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Flexible hardware configurations
Customize binary inputs and outputs within the 1/3 base module. Choose between large or small displays for optimal viewing. The modular design adapts to your operational requirements.
Why SIPROTEC 7SJ81?
The SIPROTEC 7SJ81 is an overcurrent protection device designed for feeders and lines in medium-voltage systems. It ensures safety and high availability for your electrical equipment with powerful protection functions that work even under extreme environmental conditions. This device provides a compact, cost-effective overcurrent protection solution with a user-friendly design for easy handling.
SIPROTEC 7SJ81
Reduce costs on overcurrent protection
Enjoy low-cost overcurrent protection for feeders and lines in medium-voltage systems. The compact design provides essential protection without unnecessary complexity.
Enhance operational safety
Rely on powerful protection functions for safety in your electrical equipment. Conformal coating of electronic boards provide high availability even in extreme environmental conditions.
Simplify device management
Handle devices and software easily with a user-friendly design. Rely on cybersecurity measures like logging security-related events to protect your systems.
Featured capabilities
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Overcurrent protection functions
Detects any ground faults in compensated/isolated power systems using: 3I0>, V0>, transient ground fault, cos φ, sin φ, dir. intermittent ground fault, harmonic detection, and admittance measurement.
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Advanced communication and cybersecurity
Arc fault protection is a technique employed for the fast clearance of arcing faults on busbars and within metal clad switchgear and associated cable boxes.
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Cybersecurity
Extensive cybersecurity functionality, such as role-based access control (RBAC), protocolling security-related events, signed firmware or authenticated network access IEEE 802.1X.