Protection Settings
30
TemBreak PRO P_BE-UM-001-EN V1.3.0
Adjusting I
sd
(Current)
The I
sd
trip threshold tolerance for STD protection is ±10%.
Adjustments to I
sd
can be made via the I
sd
adjustment dial, which is represented as a multiple of I
r
.
For example: I
r
is set to 120A, I
sd
dial in position 5 sets I
sd
to 5 x 120A = 600A (±10%).
Notice: For the following MCCBs the setting of I
r
and t
r
can limit the setting of I
sd
for STD protection.
P160_BE I
n
= 160A, P250_BE I
n
= 250A
If: I
r
> 0.9 x I
n
and t
r
= 16s I
sd
is limited to 9 x I
r
. even if the dial is set to 10x
Notice: In the case where STD protection is disabled (I
sd
= OFF), thermal self-protection parameters I
tsp
and t
tsp
are automatically enabled on the following trip units:
P160_BE I
n
= 160A, P250_BE I
n
= 250A
In this case, a supplementary I²t = K curve is added to the end of LTD tripping curve, starting from I
tsp
, where
constant K = Max(I
i
)² x t
tsp
.
Max(I
i
) is the maximum I
i
settable on the trip unit and is not adjustable.
Refer to Thermal Self-Protection section.
To Next Page
Loading...
