Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Click to enlarge
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
Chint CB-125A MCB
CHINT NXB-63 1P-4P Type C MCB Mini Circuit Breaker 1A-63A
CHINT NXB-63 1P-4P Type C MCB Mini Circuit Breaker 1A-63A
Back to products
CHINT NHRT41 Fuse-switch Disconnector
CHINT NHRT41 Fuse-switch Disconnector

Chint CB-125A MCB

Poles
Rated Current
Tripping Curve
Breaking Capacity
Category:
Description

The CHINT CB-125A Moulded Case Circuit Breaker (MCCB) offers reliable overload and short-circuit protection for AC circuits up to 415 V and 125 A. Designed with thermomagnetic trip technology, it delivers precise fault interruption and dependable performance in demanding power distribution systems. With a 10 kA breaking capacity, robust structure, and plug-in installation, the CB-125A ensures safe, efficient operation in industrial, commercial, and infrastructure applications. Fully compliant with IEC/EN 60947-2 standards and certified by CE and TÜV.

Additional information
Poles

1P, 2P, 3P, 4P
Rated Current

63A, 80A, 100A, 125A
Tripping Curve

C, D
Breaking Capacity

10kA
Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for Chint CB-125A MCB.

📥
Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.
Request Official Datasheet (PDF)
📐
2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.
Request CAD Model
Certified Standards: IEC 60898-1, IEC 60947-2, CE, RoHS, ISO 9001:2015
Manufacturer: Shanghai Newtrend Electric Co., Ltd. (Global Export Compliance)
Engineering Support: 24-hour response for custom voltage ratings, auxiliary contacts, and technical consulting.
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.

Curve Selection

How to choose between Tripping Curves B, C, and D for this miniature circuit breaker?

A

Curve B trips at 3–5 In (designed for resistive loads, electric heating, and domestic appliances with negligible inrush). Curve C trips at 5–10 In (the standard international choice for residential and commercial lighting, socket outlets, and small induction motors). Curve D trips at 10–14 In (specifically engineered for high-inrush inductive equipment such as industrial transformers, heavy motors, compressors, and welding circuits).

Breaking Capacity

How do I determine whether 6kA or 10kA breaking capacity is required for my installation?

A

Breaking capacity (Icn/Icu) must exceed the calculated prospective short-circuit fault current at the installation point. 6kA (IEC 60898-1) is standard for residential consumer units and sub-distribution branch circuits located downstream. 10kA (IEC 60947-2) is required for industrial facilities, main switchboards, commercial distribution panels, or circuits situated close to supply transformers where fault levels are high.

Poles & Neutral Isolation

How to choose the correct number of poles (1P, 1P+N, 2P, 3P, 3P+N, 4P) for single-phase and three-phase circuits?

A

For single-phase 230V circuits: 1P provides active phase protection; 1P+N or 2P isolates both live and neutral lines simultaneously (essential for TT earthing systems and sensitive sub-panels). For three-phase 400V systems: 3P protects balanced 3-wire motor loads; 3P+N or 4P is required for 4-wire mixed single-phase loads to ensure complete neutral disconnection during isolation.

DC vs AC Application

Can this circuit breaker be used in DC circuits (Solar PV, Battery Storage, Telecom)?

A

Standard AC breakers cannot safely extinguish DC arcs due to the absence of natural zero-crossing current. For DC circuits (60V to 1000V DC), select specialized DC breakers (such as DZ158-125 DC or NM8NDC series) equipped with permanent magnetic arc-blowout chutes and strictly observe polarity wiring to prevent arc re-ignition.

Modular Accessories & Interlocks

What modular accessories and mechanical interlocks can be fitted to this breaker?

A

Standard modular clip-on accessories can be mounted directly on the side without tools: OF (Auxiliary Contact for remote status indication), SD (Alarm Contact for trip fault signaling), MX (Shunt Trip for remote emergency tripping), MN (Under-voltage Release for voltage loss protection), and NXBZ mechanical interlock kits for manual generator/mains transfer switches.

Related products

Chint NB1-63DC DC MCB
Chint NB1-63DC DC MCB

Chint NB1-63DC DC MCB

BCD Curve:C
Type:MCB
Brand Name:Chint
Place of Origin:China
Model Number:NB1-63DC
Breaking Capacity:6kA
Rated Voltage:12 - 1000V DC
Type:Mini
CHINT NXB-80 Miniature Circuit Breaker
CHINT NXB-80 Miniature Circuit Breaker

CHINT NXB-80 Miniature Circuit Breaker

CHINT NXB-80 miniature circuit breaker is designed for higher-current low-voltage distribution, panel protection, and commercial electrical systems. It is suitable for distributors, installers, and buyers looking for practical 80A DIN rail MCB products.

Chint NXHB-125 MCB

Chint NXHB-125 MCB

# Chint NXHB-125 High Breaking Capacity MCB – 10kA 125A Circuit Breaker ## Product Overview **Brand:** CHINT **Model:** NXHB-125 **Type:**
CHINT UVT-X1 Under Voltage Release for NXB-63 / NXB-40 MCB Accessories
CHINT UVT-X1 Under Voltage Release for NXB-63 / NXB-40 MCB Accessories

CHINT UVT-X1 Under Voltage Release for NXB-63 / NXB-40 MCB Accessories

Brand Name: CHINT
Product Type: Under Voltage Release / Undervoltage Release
Model: UVT-X1
Compatible Series: NXB-63, NXB-40
Rated Operation Voltage Ue: AC 240V
Rated Insulation Voltage Ui: 500V
Mounting: TH35-7.5 DIN rail after assembly with circuit breaker
Application: Automatic breaker trip and closing prevention under undervoltage conditions
Chint OUVR-2 Over Voltage and Under Voltage Protector
Chint OUVR-2 Over Voltage and Under Voltage Protector

Chint OUVR-2 Over Voltage and Under Voltage Protector

Brand Name:Chint
Place of Origin:China
Model Number:OUVR-2
CHINT SHT-X1 Shunt Release for NXB-63 / NXB-40 MCB Accessories
CHINT SHT-X1 Shunt Release for NXB-63 / NXB-40 MCB Accessories

CHINT SHT-X1 Shunt Release for NXB-63 / NXB-40 MCB Accessories

Brand Name: CHINT
Product Type: Shunt Release
Model: SHT-X1
Compatible Series: NXB-63 and NXB-40
Application: Low-voltage breaker accessory for panel and distribution systems
Chint NXU-I+II Surge Arrester (Type 1 + Type 2)
Chint NXU-I+II Surge Arrester (Type 1 + Type 2)

Chint NXU-I+II Surge Arrester (Type 1 + Type 2)

Type:T1
Brand Name:Chint
Place of Origin:China
Model Number:NXU-I+II
Rated Voltage:385V
Max Discharge current:40 A
CHINT UVT-X3 Under Voltage Release for NXB-125 MCB Accessories
CHINT UVT-X3 Under Voltage Release for NXB-125 MCB Accessories

CHINT UVT-X3 Under Voltage Release for NXB-125 MCB Accessories

Brand Name: CHINT
Product Type: Under Voltage Release / Undervoltage Release
Model: UVT-X3
Compatible Series: NXB-125
Application: Low-voltage breaker accessory for panel and distribution systems