GE Industrial Solutions MicroVersaTrip Plus and MicroVersaTrip PM for Allis Chalmers, Siemens_Allis, and Siemens LA-600[F] and LA-1600[F] (Blue) - Manual (Page 16)

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secondary disconnect block through to the trip unit wiring
harness connector.
c. If the breaker’s lower studs connect to the power source,
then the neutral sensor must have its load end connected
to the source.
d. Verify that the neutral conductor is carrying only the
neutral current associated with the breaker’s load current
(the neutral is not shared with other loads).
5. If the preceding steps fail to identify the problem, then
measure the sensor resistances. The appropriate values are
listed in Table 1. Since the phase and neutral sensors are
electrically identical, their resistances should agree closely.
Breaker CT Rating, A Resistance,
LA-600
150
225
600 10.1–15.2
14.5–22
47–58
LA-1600
800
1600
54–81
110–166
Table 1. CT resistance values.