Product Description
Description: Phase Monitor Relays • Nominal AC Voltage: 208/240VAC • Case Color: Red • Adjustment range: 160-240VAC • Power consumption: 2.4W • Reset: Manual • Frequency: 400Hz • Output contacts : SPDT 10 amps at 240VAC resistive • Mounting : 8-pin socket ( **sold separately)
| Product Information | Resources |
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| Specifications |
| Product Attribute | Attribute Value |
| Nominal AC Voltage | 208/240VAC |
| Case Color | Red |
| Adjustment range | 160-240VAC |
| Power consumption | 2.4W |
| Reset | Manual |
| Frequency | 400Hz |
| Transient protection | 2500VAC for 10ms |
| Repeat accuracy | ± 0.1% of set point (fixed conditions) |
| Response time | 50ms drop out |
| Dead band | Approximately 2% |
| Output contacts | SPDT 10 amps at 240VAC resistive |
| Expected relay life | Mechanical: 10 million operations Electrical: 100,000 operations at rated load |
| Operating temp | -20° to +131° F |
| Humidity tolerance | 0 - 97% w/o condensation |
| Enclosure material | ABS plastic cover |
| Mounting | 8-pin socket ( **sold separately) |
| Weight | 5 ounces |
| Agency approvals | UL Recognized* and CSA Certified *Conditions of acceptability: (1) the 380V and 480V versions must be used with a UL Recognized 600VAC socket. (2) For use in a Pollution Degree 2 environment (3) To be installed on the load side of branch circuit protection rated 10A. |
| Series Features |
| MODEL 257 3-Phase Monitor |
| Series Description: The Model 257 continuously monitors 3-phase power lines for abnormal conditions. When properly adjusted, the Model 257 monitor will detect phase loss on a loaded motor even when regenerated voltage is present. This device consists of a solid-state voltage and phase-angle sensing circuit, driving an electromechanical relay. When correct voltage and phase rotation are applied, the internal relay will energize. A fault condition will de-energize the relay. When the fault is corrected, the monitor will automatically reset (a manual reset version is also available). The Model 257 does not require a neutral connection and can be used with Wye or Delta systems. Voltage ranges are sufficiently wide to allow for proper adjustment to existing conditions. Both TRIP and NORM condition indicators are provided to aid in adjustment and system trouble-shooting. |
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