Schneider NW16 ACB Air Circuit Breaker Unit

Module Feature

NW16 belongs to Schneider Masterpact NW series air circuit breaker, frame current 1600A.

It has multiple breaking capacity grades N1(42kA), H1(65kA), H2(100kA) for selection, 3P / 4P optional, fixed type or drawout drawer structure. Compatible with Micrologic 2.0/5.0/6.0 series trip controllers, providing overload, short-time delay, instantaneous short-circuit and earth fault protection. Drawout type has connected, test and isolated three positions, convenient for inspection and maintenance. Optional accessories include motor charging mechanism, shunt release, undervoltage release, anti-condensation heater and Modbus communication module, widely applied in industrial plants, power stations and large commercial low voltage distribution cabinets.

Working principle

When the loop current exceeds the protection setting value, the Micrologic trip unit outputs trip command.

The spring stored-energy mechanism drives main contacts to separate rapidly, the arc chute extinguishes electric arc to cut off fault circuit. Drawer mechanical interlock prevents mis-operation during racking. The breaker can upload real-time electrical parameters and fault records to SCADA, and support remote opening and closing control via communication bus.

Onboard components

Main contact assembly, arc quenching chamber, spring energy storage operating mechanism, Micrologic trip controller, LCD display module, drawer base (drawout version), motor charging assembly, shunt / undervoltage release coil, position auxiliary switch set, communication terminal block.

LED indicators

Front LEDs indicate spring charged, breaker closed, breaker open, pre-alarm warning and protection trip fault status.

Hardware self‑diagnosis

Built-in supervision detects current sensor unbalance, trip unit power loss, communication interruption and internal electronic abnormality. Fault codes and historical event logs can be checked on local LCD or uploaded to EcoStruxure Power commissioning software.

Programming software

EcoStruxure Power Commission software, used for protection curve coordination setting, fault log export, Modbus address configuration and breaker function debugging.

Electrical & Process Parameters

Model:NW16 Brand:Schneider Electric Device type:1600A frame air circuit breaker Function:Main incoming and feeder fault protection for low voltage power distribution system

Mechanical & Structure

Mounting:Fixed or draw-out chassis installation inside LV switchgear compartment Protection class:IP30 front panel Housing:Insulated reinforced frame with coated steel drawer frame (drawout version)

Environmental

Operating temperature:-25℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE, IEC 60947-2, UL

Status:Legacy Schneider low voltage distribution spare

Installation

Install matched drawer base for drawout type and complete reliable grounding.

Check mechanical interlock function, set protection coordination parameters according to upstream and downstream requirement before power-on commissioning.

Interface

Main L1/L2/L3 power contact set, auxiliary control wiring terminal block, Modbus communication port, shunt / undervoltage release wiring terminals.

Diagnostic

Protection trip: Overload, short circuit or earth fault occurs in downstream circuit, check trip log for fault type.

Unable to rack in/out: Mechanical interlock locked, breaker not at open position or foreign matter jamming.

Communication offline: Bus wiring loose, station address conflict or trip controller failure.

Product Brief

Schneider NW16 air circuit breaker, Masterpact 1600A frame ACB spare for industrial and power station main power distribution cabinet replacement.