Circuit Breaker Masterpact NW12H1 1250 A 3 Poles Drawout

Manufacturer	Schneider
Part Number	NW12H1
Product Type	Circuit Breakers

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Description
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Overview

NW12H1 is a 1250A frame-mounted air circuit breaker in the Masterpact NW series. It supports drawer-type and fixed installation, and can be equipped with a variety of MicroLogic electronic trip units.

Specification

Parameter	Specification
Rated Current (In)	1250A (@50°C ambient temperature)
Pole Configuration	3P (3-phase) / 4P (3-phase 4-wire), neutral conductor optional on left side
Rated Operating Voltage (Ue)	400V/440V/690V AC, Max Insulation Voltage (Ui) 1000V
Ultimate Short-Circuit Breaking Capacity (Icu)	65kA (@440V AC 50/60Hz), Ics=100% Icu (full selectivity)
Short-Time Withstand Current (Icw)	65kA/1s (Category B)
Impulse Withstand Voltage (Uimp)	12kV
Mounting Method	Two body types available: Fixed / Drawout
Compatible Trip Units	MicroLogic 2.0/2.0A, 5.0/5.0A/5.0P, 6.0/6.0A/6.0P, 7.0/7.0A/7.0P electronic trip units and TM-D thermomagnetic trip unit
Operation Method	Motor-charged spring + motor operation, manual operation optional
Weight	Fixed type: approx. 47.3kg; Drawout type (4P): approx. 54.3kg

FAQ:

1.Does the rated short circuit breaking capacity of the NW12H1 drawout vary with voltage?

The rated short-circuit breaking capacity (Icu) of the NW12H1 drawout will vary with voltage:

Voltage (AC, 50/60Hz)	Icu (Ultimate Short-Circuit Breaking Capacity)	Ics (Service Short-Circuit Breaking Capacity)
440V	65kA	100% Icu (65kA)
690V	Below 65kA (see Schneider official technical manual for exact value)	Decreases proportionally with Icu

2.Where is the wiring interface for the optional undervoltage/shunt trip of the NW12H1 drawout?

Interface/Terminal Type

Location

Terminal Number

Function

Drawout cradle secondary connector

Secondary circuit socket on the front/side of the drawout cradle, automatically connected when the body is pushed in

Shunt trip: 29, 30

Undervoltage trip: 27, 28

Power supply for shunt trip coil; Power supply for undervoltage trip coil

Breaker body control terminal block

Control wiring cavity on the left/right side of the breaker body

Shunt trip: F1, F2

Undervoltage trip: UV1, UV2

Direct wiring for trip coil, compatible with different control voltages

MicroLogic trip unit

Trip unit panel on the front of the body

Control terminals marked according to trip unit model

Signal input for shunt/undervoltage functions via trip unit

3.What is the maximum number of auxiliary contact configurations supported by NW12H1 drawout?

Contact Type	Standard Configuration	Max Expandable	Total Maximum	Contact Specification
OF (Open/Close Indication Contact)	4 sets of changeover contacts (4a4b)	Addable 2 sets of 4-contact modules	12 sets of changeover contacts (12a12b)	Standard AC-12: 5A/240V, low voltage optional
EF (Close/Connected Combined Contact)	0-1 set	Up to 8 sets	8 sets	Standard AC-12: 6A/240V
PF (Ready-to-Close Indication Contact)	0 set	Up to 2 sets	2 sets	Standard AC-12: 5A/240V
SDE (Fault Trip Indication Contact)	1 set (standard equipped)	Addable 1 set	2 sets	Standard AC-12: 5A/240V

Looking for Original New Circuit Breaker Masterpact NW12H1 1250 A 3 Poles Drawout ?

We supply this NW12H1 mainly to system integrators and maintenance teams for replacement and retrofit projects.

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