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Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section 4—Trip Units
© 1995–2003 Schneider Electric All Rights Reserved
13
Indications Load indication (LED) in front (6):
• Lights solid at 90% of Ir threshold
• Flashes at >105% or greater of Ir threshold
Test Test connector in front (7) for connection to test kit to check circuit breaker operation after fitting the trip
unit or other accessories.
Setting Example Question: What is the overload protection threshold of a Compact NSJ400 circuit breaker equipped
with trip unit STR23SP where Io = 0.5 and Ir = 0.8?
Answer: In x Io x Ir = 400 x 0.5 x 0.8 = 160 A
The same trip unit with the same settings, mounted on an NSJ600 circuit breaker will have the following
tripping threshold: In x Io x Ir = 600 x 0.5 x 0.8 = 240 A.
400 x 0.5 x 0.8 = 160 A
x In
Ir
x Io
.8
.85
.9
.95
1
.88
.93
.98
Io
.5
.63
.7
.9
1
.8
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