9252000899 Rev — BE1-50/51B-237/-238 General Information i
SECTION 1 •GENERAL INFORMATION
TABLE OF CONTENTS
SECTION 1 •GENERAL INFORMATION ................................................................................................ 1-1
INTRODUCTION.................................................................................................................................... 1-1
FEATURES............................................................................................................................................ 1-1
SPECIFICATIONS ................................................................................................................................. 1-2
Time Overcurrent (51) Element.......................................................................................................... 1-2
Instantaneous Overcurrent A (50-A) Element .................................................................................... 1-2
Instantaneous Overcurrent B (50-B) Element .................................................................................... 1-3
Current Sensing Input ........................................................................................................................ 1-3
Frequency Response ......................................................................................................................... 1-5
Transient Response ........................................................................................................................... 1-5
Harmonic Rejection ............................................................................................................................ 1-5
Target Indicators ................................................................................................................................ 1-6
Output Contacts ................................................................................................................................. 1-6
Type Tests.......................................................................................................................................... 1-7
Environment ....................................................................................................................................... 1-7
Physical .............................................................................................................................................. 1-7
Figures
Figure 1-1. Current Sensing Input Derating Curve (BE1-50/51B-237)...................................................... 1-3
Figure 1-2. Current Sensing Input Derating Curve (BE1-50/51B-238)...................................................... 1-4
Figure 1-3. Current Sensing Input Burden (BE1-50/51B-237) .................................................................. 1-4
Figure 1-4. Current Sensing Input Burden (BE1-50/51B-238) .................................................................. 1-5
Figure 1-5. Harmonic Rejection................................................................................................................. 1-6
Tables
Table 1-1. GE IAC Relays Suitable For Direct Replacement.................................................................... 1-1
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