GE 12SGC21B4A Rev B Static Negative Phase Sequence

GE 12SGC21B4A Rev B Static Negative Phase Sequence Time Overcurrent Relay – Model Overview and Application Guide

🔧 Product Description
The GE 12SGC21B4A Rev B is a static negative phase sequence time overcurrent relay designed for precise protection of electrical power systems. It operates on a 5A nominal current rating, tailored for phase imbalance and asymmetry detection. This relay functions by monitoring the negative sequence component of the current, which appears during phase unbalance or fault conditions. It triggers a time-delayed trip to disconnect the faulted section, thus preventing equipment damage and maintaining system stability. Its construction is based on reliable solid-state circuitry, which ensures dependable performance and long operational life with minimal maintenance requirements.

GE 12SGC21B4A Rev B Static Negative Phase Sequence Time Overcurrent Relay 5A

📐 Technical Specifications
This relay is part of GE’s SGC protection relay series, specifically optimized for negative sequence overcurrent applications. It has a nominal current input of 5 amperes and operates within a typical frequency range of 50/60 Hz. The relay incorporates a time-delay feature based on inverse-time characteristics, allowing flexibility for coordination with other protective devices. The device supports adjustable settings to fine-tune both the pickup level and time delay, ensuring compatibility across various system designs. Its static design means no moving parts, reducing mechanical wear and improving long-term reliability. The enclosure is suitable for panel mounting and includes terminals for secure wiring in control cabinets.

⚙️ Applications and Features
The GE 12SGC21B4A Rev B is most often used in utility substations, industrial motor protection systems, and generators where phase imbalance must be identified quickly. It protects against faults caused by phase loss, open conductors, and unbalanced loading, which can lead to overheating and reduced efficiency in motors and transformers. It is particularly effective in medium-voltage switchgear and can be integrated into relay panels or automated protection schemes. Other features include LED status indicators, test jacks for calibration and commissioning, and a rugged design that withstands harsh electrical and environmental conditions. Its modular construction supports field servicing and quick replacement without disturbing other equipment.

🔗 Useful Links
For more product details or to explore purchase options:
👉 https://www.fy-module.com/
👉 Visit Our Industrial Automation Catalog

📊 Recommended Similar Models

Model Number Description Current Rating Application Type
GE 12SGC21B1A Static Negative Phase Sequence Relay 1A Generator protection
GE 12SGC21B2A Time Overcurrent Relay with NPS Detection 2A Transformer and feeder protection
GE 12SGC21B3A Static Relay with Adjustable Trip Settings 3A Industrial motor applications
GE 12SGC21B4A Static NPS Overcurrent Relay (This Model) 5A General phase unbalance protection
GE 12SGC21B5A Extended Delay NPS Overcurrent with Logic Interface 5A Large-scale power distribution

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