The GC-200 Ground-fault relay system protects a grounded distribution system from low level arcing ground faults. The system includes the GC-200 relay, a sensor (current transformer), and optional GC DSP display, and is used with a bolted pressure switch or circuit breaker to open a circuit upon detection of a ground fault.

GC-200 Relay Features

• Five models with sensitivities suitable for main, feeder, or branch circuits
• Ten adjustable pickup settings for each model
• Small, non-metallic enclosure mounts on DIN rail
• 10 A and 5 A output contacts for trip and alarm
• Zone-selective interlocking (ZSI) to optimize coordinated systems
• I²t inverse time characteristics

GC DSP Display (Optional)

• Real-time display of ground-fault values
• Recalls ground-fault at last trip or at maximum since reset
• Allows remote testing or resetting of the relay for flexibility
• LCD back-lit display for easy reading
• Surface mounts over panel meter cutout
• Fine adjust pickup settings

Sensors

• Zero sequence sensing current transformer for all phases and neutral
• Several sizes of toroids and rectangular CTs
• Many are split-core or open frame for ease of installation