Product Description
Description: Monitors • Current Monitor Relays • Function: 3-Phase/Current Unbalance • Input Voltage: 24 VAC • Input Voltage Range: 20-28 VAC • Power Consumption : 1.5W • VA Burden : 0.5VA per phase • Frequency Range : 50 - 400Hz • Current Range : 1 - 5 amps AC • Max. Input Current : 40 amps for 2 seconds • Contact Rating : SPDT 10A at 240VAC resistive • Enclosure Material : ABS plastic
| Product Information | Resources |
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| Specifications |
| Product Attribute | Attribute Value |
| Function | 3-Phase/Current Unbalance |
| Input Voltage | 24 VAC |
| Input Voltage Range | 20-28 VAC |
| Power Consumption | 1.5W |
| VA Burden | 0.5VA per phase |
| Frequency Range | 50 - 400Hz |
| Current Range | 1 - 5 amps AC |
| Max. Input Current | 40 amps for 2 seconds |
| Unbalance Adjustment | 2% to 25% |
| Trip Delay | 0.5 to 10 seconds ± 20% |
| Contact Rating | SPDT 10A at 240VAC resistive |
| Expected Relay Life | Mech: 10 million operations Elec: 100,000 at rated load |
| Transient Protection | 2500V for 10ms |
| Operating Temperature | - 20° to +131° F |
| Humidity Tolerance | 0-97% w/o condensation |
| Enclosure Material | ABS plastic |
| Weight | 1 lb. 1.5 oz. |
| Series Features |
| MODEL 272 3-Phase Current Unbalance Detector |
| Series Description: The Model 272 3-Phase Current Unbalance Detector monitors 3-phase lines to detect an unbalanced current. It can also monitor three separate single phase lines for equal current levels. The percentage of unbalance is adjusted from 2% to 25% by adjusting a front panel control. An unbalance greater than this setting energizes the relay. An adjustable trip delay of 0.5 to 10 seconds is also provided. For optimum performance, operating currents should be kept in the 1 to 5 amps range. However, zero current on each phase is considered to be a balanced condition. Continuous currents, up to 10 amps per phase, will not damage the unit, nor will current surges up to 40 amps for 2 seconds. The contacts are automatically reset when the unbalanced condition is corrected. |
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