3-Phase Monitor with Adjustable Trip & Restart Delays

20AB-HM/SG

The Model 20AB 3-Phase Monitor, SKU 20AB-HM, provides essential protection for industrial systems. It monitors phase loss, phase reversal, over/under voltage, and voltage unbalance, ensuring comprehensive system oversight. Users can adjust trip delays from 1 to 30 seconds for over, under, and unbalanced voltage conditions, allowing for tailored response times to specific operational needs. A manual reset feature ensures controlled system restarts following a fault. Operating across 475-600 VAC with a power consumption of 4.5W at 600V, this unit offers reliable performance in demanding environments. Its robust design includes a Noryl plastic enclosure and flexible DIN rail or surface mounting options. The monitor's precise RMS measurement type contributes to accurate fault detection, minimizing downtime and protecting valuable equipment from electrical anomalies.

Unv 3Ph Monitor

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Specifications

Reset Type	Manual Reset
Operating Voltage	475-600 VAC
Power Consumption	4.5W at 600V
Auto Ranges	No
Monitored Conditions	Phase Loss, Phase Reversal, Over/Under Voltage and Voltage Unbalance
Frequency	50/60Hz
Type of Measurement	RMS
Under Voltage Trip	90% ±1% (% of setpoint)
Under Voltage Reset	93% ±1% (% of setpoint)
Over Voltage Trip	110% ±1% (% of setpoint)
Over Voltage Reset	107% ±1% (% of setpoint)
Voltage Unbalance Trip	2-8%, adjustable (conforms to NEMA)
Voltage Unbalance Reset	Trip setting minus 0.7%
Trip Delay Time (Over, Under, & Unbalanced)	1-30 sec., adjustable
Trip Delay Time (Single-Phasing Faults)	1 sec., fixed
Trip Delay Time (Unbalance > 15%)	1 sec., fixed
Restart Delay	Disabled in manual reset mode
Manual Reset Input	5V open circuit/500µA short circuit
Manual Reset Requirement	External N.O. momentary pushbutton required for manual reset
Output Contacts	1x N.C., 1x N.O. 7.5A at 240VAC resistive
Operating Temperature	-20° to +140° F
Humidity Tolerance	0-97% w/o condensation
Terminal Torque	3.5 in. lbs. maximum
Wire Type	Stranded or solid 14-26 AWG, 1/terminal
Enclosure Material	Noryl plastic
Mounting	DIN Rail or Surface Mount
Additional Options	/SG = Silver with Gold Flash Contacts
Warranty	5-year Unconditional Warranty

FAQs

What is the reset mechanism for the 20AB-HM 3-Phase Monitor?

The 20AB-HM features a Manual Reset type. An external normally open momentary pushbutton is required for manual reset operation.

What voltage conditions does the 20AB-HM monitor?

The 20AB-HM monitors phase loss, phase reversal, over/under voltage, and voltage unbalance conditions within an operating voltage range of 475-600 VAC.

Can the trip delay times be adjusted on this monitor?

Yes, the trip delay time for over, under, and unbalanced voltage conditions is adjustable from 1 to 30 seconds. Single-phasing faults and unbalance greater than 15% have a fixed 1-second delay.