Product Description
Description: Phase Monitor Relays • Operating Voltage: 95-120 VAC • Power Consumption: 3.7W at 120V • Auto Ranges: No • Reset: Manual • Frequency: 50/60Hz • Type of Measurement : RMS • Under Voltage Trip Reset : (% of setpoint) 90% ±1% 93% ±1% • Over Voltage Trip Reset : (% of setpoint) 110% ±1% 107% ±1% • Voltage Unbalance Trip Reset : (conforms to NEMA) 2-8%, adjustable Trip setting minus 0.7% • Output Contacts : SPDT 10A at 240VAC resistive • Mounting : 8-Pin Socket (**sold separately)
| Product Information | Resources |
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| Specifications |
| Product Attribute | Attribute Value |
| Operating Voltage | 95-120 VAC |
| Power Consumption | 3.7W at 120V |
| Auto Ranges | No |
| Reset | Manual |
| Frequency | 50/60Hz |
| Type of Measurement | RMS |
| Under Voltage Trip Reset | (% of setpoint) 90% ±1% 93% ±1% |
| Over Voltage Trip Reset | (% of setpoint) 110% ±1% 107% ±1% |
| Voltage Unbalance Trip Reset | (conforms to NEMA) 2-8%, adjustable Trip setting minus 0.7% |
| Trip Delay Time Over, Under, & Unbalanced Single-Phasing Faults Unbalance > 15% | 1-30 sec., adjustable 1 sec., fixed 1 sec., fixed |
| Restart Delay | 1-500 sec., adjustable |
| Manual Reset Input | 5V open circuit/500?A short circuit |
| Output Contacts | SPDT 10A at 240VAC resistive |
| Operating Temp | - 20o to +140o F |
| Humidity Tolerance | 0-97% w/o condensation |
| Enclosure | Noryl plastic |
| Mounting | 8-Pin Socket (**sold separately) |
| Weight | 9.5 oz. |
| Low Current Options | Models ordered with suffix /SG have silver with gold flash contacts |
| Agency Approval | UL Recognized (U.S. and Canada) (For use in a Pollution Degree 2 Environment) |
| Series Features |
| MODEL 21 3-Phase Monitor with Adjustable Trip & Restart Delays |
| Series Description: The Model 21 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 21 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. Automatic or manual restart versions are available. The Model 21 does not require a neutral connection and can be used on either Wye or Delta systems. All versions of the Model 21 are UL Recognized (U.S. and Canada) and are available with optional gold flashed silver contacts for low current applications. |
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