Chint NKB1 Control & Protective Switching Device

Name: Chint NKB1 Control & Protective Switching Device
Brand: CHINT
SKU: 1769741316800913408

Brand Name:Chint
Place of Origin:China
Model Number:NKB1
Certification:CCC, CE

Poles

Rated Current

Rated Voltage

Rated Power

The Chint NKB1 Control & Protective Switching Device is a CPS (Control and Protective Switching Device) that integrates the functions of contactor, circuit breaker, and overload relay into a single, compact unit. Designed for motor control and protection up to 0.1A - 630A, the NKB1 offers significant space savings and simplified wiring for motor control centers, pump stations, HVAC systems, and industrial machinery.

CPS vs Traditional Components - Advantages

Function	Traditional Solution	NKB1 CPS
Switching	Contactor	✓ Integrated
Overload Protection	Thermal Relay	✓ Integrated
Short-Circuit Protection	Circuit Breaker	✓ Integrated
Space Required	~3-4 DIN modules	~1-2 DIN modules only

Function

Traditional Solution

NKB1 CPS

Switching

Contactor

✓ Integrated

Overload Protection

Thermal Relay

✓ Integrated

Short-Circuit Protection

Circuit Breaker

✓ Integrated

Space Required

~3-4 DIN modules

~1-2 DIN modules only

Key Features

FAQs

A: Choose NKB1 CPS when: panel space is limited, you want simplified wiring, cost reduction is important, or you need integrated communication capability. For very large motors (>125A), separate high-capacity components may still be preferred.

Description

Chint original NKB1 series CPS NKB1-45 NKB1-125 3P 16A 45A 80A 125A CHNT Control and Protective Switching Device

Chint NKB1 series control & protective switching device (CPS) is mainly applied to circuit with AC current frequency of
50 Hz or 60Hz, rated operational voltage up to 690V and rated operational current from 1A to 125A used for it is making, carrying and breaking currents under normal conditions, including specified overload conditions and for making, carrying for a specified time and breaking currents under specified abnormal conditions such as those of short-circuits.

NBK1 series CPS is applied to power distribution and motor protection & control of various occasions or systems, e.g. infrastructure, buildings, communications, etc.

Standard: IEC60947-6-2 Multiple function equipment- Control and protective switching devices (or equipment) (CPS).

Additional information

Poles	3P
Rated Current	1A, 3A, 6A, 12A, 16A, 25A, 32A, 45A, 63A, 80A, 100A, 125A
Rated Power	0.12kW – 55kW
Rated Voltage	AC 690V

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for Chint NKB1 Control & Protective Switching Device.

📥

Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

📐

2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Voltage & Load Sizing

How to verify rated operational voltage, frequency, and load duty cycle?

Verify that the nominal line voltage (AC 230V single-phase or 400V/415V/690V three-phase at 50/60Hz, or DC voltage ratings) falls within the continuous maximum operating limits of the device. Check duty cycle ratings (continuous vs intermittent duty) to ensure thermal stability under full load.

Protection & Environment

What ingress protection (IP Rating) and environmental enclosures are recommended?

For clean indoor electrical rooms, standard IP20 modular DIN-rail housings are recommended. For outdoor, industrial washdown, or dusty environments, mount components inside weatherproof enclosures rated IP65/IP66 with UV-resistant polycarbonate or powder-coated steel enclosures equipped with compression cable glands.

Selectivity & Grading

How to ensure upstream and downstream coordination in power distribution boards?

Ensure proper discrimination by grading current thresholds and tripping time delays: upstream devices should have higher current ratings and intentional short-time delays (Class S), allowing downstream branch MCBs to clear localized faults without blacking out the entire facility.

Installation & Mounting

What mounting rails, busbars, and spatial clearances are required?

Components mount on standard symmetrical 35mm DIN rail (EN 60715 / TH35-7.5) or backplate screw fixings. Maintain recommended top/bottom ventilation gaps (typically 30–50mm) to ensure unrestricted air convection, and use standard pin/fork comb busbars to minimize contact resistance and wiring errors.

Conductor & Torque Sizing

What conductor sizes and terminal tightening torques should be applied?

Select copper or aluminum conductor cross-sections complying with IEC 60364-5-52 current-carrying capacity tables based on continuous load. Always use a calibrated torque screwdriver or torque wrench to tighten terminal screws to the manufacturer-specified torque to prevent hot-spot degradation and loose connections.