Time Mark Corporation A258B-480V 3-Phase Monitor

Description:

The Time Mark Corporation A258B-480V 3-Phase Monitor is designed to continuously monitor 480 VAC three-phase power systems for phase loss, phase reversal, and undervoltage conditions to protect motors and critical industrial equipment. Commonly installed in motor control centers, HVAC systems, compressors, pumps, conveyors, and manufacturing machinery where reliable three-phase power protection is essential. Maintenance teams, OEMs, and system integrators use the A258B-480V for replacement, repair, retrofit, and preventive maintenance to reduce equipment damage and minimize unplanned downtime.

Applications:

The Time Mark A258B-480V is a solid-state three-phase monitoring relay that continuously supervises Wye or Delta power systems without requiring a neutral connection and de-energizes its output relay whenever phase loss, phase reversal, or undervoltage conditions are detected. It is widely used in industrial automation systems, motor control panels, water and wastewater facilities, HVAC equipment, compressors, conveyors, and process machinery where dependable three-phase power monitoring helps improve equipment reliability and protect valuable electrical assets.

Technical Specifications:

• Manufacturer: Time Mark Corporation
• Manufacturer Part Number (MPN): A258B-480V
• Product Type: 3-Phase Power Monitor Relay
• Series: 258 Series
• Nominal Voltage: 480 VAC (Phase-to-Phase)
• Frequency: 60 Hz (400 Hz model available)
• Monitoring Functions: Phase Loss, Phase Reversal, Undervoltage Protection
• Voltage Sensing: Adjustable Undervoltage
• Output Contacts: SPDT, 10 A at 240 VAC Resistive
• Mounting: 8-Pin Plug-In Socket
• Reset: Automatic
• Visual Indicators: TRIP and NORM LEDs
• Wye/Delta Compatible: Yes (No Neutral Required)
• Certifications: UL Recognized, CSA Certified
• Enclosure Material: ABS Plastic
• Application: Three-phase motor protection, HVAC equipment, pumps, compressors, conveyors, and industrial machinery.

Common Replacements:

• Time Mark A258BM-480V
• Time Mark B258B-480V
• Time Mark A263