Instantaneous
(Override)¯
ll ll
Ground Adjustable Ground
Fault Fault Pick-up with
Adjustable Ground
Fault Time
ll
Fourth 100% rating for
Pole fourth pole
Protection
60% rating for
fourth pole
Fourth pole
unprotected
¬ Fixed rating plugs available, see Table 1-2
 Optional four-setting adjustable rating plugs available, see Table 1-2
® Using trip unit with adjustable short delay time (LSI, LSIG), instantaneous pick-up is achieved when the lowest time delay setting
(1) is selected.
¯ A non-adjustable override setting is set at the frame withstand rating.
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40752-072(2) Effective 6/02