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.
| AUTO Reset MANUAL Reset | B257B | 257B | A257B | EX257B | B257B-400 | 257B-400 | |
| Nominal AC Voltage (phase to phase) | 120VAC | 208/240VAC | 480VAC | 380VAC | 120VAC | 208/240VAC | |
| Case Color | Gray | Red | Yellow | Yellow | Gray | Red | |
| Adjustment Range | 85-120VAC | 160-240VAC | 380-480VAC | 300-400VAC | 85-120VAC | 160-240VAC | |
| Frequency | 60 Hz | 60 Hz | 60 Hz | 50 Hz | 400 Hz | 400 Hz | |
| Power Consumption | 0.75W | 1.5W | 4.5W | 3.75W | 0.75W | 1.5W | |
| Transient Protection | 2500VRMS for 10 msec | ||||||
| Repeat Accuracy | ± 0.1% of set point | ||||||
| Response Time | 50 msec (set or reset) | ||||||
| Dead Band | Approximately 2% | ||||||
| Output Contacts | SPDT 10A at 240 VAC resistive | ||||||
| Expected Relay Life | Mech: 10 million operations | ||||||
| Operating Temp | - 40° to +131° F | ||||||
| Humidity Tolerance | 0 - 97% w/o condensation | ||||||
| Enclosure Material | Dust Cover: ABS Plastic | ||||||
| Mounting | 8-pin socket (**sold separately) | ||||||
| Weight | 5 oz. | ||||||
| Agency Approval | UL Recognized* and CSA Certified | ||||||
