• Due to three available binary input modules, the B20A is intended for applications
without need for dynamic Zone Selection such as substations with single busbar
with or without bus-section breaker,
breaker-and-a-half or double breaker
arrangements. Three such IEDs offer cost effective solutions for such simple
substation arrangements with up to twelve CT inputs.
• This version can be used with external auxiliary 3-phase to 1-phase summation
current transformers with different turns ratio for each phase.
1MRK 505 370-UUS A Section 3
Configuration
Busbar protection REB670 2.2 ANSI 59
Application manual
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