Toshiba Current Relay RC803A-HP1 Instruction Manual page 17

(6) If the relay does not operate in the above test, check if
the current setting is correct or if the ingut signal is
above the set detection value.
correct, check the operation of the relay by gradually
reducing the setting of the current adjusting knob.
relay still does not ooerate. it is defective.
please contact the dealer froa which you purchased the relay
or Toshiba.
Power Source -
Detected current
Overcurrent
detect ion -
Undercurrant
detect ion
I
T2: Overcurrent detecting resgonse delay tiler
T3: Undercurrent detecting resgonse delay tlaer
Fig. !i Relay Operation
If the ingut signal is
In this case,
If the