Electroswitch Control switch Relays (CSR) combine the function of a
control switch with a remote controlled solenoid allowing one device to
do both the manual and supervisory control function in the control of
power circuit breakers. They eliminate the need to redesign substations
for redundant separate relays when manual substations convert to
supervisory control. CSRs provide manual or electric control switch
operation by supervisory control. The CSR looks, acts, and feels
identical to a control switch.