Time Mark Corporation 272-120VAC Current Sensor

Description:

The Time Mark Corporation 272-120 Sensor is designed to detect current unbalance across three-phase power systems operating from a 120 VAC supply, helping protect motors and electrical equipment from damaging current imbalance conditions. Commonly installed in motor control centers, pump stations, compressors, conveyors, and industrial process equipment where accurate three-phase current monitoring is essential for reliable operation. Maintenance teams, OEMs, and system integrators use the 272-120 for replacement, repair, retrofit, and preventive maintenance to improve system reliability and minimize unexpected equipment failures.

Applications:

The Time Mark 272-120 is a solid-state three-phase current unbalance detector that continuously monitors current levels on three-phase circuits or three individual single-phase lines and energizes its output relay when an adjustable unbalance threshold is exceeded. It is widely used in industrial automation systems, HVAC equipment, compressors, pumps, conveyors, and manufacturing machinery where early detection of current imbalance helps prevent motor damage, reduce downtime, and improve overall system protection.

Technical Specifications:

• Manufacturer: Time Mark Corporation
• Manufacturer Part Number (MPN): 272-120
• Product Type: 3-Phase Current Unbalance Detector
• Supply Voltage: 115 VAC Nominal (100–130 VAC Operating Range)
• Frequency: 50–400 Hz
• Current Range: 1–5 A AC
• Maximum Input Current: 10 A Continuous, 40 A for 2 Seconds
• Unbalance Adjustment: 2%–25% Adjustable
• Trip Delay: Adjustable 0.5–10 Seconds (±20%)
• Output Contacts: SPDT, 10 A at 240 VAC Resistive
• Reset Type: Automatic
• Mounting: Surface Mount
• Enclosure Material: ABS Plastic
• Operating Temperature: -20°F to +131°F (-29°C to +55°C)
• Weight: 1 lb. 1.5 oz. (0.50 kg)
• Application: Three-phase motor protection, current imbalance detection, and industrial equipment monitoring.

Common Replacements:

• Time Mark 272-24
• Time Mark 2722
• Time Mark 274-5-120-A