Explore GE Vernova
Resource Library
Get access to curated content, tools, and useful resources to help you face all your grid challenges.
Access the library
Electrification Businesses
Electrification Software
Power Conversion
Solar & Storage Solutions
 Digital Energy > Protection & Control > Pilot and Distance Relays > SCA Static Directional Comparison Blocking Auxiliary Relay
Product Lookup
Protection & Control Online Store (new window)
Protection & Control Support
Event Calendar
Protection & Control Press Room
  Support Documents
SCA Static Directional Comparison Blocking Auxiliary Relay

SCA Static Directional Comparison Blocking Auxiliary Relay

The type SCA11A relay consists of two telephone type relay units with their associated static timing and regulating circuits all mounted in a size S-1 drawout case. The type SCA11A relay is designed to provide the automatic check back of a carrier current channel from a remote unattended station.

The type SCA51A relay is a carrier auxiliary relay for use in conjunction with power line carrier or microwave channels and static protective relaying equipment in directional comparison relaying schemes. The relay includes five separate relay functions which can be used singly or in combination. The desired mode of operation is selected by means of internal links and by making the appropriate external connections. The relay also includes a target.

The type SCA52A relay is similar in functionality to the SCA51A but with six relay functions.

End of life notice: The SCA has been discontinued as of October 1, 2013.
Read full notice.