1-6
BE1-50/51B-235/-236 General Information
9252000898 Rev —
Frequency Response
A change of
±
5 Hz from the nominal 50/60 Hz current causes <0.5% change in the current required for
pickup.
Transient Response
<10% overreach with system time constants up to 40 ms.
Harmonic Rejection
Rejection of odd and even harmonics is illustrated in Figure 1-5.
Figure 1-5. Harmonic Rejection
Target Indicators
A gravity-latched, manually-reset, current-operated target indicator is provided for the time-overcurrent
(51) trip output and the instantaneous overcurrent A (50-A) trip output. A target indicator is not provided
for the 50-B trip output. The level of trip circuit current required to operate each target is individually
controlled by a circuit board jumper. See Section 2,
Controls and Indicators
for jumper locations and
function assignments
Minimum Operating Current
Jumper Position—Pins 1 and 2:
0.9 to 2.25 A
∗
Jumper Position—Pins 2 and 3:
80 mA to 200 mA
∗
∗
Minimum operating current values. See
Output Contacts
for the maximum acceptable levels of
trip circuit currents.
Output Contacts
Output contacts are surge protected and rated as follows.
Resistive Ratings
120/240 Vac:
Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3
amperes continuously, and break 5 amperes.
125/250 Vdc:
Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3
amperes continuously, and break 0.3 ampere.
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