Time Mark Corporation 2501-120 Three-Phase Power Monitor

Description:

The Time Mark Corporation 2501-120 3-Phase Power Monitor is designed to continuously monitor 120 VAC three-phase power systems for phase loss, phase reversal, undervoltage, and voltage unbalance to protect motors and industrial equipment. Commonly installed in motor control centers, HVAC systems, pumps, compressors, conveyors, and manufacturing equipment where dependable three-phase power monitoring is essential. Maintenance teams, OEMs, and system integrators use the 2501-120 for replacement, repair, retrofit, and preventive maintenance to minimize equipment damage and reduce unplanned downtime.

Applications:

The Time Mark Corporation 2501-120 is a solid-state three-phase power monitor that continuously supervises three-phase WYE or DELTA power systems without requiring a neutral connection and de-energizes its output relay when phase loss, phase reversal, undervoltage, or voltage unbalance conditions are detected. It is widely used in industrial automation systems, water and wastewater facilities, motor control panels, compressors, conveyors, HVAC equipment, and process machinery where reliable three-phase power monitoring helps prevent costly equipment failures and production interruptions.

Technical Specifications:

• Manufacturer: Time Mark Corporation
• Manufacturer Part Number (MPN): 2501-120
• Product Type: 3-Phase Power Monitor
• Nominal Voltage: 120 VAC
• Voltage Adjustment Range: 84–114 VAC
• Frequency: 50/60 Hz
• Voltage Unbalance Adjustment: 2–10% (per NEMA specifications)
• Trip Delay: Adjustable 1–10 Seconds
• Power Consumption: 4.5 W per Phase
• Output Contacts: SPDT, 30 A at 28 VDC/300 VAC, 5 A at 480/600 VAC (0.75 PF)
• Reset Type: Automatic
• Repeat Accuracy: ±1% Full Scale
• Reset Time: 150 ms Nominal
• Dead Band: 2% of Full Scale
• Mounting: Surface Mount
• Enclosure Material: ABS Plastic
• Operating Temperature: -4°F to +131°F (-20°C to +55°C)
• Certifications: UL Listed to U.S. and Canadian Safety Standards
• Application: Three-phase motor, compressor, pump, HVAC, conveyor, and industrial equipment protection.

Common Replacements:

• Time Mark 2501D-120
• Time Mark 257B
• Time Mark 258B