mobile search button of img
icd@natus-cn.com400-928-1888
WHAT ARE YOU LOOKING FOR?
*
This field is required
Total quantity you need
*
This field is required
*
This field is required
Email format error
Due to email instability, you might miss our correspondence. Please provide your phone number for alternative contact.
This field is required
Telephone information is wrong!
Send Message

High-Voltage Switchgear

Low-Voltage Switchgear

Intelligent Components

Busway

Explosion-Proof Junction Box

Home
Intelligent Components

NTB Series Miniature Circuit Breaker & Disconnector

NTB Series Miniature Circuit Breaker & Disconnector
NTB Series Miniature Circuit Breaker & Disconnector
NTB Series Miniature Circuit Breaker & Disconnector

NATUS NTB Series is a high-performance low voltage miniature circuit breaker designed for reliable electrical protection in residential, commercial, and industrial power distribution systems. As an experienced miniature circuit breaker manufacturer, NATUS provides safe and efficient circuit protection solutions with excellent overload and short circuit protection performance.

1–100A
DIN Rail Mount
AC/DC Available
B/C/D Trip Curves
IEC 60898 Compliant
WHAT ARE YOU LOOKING FOR?
*
This field is required
Total quantity you need
*
This field is required
*
This field is required
Email format error
Due to email instability, you might miss our correspondence. Please provide your phone number for alternative contact.
This field is required
Telephone information is wrong!
Send Message

Key Benefits

icon01.png
Full product family
Standard MCB, RCBO, DC MCB and disconnector
icon02.png
Full curve coverage
Current range 1A–100A with B/C/D trip curves
icon02.png
Frame-type wiring
Frame-type wiring structure for reliable and convenient connection
icon02.png
Rich Modular Design
Modular design with rich accessory compatibility

Product Overview

NATUS low voltage circuit breaker solutions are designed for AC and DC distribution systems with rated currents from 1A to 100A. The NTB Series miniature circuit breaker provides reliable overload and short-circuit protection, with optional residual current protection for enhanced electrical safety. As a professional miniature circuit breaker supplier, NATUS offers high-performance circuit protection solutions for residential, commercial, and industrial terminal distribution applications, including AC, DC, and leakage protection scenarios.
3.jpg

Product Structure

编组 3备份 3.png
Relative Humidity: The relative atmospheric humidity at the installation site shall not exceed 50% at a maximum ambient temperature of +40°℃. Higher relative humidity is permissible at lower temperatures. The average maximum relative humidity in the wettest month shall not exceed 90%, with the average monthly temperature not exceeding +25°℃.

Technical Advantages

01.
ram-line.png
Rich accessories
Shunt trip, auxiliary contact, undervoltage coil for function expansion
02.
dashboard-2-line.png
DC-specific design
Optimized arc extinguishing for DC systems
03.
connector-line.png
DIN Rail Mounting
Standardized DIN rail mounting for fast and low-cost installation

Technical Specifications



Main technical specifications


ModelNTBA11-63
Rated Frame Current Inm (A)63
Number of poles1P2P3P4P
Rated operating voltage Ue (V)240/415415
Rated insulation voltage Ui (V)690
Rated Impulse Withstand Voltage Uimp (kV)4
Rated frequency (Hz)50/60
InstantaneousTrip Current TypeType B (3-5) In Type C (5-10) In Type D
Rated operating current In(A)1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63
Service short-circuit breaking capacity Ics (kA)6
Rated Ultimate Short-circuit Breaking Capacity Icn (kA)6
Ingress Protection RatingIP20
Mechanical and Electrical Lifespan (cycles)10000
Wiring capacityWires of 25mm² and below
Width dimension (mm)18365472



Available accessories and specifications


NameWidthRated voltageInstallation
MX18AC110~400VLeft mounting
MX+OF18AC110~400VLeft mounting
OF9—Left mounting
SD9—Left mounting

Application Scenarios
miniature circuit breaker manufacturer from China

Product FAQ

Curve B for resistive loads, Curve C for lighting and general loads, Curve D for high inrush loads like motors and transformers.
No. AC and DC miniature circuit breakers have different arc extinguishing designs. Please select the correct type for safe operation.

Yes. Standard accessories can be installed on both sides of the low voltage circuit breaker for flexible application and enhanced functionality.

Request Free Quote & Technical Data

Need customized configurations, CAD drawings, or a competitive price for this product? Submit your project requirements and our engineering team will get back to you within 24 hours.
* Describe Yourself
Quick Links
Our Products
Company
Contact Us
    Email: icd@natus-cn.com
    Tel: 400-928-1888
    Add: No. 369, Labor East Road, Tianning District, Changzhou City, Jiangsu Province
Copyright © Natus Electric Group Co., Ltd.  All rights reservedSitemap    All tags
Get a Fast Quote & Technical Support
Submit your inquiry today and our engineers will contact you within 24 hours with a competitive solution.
Company Name
*
This field is required
Email
*
This field is required
Email format error
Phone
This field is required
Telephone information is wrong!
Message
*
This field is required
Send Message