20AA-L
The 20AA-L 3-Phase Monitor provides essential protection for industrial equipment by continuously monitoring critical electrical parameters. This unit detects phase loss, phase reversal, over/under voltage, and voltage unbalance, safeguarding connected machinery from potential damage. Its auto-reset functionality minimizes operational interruptions, while clear LED indicators provide immediate status feedback. Operators can precisely adjust trip delay times within a 1 to 30-second range and configure restart delays from 1 to 500 seconds. This granular control allows for tailored system integration, accommodating specific process requirements and preventing nuisance tripping. The monitor's robust design, coupled with its comprehensive monitoring capabilities, contributes to enhanced system reliability and extended equipment lifespan. A 5-year unconditional warranty underscores its dependable performance in demanding industrial environments.
The Model 20AA is a microcontroller-based universal 3-phase monitor for
protecting 3-phase motors from abnormal power conditions. It can detect
under voltage, over voltage, voltage unbalance, reverse phase, and
single-phasing even when regenerated voltage is present. The Model 20AA
includes adjustable trip and restart delays to prevent nuisance tripping
during power fluctuations and short cycling in compressor applications.
The LED status indicators and adjustment pots for Voltage Adjustment, %
Unbalance, Restart Delay and Trip Delay are mounted on the front of the
unit for easy access. The 20AA has 2 normally open (N.O.) isolated
contacts.Automatic or manual restart versions are available. The Model
20AA does not require a neutral connection and can be used on either Wye
or Delta systems. All versions of the Model 20AA are UL Recognized
(U.S. and Canada) and are available with optional gold flashed silver
contacts for low current applications.
Out of stock
Specifications
| Model Type | Auto Reset |
|---|---|
| Monitored Conditions | Phase Loss, Phase Reversal, Over/Under Voltage and Voltage Unbalance |
| Indicators | LED Status Indicators |
| Operating Voltage | 95-120 VAC |
| Power Consumption | 3.7W at 120V |
| Auto Ranges | No |
| 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 |
| Voltage Unbalance Conformance | 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 | 1-500 sec., adjustable |
| Manual Reset Input | 5V open circuit/500µA short circuit |
| Output Contacts | 2x N.O. (Isolated) |
| Output Contact Rating | 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 |
| Dimension Tolerance | ±0.06 |
| Optional Feature | /SG = Silver with Gold Flash Contacts |
| Warranty | 5-year Unconditional Warranty |
