Additional information
| Automatic Reset | |
|---|---|
| Certifications | |
| Contacts | SPDT |
| Manual Reset | Yes |
| Mount | 8-Pin |
| Phase Sensing | |
| Trip Delay | |
| Trip Restart | No |
| Voltage Sensing | |
| Voltage Range |
A257BM
Categories: 257-Series, 3-Phase-MonitorsThe 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.
Time Mark products are only sold through authorized Time Mark distributors. The “Buy Online” button will open a new browser window on Octopart.com and display Time Mark distributors that sell your desired product.
If Octopart does not currently display the Time Mark product you desire, please call us Toll-Free at (800) 862-2875 or use the Find a Distributor link on our website to find a distributor near you.
If Octopart does not currently display the Time Mark product you desire, please call us Toll-Free at (800) 862-2875 or use the Find a Distributor link on our website to find a distributor near you.
