Electrical Power & Protection

Efficient earth leakage protection

August 2015 Electrical Power & Protection

NewElec’s earth leakage relays are becoming the preferred earth leakage protection device for all industries. This move can be attributed to the original design criteria that include harmonic filters to suppress nuisance trip conditions on starting higher kW motors on DOL. The original design permitted users to select either instantaneous or inverse tripping curves easily on the relay itself while still using the same earth leakage core balance sensing current transformer. This design remains the backbone of the now popular GA range of relays

The GA is available in diverse configuration options, including latched or non-latching main trip contact, fail-safe or non fail-safe options, as well as 110 – 220 V or 380 – 525 V AC auxiliary supply voltages. The trip contact current rating is 6 A at 220 V and 3 A at 525 V AC. A latched contactor trip changeover contact is an added safety feature, optionally reset by pressing the control panel mounted pushbutton.

Sensitivities range from 30 to 1000 mA with user-selectable instantaneous or IDMT curve selection while using the same earth leakage core. Three models are offered: the GA with a standard 74 mm x 134 mm cut-out; the GA-ELX with an adaptor plate to fit a 71 mm x 94 mm cut-out; and the compact GA MS0, designed for use on underground gully boxes. GA relays provide harmonic suppression and isolation to IEC 255-5 App A. As a door-mounted unit, the front control panel clearly displays the user-selected tripping curve by means of suitably coloured LEDs, as well as the relay trip status.

For more information contact NewElec, 086 010 3041, sales@newelec.co.za, www.newelec.co.za


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