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Compact® NSF and NSJ 150 to 600 A Circuit Breakers
Section 13—Supplementary Technical Information
© 1995–2003 Schneider Electric All Rights Reserved
62
REFLEX TRIPPING
All Compact
®
NS circuit breakers and switches incorporate the exclusive reflex tripping system.
This extremely simple system breaks very high fault currents by mechanically tripping the device via a
"piston" actuated directly by the pressure produced in the breaking units resulting from a short circuit.
For high short-circuit thermal withstand, this system provides a faster break. Reflex tripping curves are
exclusively a function of the circuit breaker rating.
5
20
10
8
7
6
4
3
2 3 4 6 10 20 30 40 60 100
200
t
(ms)
NSJ600
NSJ400**
NSF250
NSF150*
TM70DP...TM250DP
TM15DP
...TM60DP
I (kA RMS)
*4P OSN Compact
®
NSF125/250N and NSF 150/250N Ratings Are Same As NSF250
** 4P OSN NSJ 400/600N Ratings Are Same As NSJ600
06153221