JVR1000-AN voltage phase-sequence protection for 3-phase four-wire systems (115-277 VAC). Provides comprehensive monitoring and protection for overvoltage, undervoltage, voltage imbalance, phase faults, phase loss, and neutral disconnection with adjustable protection thresholds for electrical safety. Intuitive LCD display shows real-time voltages, fault status, and configuration parameters, enabling simple monitoring and quick issue detection before damage occurs to valuable equipment. Flexible configuration options include adjustable ranges for overvoltage and undervoltage (80-330 V), voltage imbalance (1-50%), and action delay (0.1-999 s), with auto and manual reset modes to fit specific applications. Easy installation and integration with standard 35 mm DIN-rail mounting. Compact footprint (80 x 43 x 54 mm) and two output contacts (one SPDT/changeover and one normally closed) rated at 6 A 250 VAC for seamless integration into existing control systems. 2-3 practical use scenarios: - Control panels powering motors and PLCs in manufacturing lines to prevent damage from voltage irregularities. - Protection of HVAC or process automation equipment where stable 3-phase power is critical. - Guarding 3-phase gear in data centers or server racks against voltage faults and neutral outages.