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The WL breaker supports residual (3 wire/4 wire) and direct sensing ground fault detection modes. 
The ground fault selector switch on the ETU745 and ETU748 trip units is located on the left side of the ground fault module. The ETU776 ground fault mode configuration is via soft key selection. For the display on the ETU776 trip unit to work it must be powered by external control power or minimum required load current (greater than 100A of single phase load on 3200A and below breakers or greater than 150A of single phase load on 4000A and above breakers). The ground fault modes can not be changed while the trip unit is in ground fault pickup.
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