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G59/3 Relay Enclosures

These G59 Relay Enclosures are configured to meet your Current/Power requirements for a grid-connected, embedded generation system (SSEG) providing in excess of 16A per phase. 

Assembled by our strategic manufacturing partner, these units are designed to protect against:

  • AC voltage change
  • Frequency change
  • Vector shift / ROCOF

Each G59 relay enclosure is fitted with an internally mounted G59 relay complete with LCD display screen, manual reset button, last trip record and sealable locking facility.  Each panel can be supplied with a door-interlocked (padlockable) isolator switch for additional user protection that enables the user to manually disconnect the embedded generator.  Additional items can also be integrated into the enclosures such as SPDs (surge protection), kWh metering (door mounted) and specific circuit-protective devices for the inverter output feeds (MCBs, RCBOs etc).

The G59 relay (ComAp MainsPro) is of the programmable type with functions relating to:

  • Under & over-voltage 230v single-phase or 400v three-phase (ANSI 27/59)
  • Under & over-frequency 50Hz (ANSI 81L/H)
  • Vector shift (ANSI 78)
  • ROCOF (ANSI 81R)
  • Voltage asymmetry (ANSI 47)
  • Positive sequence under voltage
  • Negative sequence over voltage
  • Phase sequence supervision
  • Under and over-voltage/frequency has two stage settings to cover short-term as well as long-term disturbances as defined in G59/2 regulations
  • Adjustable time-delay for automatic fault reset (if required)
  • 5 relay outputs can be configured & wired to terminals (optional extra) to enable a wide range of signalling & trip methods

Sibert Micromac G59 Overview

ComAp Mainspro Comprehensive Guide

G59 Relay Enclosure Information Form