Siemens SIPROTEC 7SJ81 Feeder Protection Relay.

The SIPROTEC 7SJ81 Compact Directional Feeder Protection Relay from Siemens is designed for reliable overcurrent and feeder protection in industrial plants, substations, and utility networks. Featuring 4xI/0–3xV inputs and low-power CT compatibility, this compact relay ensures precise directional fault detection and enhanced system safety.

Engineered for modern power distribution requirements, the SIPROTEC 7SJ81 offers Siemens-certified reliability, advanced protection functions, and easy integration into existing systems. Whether you need feeder protection for substations or overcurrent protection in industrial applications, this relay delivers high performance and flexibility.

Available through trusted suppliers in Mumbai, the SIPROTEC 7SJ81 relay combines technical excellence, fast delivery, and competitive pricing, making it the ideal choice for engineers, utilities, and industries seeking dependable protection solutions.

The following low-power current transformer ratios are suitable for the following primary current operating ranges:

• 100 A/225 mV for a primary operating current range of 40 A … 600 A
• 50 A/22.5 mV for a primary operating current range of 200 A … 3000 A
• 400 A/225 mV for a primary operating current range of 200 A … 2500 A
• 100 A/22.5 mV for a primary operating current range of 400 A … 5000 A