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.

Additional Applications

The M‑0127A and M‑0170A can be used wherever an adjustable, low burden AC relay is required. They

have virtually no time delay, a very small hysteresis and a normally closed output for use on AC only. The

relay output draws approximately 6 mA of in‑phase current through a 120 Vac load when open. These factors

must be considered for the user’s specific application.

By adding external series resistors, the relays may be used for voltage sensing. For example, with a 10 K

series resistor, the M‑0127A is adjustable from 100 to 140 Vac, using 10 to 14 mA current setting range.

Use of a 10 K, 10 W wire‑wound resistor is suggested.