The PA Series Phase Monitor Relays provide protection against phase loss, phase reversal & undervoltage in a compact plug-in design. These devices are designed to be compatible with most Wye or Delta systems. In Wye systems, a connection to a neutral is not required. Phase Monitor Relays protect against single phasing regardless of any regenerative voltages.

The relay is energized and the LED on when all three phase are present in the correct sequence at a voltage level above the undervoltage setting. The undervoltage drop-out can be set at 75-95% of operating voltage. Any fault will instantaneously de-energize the relay and turn off the LED. Re-energization is automatic upon correction of the fault condition.

• Protects against phase loss, phase reversal & undervoltage
• Undervoltage setting is adjustable from 75-95% of nominal
• LED indicates both normal and fault conditions
• Compact plug-in case utilizing industry-standard 8 pin octal socket
• 10A SPDT output contacts
• 

Application Data

Phase Loss:
Unit trips on loss of any Phase A, B or C.

Phase Reversal:
Unit trips if rotation (sequence) of the three phases is anything other than A-B-C.

Undervoltage:
Adjustable from 75-95% of nominal voltage. Unit trips when the average of all three lines is less than the adjusted set point for a period longer than the adjustable time delay drop-out.

Life:
Full Load: 100,000 operations

Response Times:
Operate: 50ms; Release: 50ms

Load (Burden):
3VA

Temperature:
-28o to 65o C (-20o to 150o F)

Transient Protection:
10,000 volts for 20 microseconds

Mounting:
Uses an 8 pin octal socket. Requires a 600V-rated socket when used on system voltages greater than 300V (Macromatic Product Number 70169-D).

Indicator LED:
Red LED on when all conditions are normal, and off when a fault condition has occurred.

Reset:
Automatic upon correction of fault

Approvals:

Dimensions