3-Phase Monitor with Adjustable Trip & Restart Delays
The MODEL 20AA 3-Phase Monitor, SKU 20AA-LM, provides essential protection for industrial systems. It continuously monitors for critical conditions including phase loss, phase reversal, over/under voltage, and voltage unbalance, ensuring operational integrity. This device features adjustable trip delay times, configurable from 1 to 30 seconds, and restart delays, adjustable from 1 to 500 seconds. These settings allow for precise system integration and tailored response to power anomalies. The unit operates within a 95-120 VAC range and consumes 3.7W at 120V. It incorporates a manual reset function, requiring an external N.O. momentary pushbutton for re-engagement. Its 2x N.O. isolated output contacts, rated at 7.5A at 240VAC resistive, facilitate reliable control and system interaction. This monitor is designed for consistent performance in critical applications, contributing to minimized downtime through proactive fault detection.
Unv 3Ph Monitor
Specifications
| Model Type | Manual Reset |
|---|---|
| Manual Reset Requirement | External N.O. momentary pushbutton required for manual 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 |
