Siemens I-T-E Sensitrip MD Series Information And Instruction Manual page 10

MD and ND-Frame Trip Adjustments
Figure 1
I = Maximum circuit breaker ampere rating.
n
I = Current Rating—a function of continuous ampere adjust-
r
ment setting expressed in % of I
Adjustable Short Time Pickup
x I
r
SMD/SND models with an adjustable short time pickup
switch allow for selection of short time pickup in a range from
1.5 to 10 times the setting of the Adjustable Continuous
Amps Switch. The OFF position disables the function. See
Figure 1 for the possible settings for this switch.
8
n
I = Ground Fault Pickup—a function of adjustment setting
g
expressed in % of I .
n
Adjustable Short Time Delay
Seconds
SMD/SND models with an adjustable short time delay switch
allow for selection from two modes of short time delays. The
first range of settings enable the breaker to be set for fixed
time delays of .05, .1, .2, .3 or .5 seconds. The second range
of settings enable the breaker to be set for short time delays
based on 12t curves at six times the continuous amps setting.
See Figure 1 for possible settings for this switch.