nader NDW3 Series Manual page 9

When the drawout type circuit breaker is in the separation position, pull out the black lever below the
drawer to lock. Then the circuit breaker body can only pull out the drawer seat, and cannot be shaken to the
"test" or "connection" position. Padlock should be prepared by users, with the specification of
3mm~5mm(NDW3-1600) or 4mm~8mm(NDW3-2500/4000/6300/7500).
 Drawout type circuit breaker three-position lock
On the drawer seat, there's "connection", "test" and "separation" position status, which is indicated through
a indicator.
When the rocker shakes, the circuit breaker will be locked respectively in these three positions, and
unlocked only through the unlocking button (red).
1.5 Product Features
1.5.1 Efficient arc extinguishing and breaking
■ The design of the circuit breaker arc extinguishing chamber and contact system has a number of
invention patents. It adopts the principle of air-blast and magnetic arc extinguishing, optimizes the arc
extinguishing gate design, increases the driving force of arc, and improves the breaking ability of the
product. In addition, it also designs and optimizes the time for acquiring signal and giving command
by the controller, and can greatly shorten the time when there is a large fault current.
■ Zero flashover
1.5.2 High electrical life and short time tolerance ability
The body design adopts high strength reinforced moulded plastics, and has extremely high impact
strength and insulating properties. The design of the arcing contact structure improves the electrical life of
products; the greatly optimized design of the contact system and operating mechanism realizes compensation
to the contact pressure, and improves the product reliability and short time tolerance ability with more strength
of the metal structure.
1.5.3 The controllers are of full range and versatile
■ ■ NWK21/NWK31 type controller - Digital tube display, practical function and simplicity, which can
adapt to the low-temperature places with the optional voltage measurement function;
■ NWK22/NWK32 type controller - LCD display, multiple and diversified functions, with optional
voltage and harmonics measurement and protection functions. Applicable to high-end application
places, and more powerful if applied to intelligent system;
■ Measurement and protection: With current, voltage, frequency, phase sequence, power, power factor
and harmonics measurement and protection functions
■ Current protection features: A variety of overload long-time delay protection, a variety of short
circuit short-time delay protection, short circuit transient protection, earthing protection, neutral
line
Internal & confidential file
文件编号:NDT2920213
第 9 页 共 149 页
文件版本:17