Control & Relay Panels are critical protection and switching modules within a substation system, designed to monitor, control, and safeguard high voltage electrical equipment including transformers, feeders, bus bars, and transmission lines. These panels house numerical or microprocessor-based protective relays, control switches, indication lamps, annunciators, meters, terminal blocks, and auxiliary relays ? all integrated within a robust sheet steel enclosure conforming to IP42 or higher protection ratings. The protection relays continuously monitor electrical parameters such as current, voltage, frequency, and power factor, automatically triggering circuit breaker tripping signals upon detection of faults including overcurrent, earth fault, differential, distance, and under-voltage conditions. Equipped with SCADA and RTU interfacing capabilities through RS485 or IEC 61850 communication protocols, these panels enable real-time remote monitoring and event logging. Control & Relay Panels are designed and tested in accordance with IEC 60255 and IEC 61850 standards, ensuring high reliability, selectivity, and fast fault clearance. Widely deployed across 11 kV to 220 kV substations in power utilities, industrial plants, and renewable energy installations, they form the operational nerve centre of any substation protection and automation system