Time Mark Corporation A258B-480VAC 3-Phase Monitor

Description:

The Time Mark Corporation A258B-480VAC 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 other critical electrical equipment. Commonly installed in industrial motor control panels, HVAC systems, compressors, pumps, conveyors, and manufacturing equipment where dependable three-phase power monitoring is essential. Maintenance technicians, OEMs, and system integrators use the A258B-480VAC for replacement, repair, retrofit, and preventive maintenance to reduce equipment damage and minimize unplanned downtime.

Applications:

The Time Mark Corporation A258B-480VAC is a solid-state three-phase monitor that continuously supervises incoming three-phase power and de-energizes its output relay whenever phase loss, phase reversal, or undervoltage conditions are detected. It is widely used in industrial motor controls, water and wastewater facilities, HVAC equipment, compressors, conveyor systems, and process automation applications requiring reliable protection against abnormal three-phase power conditions.

Technical Specifications:

• Manufacturer: Time Mark Corporation
• Manufacturer Part Number (MPN): A258B-480VAC
• Product Type: 3-Phase Monitor
• Nominal Voltage: 480 VAC (Phase-to-Phase)
• Voltage Adjustment Range: 380–480 VAC
• Frequency: 60 Hz
• Power Consumption: 3.7 W
• Phase Sensing: Phase Loss and Phase Reversal
• Voltage Protection: Undervoltage Monitoring
• Output Contacts: SPDT, 10 A at 240 VAC Resistive
• Mounting: 8-Pin Socket Mount
• Automatic Reset: Yes
• Operating Temperature: -20°F to +131°F (-29°C to +55°C)
• Enclosure Material: ABS Plastic
• Certifications: UL Recognized, CSA Certified
• Application: Three-phase motor protection, compressors, pumps, HVAC equipment, and industrial control systems.

Common Replacements:

• Time Mark A258BM-480VAC
• Time Mark 2581-480
• Time Mark B258B-480VAC