Model A258B 3-Phase Monitor

Q: What are the operational temperature limits and output contact specifications for the A258B?

The A258B operates within a temperature range of -20¬∞ to +131¬∞ F. It features SPDT 10 amp output contacts at 240VAC resistive, with an expected mechanical relay life of 10 million operations.

A258B-480VAC

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 Pwr Mon

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a258b-480vac

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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

FAQs

What voltage systems can the Model A258B monitor?

The Model A258B is designed for 480VAC nominal phase-to-phase systems, with an adjustable monitoring range of 380-480VAC.

What protection features does the A258B offer for industrial equipment?

This monitor detects phase loss, low voltage conditions, and phase reversal, providing critical protection for 3-phase motors and sensitive equipment.

What are the operational temperature limits and output contact specifications for the A258B?

The A258B operates within a temperature range of -20° to +131° F. It features SPDT 10 amp output contacts at 240VAC resistive, with an expected mechanical relay life of 10 million operations.