B258BM-120VAC
The Model B258BM-400 3-Phase Monitor provides critical oversight for industrial electrical systems. Designed for 120VAC nominal applications, it offers an adjustable monitoring range of 85-120VAC, ensuring precise voltage control. This monitor actively detects detrimental conditions including phase loss, low voltage, and phase reversal, thereby preventing potential equipment damage and operational downtime. Operating at 400Hz, its 50ms drop out response time facilitates rapid system protection. The unit features durable SPDT 10 amp output contacts, capable of managing significant loads. Its operational integrity is maintained across a wide temperature spectrum, from -20° to +131° F, and it tolerates 0-97% humidity without condensation. This robust construction, coupled with a five-year unconditional warranty, ensures sustained performance and reliability in demanding environments.
The Model 258 continuously monitors 3-phase power lines for abnormal
conditions. When properly adjusted, the Model 258 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 258 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.
Out of stock
Specifications
| Reset Type | MANUAL Reset |
|---|---|
| Nominal AC voltage (phase to phase) | 120VAC |
| Case Color | Gray |
| Adjustment range | 85-120VAC |
| Frequency | 400Hz |
| Power consumption | 1.4W |
| 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 |
