What this Trip System 5.0E does in the panel
The ENW21416 is a microprocessor-based control unit for Schneider Electric's EasyPact NW range of drawout air circuit breakers. It gives you LSI protection — long-time overload, short-time delay, and instantaneous short-circuit — plus earth-fault, overload, internal-fault, and short-circuit indication on the digital display. The trip unit rating spans 800 to 4000 A, so it covers the main incoming or large feeder positions in a standard industrial 690 V AC distribution board. Drawout mounting means you can rack the breaker out for maintenance or swap the trip unit without killing the bus.
Protection curves and selectivity — what the settings let you do
The long-time pickup (Ir) is adjustable from 0.4 to 1.0 x In across nine settings, and the long-time delay (Tr) at 6 x Ir runs from 0.5 to 24 seconds with a -0 to -20% accuracy band. That gives you enough range to coordinate with downstream MCCBs and still clear a bolted fault fast. Short-time pickup (Isd) adjusts from 1.5 to 10 x Ir in nine steps, with a delay (Tsd) from 100 to 400 ms in five settings — critical for zone-selective interlocking (ZSI) schemes where you want the fault-clearing breaker closest to the fault to trip first. Instantaneous pickup (Ii) goes from 2 to 15 x In, also nine settings, and you can switch it Off for full selectivity on high-fault installations.
The control unit measures 200 mm high, 55 mm wide, and 75 mm deep. Neutral position is on the left. Protected-pole configurations cover 3D, 4D, and 3D + N/2, with neutral protection settings for no protection (3D), 0.5 x Ir (3D + N/2), or 1 x Ir (4D).