The Model 102A is an auto-ranging voltage monitor designed to protect
3-phase motors regardless of size. It is used on 190-480 VAC; 50 to 60
Hz motors to prevent damage caused by single phasing; low voltage;
phase reversal; or voltage unbalance.
This unique microcontroller-based voltage and phase-sensing circuit
constantly monitors the three-phase voltages to detect harmful power
line conditions. When a harmful condition is detected; the MotorSaver’s
output relay is deactivated after a specified trip delay. The output relay
reactivates after power line conditions return to an acceptable level for a
specified amount of time (Restart Delay). The trip delay prevents
nuisance tripping due to rapidly fluctuating power line conditions.

Protects 3-Phase
Motors from:
•Loss of Any Phase
(Single Phasing)
•Low Voltage
•Voltage Unbalance
•Phase Reversal
Additional Features:
•UL and cUL listed
•5-Year Warranty
•Made in USA
•Optional Manual/2-300 sec.
Variable Restart Delay
•Surface Mount with
•Optional DIN Rail Mount
•Optional High Voltage Trip
•LED Diagnostics:
High or Low Voltage;
Unbalance; Single-phase
or Reverse-phase Trips
•Finger-safe Barrier Strip Cover

Universal range from
190-480 VAC; 50/60 Hz;
provides the versatility
needed to handle global
applications.
Bicolor LED indicator
light is green in normal
conditions and red during trip conditions.
Compact design saves
precious panel space.
Microcontroller-based
design provides better
accuracy and higher
reliability than
analog designs.
Transient protected to
meet IEEE 587
standards and stand
up under tougher
conditions.
10A @ 240 VAC general
purpose relay can switch
most loads.
Detects single-phase
condition regardless of
regenerated voltages.

3-Phase Overload Relay/200-480V/2-800FLA/Plus (replaces 777; 777-P; 777-P1)

DeviceNet CIO Module for 777-P2/ 4 digital inputs; 2 outputs