The M-0127A AC Current Relay guards against excessive circulating current using the circulationg current

method or the ∆VAR® 1 method. The M-0127A can be used in other current- and voltage-sensing

applications. Its adjustment range is 0.01 to 0.1 A.

• M–0127A intended for use in 0.2 A circulating current circuit of paralleled LTC transformers to guard

against damaging excessive circulating current

• M–0170A prevents damage to LTC transformer’s switching mechanism under excessive loads

• Available in:

• M–0127A: 0.01 to 0.1 Amps

• M–0170A: 0.2 to 0.4 Amps

• Both relays can be used in other current and voltage-sensing applications.

M‑0170A Application

The M‑0170A AC Current Relay is intended to be used in the load current circuit to prevent the

tapchanger from changing taps on excessive load current. Its range permits the current setting

from 100% to 200% of the rated full load current. The relay is connected in the same manner as the

M‑0127A.