Eaton Earth Leakage Relays
A new range of earth leakage relays and current transformers has been introduced by Eaton for use with moulded-case circuit-breakers and miniature circuit-breakers in three-phase and single phase applications. A unit with adjustable sensitivity and time delay facilities offers particular flexibility to specifiers and installers.
The earth-leakage relays are DIN rail mounted and operate in conjunction with core-balance current transformers. They control the circuit-breaker operation through a shunt trip or undervoltage release. Operational status is indicated by green and red LEDs which indicate not only whether the mains is on and the breaker has tripped but also whether there is an earth leakage current flowing which is insufficient to trip the device. Leakage currents of 25 50%, 50-75% or 75-100% of the trip setting are indicated.
The adjustable relay is only 36mm (two modules) wide. It offers seven different sensitivity settings from 30mA to 5A, and seven delay settings from instantaneous (0.02s) to 5s. The cover can be sealed to prevent tampering with the setting but the test and reset functions can be operated without breaking the seal. Two fixed trip relays are also included in the range covering two of the most popular requirements; these have 30mA and 300mA trip ratings and instantaneous operation. All units are designed and tested to IEC 61008-1.
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