Basler Electric BE1-50/51B - Manual (Page 14)

1-2 BE1-50/51B General Information 9252000991 Rev R
Figure 1-1. BE1-50/51B, S1 Case
Model Numbers
Model number variations in the BE1-50/51B overcurrent relays are specified by a three digit extension to
the model number. Tables 1-1 and 1-2 provide model number, case style, switch SW3-3 selections, and
sensing current input ranges. Internal switches provide for selecting system operating frequencies of 50
or 60 Hz, instantaneous element delays, curve sets, and instantaneous or integrating reset
characteristics. The location and description of these switches is provided in Section 2. Integrating reset is
available in 100 series relays (e.g. - BE1-50/51B-105) when there is adequate input current to power the
relay. Integrating reset is available in 200 series relays (e.g. - BE1-50/51B-205) even when the input
current falls to zero. Two-hundred series relays also have additional characteristic curves available
through curve set selection.