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GWZC-9826 Main Transformer Differential Protection Relay
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GWZC-9826 Main Transformer Differential Protection Relay(87H | 87 | 87A)

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

GWZC-9833 Motor Magnetic Balance Differential Protection Relay
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GWZC-9833 Motor Magnetic Balance Differential Protection Relay (87M)

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

GWZC-9862 Incoming Line Auto-transfer Relay
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GWZC-9862 Incoming Line Auto-transfer Relay (50/27)

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

GWZC-9852 PT synchronizing relay
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GWZC-9852 PT Paralleling relay

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

GWZC-9842 Capacitor switching relay
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GWZC-9842 Capacitor switching relay

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

GWZC-9832 Motor Differential Protection Relay GWZC-983
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GWZC-9832 Motor Differential Protection Relay (87M)

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

GWZC-9821C Transformer Differential Protection Relay
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GWZC-9821C Transformer Differential Protection Relay (87H | 87 | 87AL)

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

GWZC-9890L Low-Frequency Low-Voltage Load Shedding DeviceGWZC-9890L Low-Frequency Low-Voltage Load Shedding Device
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GWZC-9890L Low-Frequency Low-Voltage Load Shedding Device

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

GWZC-9811C Line differential protection relay
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GWZC-9811C Line differential protection relay (87H | 87)

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

GWZC-9871 Bus Tie Protection & Control Relay
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GWZC-9871 Bus Tie Protection & Control Relay

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

Technical Knowledge More
Wireless Temperature Monitoring System for Substations
Wireless Temperature Monitoring System: Application in Switchgear​
This article introduces the application of wireless temperature monitoring systems in high-voltage and low-voltage switchgear. The configuration of the wireless temperature monitoring system varies across different equipment. If you need a customized wireless temperature monitoring solution for your project, please visit our website for more information.
2025/09/08
GWZC-9804 Arc Flash Protection Relay
Switchgear Arc Flash Protection System Configuration Scheme
This article introduces the configuration scheme for a switchgear arc flash protection system. Busbar arc flash protection monitors the busbar compartment and trips the incoming breaker, while feeder arc flash protection monitors the circuit breaker compartment and cable compartment to trip the feeder breaker. A proper arc flash protection system configuration scheme can effectively protect personnel and equipment safety. For information on a reliable arc flash protection system configuration scheme, please visit our website.
2025/09/04
Arc Flash Protection Relay
Arc Protection Working Principle and Decision Process
Arc Flash Protection is a specialized safety system engineered to rapidly detect and mitigate destructive electrical arc flash faults. Unlike conventional overcurrent protection, it utilizes a combination of light and current sensors to identify an arc flash event within milliseconds. By triggering a circuit breaker to isolate the fault incredibly fast, Arc Flash Protection significantly reduces the explosive energy released, safeguarding personnel from severe injury and preventing extensive damage to electrical equipment like switchgear. This makes it an indispensable defense layer in industrial, commercial, and utility power systems.
2025/09/03
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