


Product Overview: GWZC-9826 is a fast-acting (<30ms) transformer differential relay for 33kV–110kV systems, featuring harmonic restraint. Used in substations and industrial plants for transformer protection.
Product functions(ANSI):87H | 87 | 87A | 60
Communication functions: IEC61850 | IEC 60870-5-103 | MODBUS RTU |2× Ethernet Ports |2× RS-485
Product Overview : GWZC-9833 provides magnetic balance differential protection for HV motors, with overcurrent and thermal protection. Installed in motor control centers, it safeguards critical industrial motors with fault recording capability.
Product functions(ANSI):87M | 50 | 51 | 51 | 51 | 49 | 48 | 50Q | 46 | 46 | 50N/51N | 49 | 48 | 86 | 59 | 27 | 59N | 81O | 81U | 60FL | 27 | 74 | 27/81U | 30
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview : The GWZC-9862 Auto-Transfer Relay ensures uninterrupted power supply by automatically switching to backup sources in 35kV substations and industrial plants. It features voltage/current monitoring, programmable delays, and fault logging, with IEC 61850/Modbus support.
Product functions(ANSI):50/27 | 50/51 | 51 | 49 | 74
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview: GWZC-9852 PT Paralleling Relay ensures safe synchronization in 33kV/66kV systems through phase, frequency and voltage matching. Prevents out-of-phase closing with adjustable thresholds. Installed in switchgear and generator panels.
Product functions(ANSI):59 | 59N | 27/59
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview: The GWZC-9842 capacitor switching relay provides protection, control and monitoring for capacitor banks in 110kV and below systems, with installation in substations and industrial plants.
Product functions(ANSI):87H | 87 | 50/51 | 51 | 46 | 50N/51N | 59 | 27 | 47 | 74 | 74T | 30 | 25
Communication functions: IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview : GWZC-9832 Motor Differential Protection Relay for HV/LV motors (11kV-400V), detecting internal faults with CT supervision. Installed in MCCs and switchgear for fast fault clearance in industrial/power applications.
Product functions(ANSI):87H | 87 | 50 | 51 | 51 | 51V | 49 | 48 | 46 | 46 | 46V | 50N/51N | 49 | 48 | 86 | 59 | 27 | 59N | 81O | 81U | 60FL | 60 | 74 | 27/81U | 30
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview: The GWZC-9821C is a transformer differential relay that detects internal faults while preventing inrush false trips. Installed in substation panels, it provides reliable protection for power transformers in utility/industrial systems.
Product functions(ANSI):87H | 87 | 87AL | 50/51 | 51V | 49 | 46 | 46 | 50N/51N | 51N | 59 | 27 | 59N | 60FL | 60 | 60CT | 74 | 27D | 30
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview : GWZC-9890L Underfrequency/Undervoltage Load Shedding (UFUVLS) device is a grid protection system that automatically cuts loads to maintain stability during frequency drops or voltage dips, preventing blackouts in renewable-rich power networks.
Product functions(ANSI):27L1, 27L2, 27L3 | 59L1, 59L2, 59L3 | 81L1, 81L2, 81L3 | 81O1, 81O2, 81O3
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview : The GWZC-9811C line differential protection relay is specifically designed for power distribution systems up to 66kV, featuring pilot-wire differential protection technology for fast fault clearance.
Product functions(ANSI):87H | 87 | 87A | 50 | 51 | 51V | 49 | 46 | 50N/50G | 59 | 27 | 81 | 30
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485
Product Overview : GWZC-9871 Bus Tie Protection and Control Relay is designed for bus charging protection or bus tie protection and monitoring & control in power systems with voltage levels up to 110kV.
Product functions(ANSI):51V | 50N/51N | 27/59 | IEC 61850: XCBR.Alm
Communication functions : IEC61850 | IEC 60870-5-103 | MODBUS RTU | 2× Ethernet Ports | 2× RS-485