Basler
Basler ES-81O Overfrequency
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Basler Electric ES Series Protection Relays provide a wide range of functions with the following common specifications:
Power Supply
All units are self-powered except for the ES-37, ES-51, ES-37/51, ES-49, ES-74S, and ES-74V relays.
ES Relay Model Nominal Sensing Input
25, 27, 59, 32, 47, 47N, 55, 81O, 81U 120, 208, 240, 380, 415 or 480 Vac* 32, 37, 51, 55 5 A (or 1 A for 55) 74S 50 or 100 mVdc 74V 1, 10, 100, or 125 Vdc 49 10 ? Cu or 100 ? Pt
Output
Relay Type: SPDT (form-C)
AC Rating:
Make and Carry: 250 V, 5 A
Break Resistive or Inductive: 0.3 A at 250 V (L/R=0.04 max.)
Applied Standards
For all ES Series Protection Relays:
IEC 60255-1 Measuring Relays and Protection
Equipment-Part 1: Common requirements
IEEE C37.90™-2005 Relays and Relay Systems
Associated with Electric Power Apparatus
IEEE C37.90.1™-2012 Surge Withstand Capability
Tests for Relays and Relay Systems Associated with
Electric Power Apparatus
IEEE C37.90.2™-2004 Withstand Capability of Relay
Systems to Radiated EMI from Transceivers
IEEE C37.90.3™-2001 ESD Tests for Protective
Relays
For ES-74S Relay only:
IEEE 421.3™-1997 For High-Potential Test
Requirements for Excitation Systems for
Synchronous Machines (for field voltages up to
600 Vdc and bridge input voltages up to 1,300 Vac)
