Brochure

PowerPact H-, J-, and L-Frame Circuit Breakers
Trip Units
90
02/2016 © 2011–2016 Schneider Electric
All Rights Reserved
Power Requirements
The amount of current needed to power the trip unit is printed in the upper left hand corner of the trip
unit by the Ready LED.
Protection
Settings can be adjusted in two ways, using the rotary switches and/or the keypad.
• The keypad can be used to make fine adjustments in 1 A steps below the maximum value defined
by the setting on the rotary switch.
• Access to setting modifications using the keypad is protected by a locking function displayed on the
screen and controlled by a microswitch.
• The lock is activated automatically if the keypad is not used for 5 minutes.
• Access to the microswitch is protected by a transparent, sealable cover.
• With the cover closed, it is still possible to display the various settings and measurements using the
keypad.
Overloads: Long-Time Protection (I
r
)
Inverse time protection against overloads with an adjustable current pick-up I
r
is set using a rotary
switch or the keypad for fine adjustments. The time delay t
r
is set using the keypad.
Short-Circuits: Short-Time Protection (I
sd
)
Short-circuit protection with an adjustable pick-up I
sd
and adjustable time delay t
sd
, with the possibility
of including a portion of an inverse time curve (I
2
t On).
Short-Circuits: Instantaneous Protection (I
i
)
Instantaneous protection with adjustable pick-up I
i
.
Additional Ground Fault Protection (I
g
) on Micrologic 6 Trip Units
Residual type ground-fault protection with an adjustable pick-up I
g
and adjustable time delay t
g
.
Possibility of including a portion of an inverse time curve (I
2
t On).
Neutral Protection
• On four-pole circuit breakers, this protection can be set using the keypad:
— Off: neutral unprotected
— 0.5: neutral protection at half the value of the phase pick-up (0.5 x I
r
)
— 1.0: neutral fully protected at I
r
— OSN: Oversized neutral protection at 1.6 times the value of the phase pick-up.
Used when there is a high level of 3rd order harmonics (or orders that are multiples of 3) that
accumulate in the neutral and create a high current. In this case, the device must be limited to
I
r
= 0.63 x I
n
for the maximum neutral protection setting of 1.6 x I
r
.
• With three-pole circuit breakers, the neutral can be protected by installing an external neutral
sensor with the output (T1, T2) connected to the trip unit.
Table 65: Trip Unit Power Requirements
Frame Power-Up Requirement
H-Frame, 60 A
60 A > 15 A
100 A > 15 A
150 A > 30 A
J-Frame, 250A 250A > 30 A
L-Frame, 600 A
400 A > 50 A
600 A > 50 A