GK Expertise is India’s leading manufacturing company for high-quality Numerical Protection Relays, specializing in 25kV and 2×25kV systems. Our advanced relays are widely trusted for their precision, reliability, and durability in Substations, Railway Traction Systems, Power Distribution, and Industrial Power Applications.
With years of engineering excellence and domain expertise, we design and supply robust protection relays that comply with national and international standards, ensuring seamless operation and system safety.
Explore the table below to learn more about our different types of relays, their functions, uses, and applications.
| Relay Name | Type | Uses | Applications | |
|---|---|---|---|---|
| AC DC Supervision Relay | Monitoring / Supervision Relay | Monitors presence and health of AC/DC auxiliary supply voltages | Control panels, substations, switchgear, battery banks | |
| Capacitor Bank Protection Relay | Protection Relay | Protects capacitor banks from overcurrent, unbalance, and faults | Power factor correction systems, substations, industrial capacitor installations | |
| Delta-I Protection Relay | Differential-Type Protection Relay | Detects internal faults via current difference (ΔI) | Busbars, switchgear panels, low-voltage systems | |
| Feeder Protection Relay | Multifunction Protection Relay | Protects feeders from faults using overcurrent, earth fault, or distance | Distribution & transmission feeders, substations | |
| OC/REF Protection Relay | Overcurrent and Earth Fault Relay | Protects circuits from overload and ground faults | Transformers, feeders, motors, LV/MV switchboards | |
| Panto Flashover Protection Relay | Fast Acting Fault Detection Relay | Detects pantograph flashovers during traction system operation | Railway electric locomotives, OHE (Overhead Equipment) systems | |
| Auto Transformer Protection Relay | Transformer Protection Relay | Protects auto transformers from internal and external faults | Railway substations, HV substations using auto transformers | |
| Transformer Differential Protection Relay | Differential Protection Relay | Detects internal transformer faults by comparing input/output currents | Power transformers in substations and power plants | |
