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Time Mark 257B 3-Phase Monitor, 3PH,208/240V
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Original price was: $111.10.$82.90Current price is: $82.90.
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3-Phase Monitor, 3PH,208/240V 60 Hz,SPDT, UL/CSA
- 3PH,208/240V 60 Hz,SPDT, UL/CSA
- Detects phase loss, low voltage, phase reversal
- 50Hz, 60Hz and 400Hz models
- Automatic or manual reset
- Five year unconditional warranty
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Description
Time Mark 257B 3-Phase Monitor
 | 3 Phase Power
|
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.
| Typical Application | Dimensions |
 |  |
Three Phase Monitor Relays | |
|---|---|
| 3-Phase Monitor Relay Function | Phase Loss/Phase Reversal/Under Voltage Only |
| Max Nominal Phase to Phase Voltage (monitors) | 240 VAC |
| Min Nominal Phase to Phase Voltage (monitors) | 208 VAC |
| Electrical Approval (monitor relays) | CSA, UL |
| Time Mark Mounting | 8-pin |
Product General Attributes | |
| Warranty | 5 YEARS |
| Warranty Details | This product is warranted to be free from defects in materials and workmanship, and is covered by our exclusive 5-year Unconditional Warranty. Should this device fail to operate for any reason, we will repair it for five years from the date of manufacture. |
| Safety Approval | CSA, UL |
| Product Weight | 0.475 LBS |
| Product Height | 3.52 IN |
| Product Length | 2.44 IN |
| Product Width | 1.75 IN |
| HTS/Schedule B Number | 8542.39.0001 |
| ECCN Number | EAR99 |
| Country of Origin | United States |
| UPC | 00662917001657 |
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Manuals/Guides
Spec Sheets
| Weight | 0.475 lbs |
|---|---|
| Dimensions | 2.44 × 1.75 × 3.52 in |
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Time Mark 257B 3-Phase Monitor... Original price was: $111.10.$82.90Current price is: $82.90.
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Contact Us Now:
📧 sales@nestesinstruments.com
📞 +1 (833) 763-7837
Let us assist you in finding the perfect solution!
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