Basler Electric BE1-87T - Manual (Page 120)

5-24 BE1-87T Test Procedures 9171300990 Rev V
This verifies the B- and C-phase differential circuits which respond together as provided earlier
in the Verification Tests: 5 Amp CT or Verification Tests: 1 Amp CT in this section. The A-phase
differential circuit sees no current and does not respond.