CDB9Z DC Miniature Circuit Breaker

CDB9Z DC Miniature Circuit Breaker

The CDB9Z series DC miniature circuit breaker is a high-performance protection device designed for DC power systems, industrial equipment, OEM applications, and DC distribution systems.

The circuit breaker integrates overload protection, short circuit protection, control, and isolation functions, effectively protecting DC circuits and equipment from overload and short circuit faults while improving system safety and reliability.

The CDB9Z series supports multiple rated current options including 1A, 2A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A. It is available in 1P, 2P, and 4P configurations to meet different DC system requirements.

The product supports various DC voltage applications:

• 1P: DC125V/250V
• 2P: DC250V/500V
• 4P: DC1000V

Designed with a dedicated DC arc extinguishing structure, the circuit breaker provides reliable interruption and safe isolation performance for DC systems.

The CDB9Z supports B-type and C-type tripping curves. The B curve is suitable for loads with lower short-circuit currents, while the C curve is suitable for general loads and distribution circuits.

With a modular design, the circuit breaker can be installed on standard DIN rails and supports various accessories, including OF auxiliary contacts, SD alarm contacts, FF double auxiliary contacts, FS auxiliary alarm contacts, and MX+OF shunt release accessories.

The CDB9Z series is widely used in industrial DC systems, communication power supplies, energy storage systems, renewable energy equipment, control cabinets, and OEM applications.

Product Features

• Designed specifically for DC power system protection
• Provides overload protection, short circuit protection, and isolation functions
• Supports DC voltage applications from 125V to 1000V
• Rated current range from 1A to 63A
• Available in 1P, 2P, and 4P configurations
• Reliable DC arc extinguishing design
• Supports B and C tripping curves
• Standard DIN rail installation
• Supports multiple auxiliary accessories

Applications

• Industrial DC distribution systems
• Communication power systems
• Energy storage systems
• Solar and renewable energy equipment
• Industrial control cabinets
• OEM complete equipment

Technical Parameters

Parameter	Value	Unit
Product Series	CDB9Z	-
Product Type	DC Miniature Circuit Breaker	-
Rated Current In	1, 2, 4, 6, 10, 16, 20, 25, 32, 40, 50, 63	A
Frame Current Rating	63	A
Number of Poles	1P, 2P, 4P	-
Tripping Curve	B Type, C Type	-
Rated Operating Voltage	DC125/250/500/1000	V
Rated Impulse Withstand Voltage Uimp	6	kV
Breaking Capacity	1P: DC125V 10kA; 2P: DC250V 10kA; 1P: DC250V / 2P: DC500V 10kA; 4P: DC1000V 6kA	kA
Current Limiting Class	3	-
Mechanical Endurance	20000	Operations
Electrical Endurance	3000	Operations

Environmental Characteristics

Parameter	Value	Unit
Operating Temperature	-35~70	°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	-
Maximum Cable Capacity (1A~32A)	≤25	mm²
Maximum Cable Capacity (40A~63A)	≤35	mm²

Installation Characteristics

Parameter	Value	Unit
Installation Method	Modular design, standard DIN rail mounting	-
Protection Degree	IP20	-
Tightening Torque	2.5~3.5	N·m

Compatible Accessories

Accessory	Function
OF	Auxiliary Contact
SD	Alarm Contact
FF	Double Auxiliary Contact
FS	Auxiliary Alarm Integrated Contact
MX+OF	Shunt Release + Auxiliary Contact

Standards and Certifications

Item	Description
Applicable Standards	GB/T 14048.2, IEC/EN 60947-2
Certifications	CCC, CE, CB, SEMKO

Tripping Characteristics

Type	Characteristic
B Curve	Suitable for loads with low short-circuit current, instantaneous tripping range approximately 4.4~6.6In
C Curve	Suitable for general loads and distribution circuits, instantaneous tripping range approximately 6.8~10.2In