CDB9-125 High Current Miniature Circuit Breaker

CDB9-125 High Current Miniature Circuit Breaker

The CDB9-125 series high current miniature circuit breaker is a high-performance protection device designed for industrial equipment, OEM applications, and low-voltage distribution systems.

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

The CDB9-125 series supports rated current options of 63A, 80A, 100A, and 125A, with multiple pole configurations including 1P, 2P, 3P, and 4P. It features a rated operating voltage of 230/400VAC and a breaking capacity of up to 10kA, meeting the protection requirements of industrial applications.

The product adopts thermal-magnetic tripping technology and supports C and D tripping curves. The C curve is suitable for standard loads and distribution circuits, while the D curve is designed for equipment with high inrush currents.

With a modular design, the circuit breaker can be easily installed on standard DIN rails. It features tunnel-type terminals with a maximum cable connection capacity of 50mm² and supports various accessories, including OF/SD auxiliary contacts, MX+OF shunt release, overvoltage release, and undervoltage release.

The CDB9-125 series is widely used in industrial control cabinets, mechanical equipment, power distribution systems, and OEM complete equipment.

Product Features

• Provides overload protection, short circuit protection, control, and isolation functions
• High current design with rated current up to 125A
• Available in 1P, 2P, 3P, and 4P configurations
• Breaking capacity up to 10kA
• Supports C and D tripping curves
• Modular structure for standard DIN rail installation
• Supports multiple auxiliary accessories
• Suitable for industrial equipment and OEM applications

Applications

• Industrial control cabinets
• Automation equipment
• Mechanical equipment power protection
• OEM complete equipment
• Low-voltage industrial distribution systems

Technical Parameters

Parameter	Value	Unit
Product Series	CDB9-125	-
Product Type	High Current Miniature Circuit Breaker	-
Rated Current In	63, 80, 100, 125	A
Frame Current Rating	125	A
Number of Poles	1P, 2P, 3P, 4P	-
Tripping Curve	C Type, D Type	-
Rated Operating Voltage Ue	230/400 AC	V
Rated Impulse Withstand Voltage Uimp	6	kV
Breaking Capacity	10	kA
Rated Frequency	50/60	Hz
Mechanical Endurance	20000	Operations
Electrical Endurance	10000	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	-
Maximum Cable Capacity	≤50	mm²

Installation Characteristics

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

Compatible Accessories

Accessory	Function
OF/SD	Auxiliary contact and alarm contact (installed on the left side of breaker)
MX+OF	Shunt release + auxiliary contact (installed on the right side of breaker)
Overvoltage Release	Overvoltage protection
Undervoltage Release	Undervoltage protection

Standards and Certifications

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

Tripping Characteristics

Type	Characteristic
C Curve	Suitable for standard loads and distribution circuits, instantaneous tripping range 5~10In
D Curve	Suitable for high inrush current loads, instantaneous tripping range 10~14In