Product Description
Description: Monitors • Current Monitor Relays • Function: 3-Phase/Current Unbalance • Input Voltage: 115 VAC • Input Voltage Range: 100-130 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 | 115 VAC |
| Input Voltage Range | 100-130 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 adjustable from 2% to 25% by adjusting a front panel control. An unbalance greater than this setting energizes the relay. The formula for an unbalance is: (MAX CURRENT - MIN CURRENT / MAX CURRENT) 100 = %. 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. A supply voltage of 24 or 120VAC is required for this unit. |
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