Model A258B 3-Phase Monitor
The Model A258B 3-Phase Monitor provides essential protection for industrial systems. This device monitors 480VAC nominal voltage, with an adjustable range of 380-480VAC, safeguarding against phase loss, low voltage, and phase reversal. Its AUTO Reset feature ensures continuous operation after fault conditions are resolved, minimizing downtime. With a rapid 50ms drop out response time, it quickly addresses anomalies to prevent equipment damage. The unit features SPDT 10 amp output contacts, rated for 10 million mechanical operations and 100,000 electrical operations at rated load, ensuring long-term reliability. Operating effectively across a -20° to +131° F temperature range and boasting UL Recognized and CSA Certified approvals, the A258B offers robust and dependable motor and system protection. Its compact design and 3.7W power consumption make it a practical choice for various industrial applications requiring consistent phase monitoring.
3Ph Pm Factory Set
Specifications
| Reset Type | AUTO Reset |
|---|---|
| Nominal AC voltage (phase to phase) | 480VAC |
| Case Color | Red |
| Adjustment range | 380-480VAC |
| Frequency | 60Hz |
| Power consumption | 3.7W |
| Protection Feature | Detects phase loss, low voltage, phase reversal |
| Warranty | Five year unconditional warranty |
| Transient protection | 2500VAC for 10ms |
| Repeat accuracy | ± 0.1% of set point (fixed conditions) |
| Response time | 50ms drop out |
| Dead band | Approx. 2% |
| Output contacts | SPDT 10 amps at 240VAC resistive |
| Expected relay life (Mechanical) | 10 million operations |
| Expected relay life (Electrical) | 100,000 operations at rated load |
| Operating temperature | -20° to +131° F |
| Humidity tolerance | 0-97% w/o condensation |
| Enclosure material | ABS plastic cover |
| Mounting | 8-pin socket (**sold separately) |
| Agency approvals | UL Recognized* and CSA Certified |
