- Catalog Number: MARKA257B
- Color: Yellow
- Contact Configuration: SPDT
- Dimensions: 3.52 x 1.75 x 2.44 in
- Mounting Type: Socket
- Number of Pins: 8
- Series: 257
- Terminal: Pin
- Type: 3-Phase Monitor Relay
- UPC 11: 99587800257
- UPC 12: 99587800257
- Stock Status: NORMALLY STOCKED
- Amperage Rating: 10 A
- Frequency Rating: 60 Hz
- Voltage Rating: 480 VAC
Solid state relay with 3-Phase monitor, yellow in color, socket mount. It has frequency of 60 hz, rated at 240 VAC and 10 A current rating.
- Features
| 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. |