CDB9P Phase + Neutral Miniature Circuit Breaker

CDB9P Phase + Neutral Miniature Circuit Breaker

The CDB9P series phase and neutral miniature circuit breaker is designed for low-voltage terminal distribution systems, providing reliable protection for residential buildings, infrastructure projects, and civil electrical applications.

With a 1P+N configuration, the circuit breaker provides simultaneous protection for both phase and neutral conductors. It integrates overload protection, short circuit protection, control, and isolation functions to improve the safety and reliability of electrical systems.

The CDB9P series features a rated operating voltage of 230VAC, rated current range from 6A to 40A, and breaking capacity up to 4.5/6kA, meeting various terminal load protection requirements.

The product adopts thermal-magnetic tripping technology and supports C-type tripping curves, making it suitable for standard loads and distribution circuit protection. Its fast closing mechanism reduces contact arc impact, improving electrical endurance and operational reliability.

With a modular structure, the circuit breaker can be easily installed on standard DIN rails. It supports top and bottom wiring and uses tunnel-type terminals with a maximum connection capacity of 16mm².

The CDB9P series supports various accessories, including OF auxiliary contacts, SD alarm contacts, MX+OF shunt release, overvoltage release, and undervoltage release, providing extended control and protection functions.

Product Features

• Phase and neutral conductor protection in a compact 1P+N design
• Provides overload protection and short circuit protection
• Supports isolation function
• Suitable for residential buildings and infrastructure applications
• Rated current range from 6A to 40A
• Breaking capacity up to 6kA
• C-type tripping curve for standard loads and distribution circuits
• Standard DIN rail installation
• Supports multiple accessories for extended functions

Applications

• Residential distribution systems
• Commercial building electrical systems
• Infrastructure projects
• Terminal distribution boards
• Low-voltage civil protection systems

Technical Parameters

Parameter	Value	Unit
Product Series	CDB9P	-
Product Type	Phase + Neutral Miniature Circuit Breaker	-
Number of Poles	1P+N	-
Rated Operating Voltage Ue	230	VAC
Rated Current In	6, 10, 16, 20, 25, 32, 40	A
Frame Current Rating	40	A
Rated Frequency	50/60	Hz
Breaking Capacity	4.5/6	kA
Isolation Function	Clear isolation indication	-
Fast Closing Function	Ensures reliable operation of neutral loads and extends electrical life	-
Mechanical Endurance	20000	Operations
Electrical Endurance	4000	Operations

Environmental Characteristics

Parameter	Value	Unit
Operating Temperature	-30~70	°C
Altitude	≤2000	m
Damp Heat Resistance	Category 2 (55°C, Relative Humidity 95%)	-
Application Environment	Locations without significant vibration or impact	-

Wiring Characteristics

Parameter	Value	Unit
Terminal Type	Tunnel-type terminal	-
Wiring Direction	Top and bottom wiring available	-
Maximum Cable Capacity	≤16	mm²

Installation Characteristics

Parameter	Value	Unit
Installation Method	Modular design, standard DIN rail mounting	-
DIN Rail Size	35mm DIN rail	-
Locking Method	Upper and lower locking clips	-
Rated Tightening Torque	1.5	N·m

Protection and Certifications

Item	Description
Protection Degree	IP20
Applicable Standards	GB 10963.1, IEC/EN 60898-1
Certifications	CCC, CE, CB, TUV

Tripping Characteristics

Type	Characteristic
C Curve	Instantaneous tripping range 5~10In