Time Mark Corp. 3-Phase Monitor B258B-120VAC

Description:

The Time Mark Corporation B258B-120VAC 3-Phase Monitor is designed to continuously monitor 120 VAC three-phase power systems for phase loss, phase reversal, and undervoltage conditions to help protect motors and other critical equipment. Commonly installed in HVAC systems, pump stations, compressors, industrial motor control panels, and manufacturing equipment where dependable three-phase power monitoring is essential. Maintenance technicians, OEMs, and system integrators use the B258B-120VAC for replacement, repair, retrofit, and preventive maintenance to reduce equipment damage and minimize unplanned downtime.

Applications:

The Time Mark Corporation B258B-120VAC is a solid-state three-phase monitor that supervises incoming three-phase power and de-energizes its output relay when phase loss, phase reversal, or undervoltage conditions are detected. It is widely used in water and wastewater facilities, HVAC equipment, conveyor systems, industrial pump controls, compressors, and process automation applications where continuous monitoring of three-phase electrical power is required.

Technical Specifications:

• Manufacturer: Time Mark Corporation
• Manufacturer Part Number (MPN): B258B-120VAC
• Product Type: 3-Phase Monitor
• Nominal Voltage: 120 VAC (Phase-to-Phase)
• Voltage Adjustment Range: 85–120 VAC
• Frequency: 60 Hz
• 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
• Power Consumption: 1.4 W
• 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 B258BM
• Time Mark 252B
• Time Mark A258B