Circuit Breakers

Part Number	Description / PDF	Quantity
0900618 Phoenix Contact	CIR BRKR SOLID STATE 6A 24VDC	0
5531257 Phoenix Contact	CIR BRKR 500MA 250VAC 80VDC	0
1020001 Phoenix Contact	CIRCUIT BRAKER 8A	1045
5651507 Phoenix Contact	RDE_UC-16S1N8A80DU-12S	0
1020036 Phoenix Contact	CIRCUIT BRAKER 63A	2011
0915616 Phoenix Contact	CIR BRKR THRMMAG 4A 250VAC 65VDC	0
3000758 Phoenix Contact	CIR BRKR SOLID STATE 6A 12VDC	0
0915443 Phoenix Contact	CIR BRKR THRM-MAG 20A 250VAC	0
5531008 Phoenix Contact	CIR BRKR 1.22A 250VAC 80VDC	6
5650131 Phoenix Contact	CIR BRKR THRMMAG 3A 250VAC 80VDC	0
0914921 Phoenix Contact	CIR BRKR 300MA 250VAC 65VDC	0
3000765 Phoenix Contact	CIR BRKR SOLID STATE 6A 12VDC	330
5600309 Phoenix Contact	CIRCUIT BREAKER THRM-MAG	0
3000757 Phoenix Contact	CIR BRKR SOLID STATE 4A 12VDC	0
0914604 Phoenix Contact	THERMOMAGNETIC CIRCUIT BREAKER 1	0
0903045 Phoenix Contact	CIR BRKR SOLID STATE 4A 24VDC	0
1019960 Phoenix Contact	CIRCUIT BRAKER 12A	312
0914332 Phoenix Contact	CIR BRKR THRM-MAG 8A LEVER	0
1020087 Phoenix Contact	CIRCUIT BRAKER 6A	2110
1020067 Phoenix Contact	CIRCUIT BRAKER 7A	2510

Circuit Breakers

1. Overview

Circuit breakers are automatic electrical switches designed to protect circuits from damage caused by overloads or short circuits. Unlike fuses, they can be reset after tripping. Modern circuit breakers ensure electrical safety, prevent equipment damage, and maintain system reliability in residential, commercial, and industrial applications.

2. Main Types and Functional Classification

Type	Function Features	Application Examples
MCB (Miniature Circuit Breaker)	Thermal-magnetic protection, <100A rating	Residential wiring, lighting circuits
MCCB (Molded Case Circuit Breaker)	Adjustable trip settings, 10-2500A rating	Industrial machinery, HVAC systems
ACB (Air Circuit Breaker)	High fault current interruption, 400-6300A rating	Power distribution in data centers
RCCB (Residual Current Circuit Breaker)	Earth leakage protection (5-500mA sensitivity)	Outdoor outlets, swimming pool equipment
RCBO (Residual Current Breaker with Overcurrent)	Combines overload, short-circuit, and leakage protection	Hospital equipment, construction sites

3. Structure and Components

Typical components include: - Enclosure: Flame-retardant insulating material housing - Contacts: Silver alloy for high conductivity - Trip Mechanism: Bimetallic strip (thermal) and electromagnetic coil (magnetic) - Arc Extinguisher: Multi-plate chamber for arc suppression - Operating Lever: Manual ON/OFF control with position indicators

4. Key Technical Parameters

Parameter	Description	Importance
Rated Current (In)	Maximum continuous current without tripping	Determines load capacity
Rated Voltage (Un)	Maximum operating voltage	Ensures insulation safety
Breaking Capacity (Icu)	Maximum fault current interrupting capability	Prevents catastrophic failure
Tripping Characteristics	Time-current curve (B/C/D types)	Matches load requirements
Pole Number	1P to 4P configurations	Determines phase protection

5. Application Fields

Power distribution: Residential panels, commercial switchboards
Industrial equipment: Motors, transformers, CNC machines
Renewable energy: Solar inverters, wind turbine systems
Transportation: EV charging stations, rail traction systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Schneider Electric	Acti 9 series	Modular design, 0.5-125A range
Siemens	5SJ series	High short-circuit withstand, DIN rail mount
ABB	Emax series	Smart connectivity, up to 6300A
General Electric	THQL series	UL-certified, industrial motor protection

7. Selection Guidelines

Key considerations: - Match rated current to load requirements (125% safety margin) - Select tripping curve (Type B for resistive loads, C for motors) - Verify breaking capacity against system fault levels - Consider environmental factors (temperature, altitude) - Ensure compliance with standards (IEC 60898, UL 489) - Example: For a 20kW motor (400V), select MCCB with 63A rating, Type C curve, 50kA breaking capacity

8. Industry Trends

Emerging trends include: - Smart grid integration with IoT-enabled monitoring - Compact designs for space-constrained applications - Eco-friendly materials with halogen-free construction - Integration with renewable energy systems - Predictive maintenance via AI-powered diagnostics - Increased adoption of DC circuit breakers for EV infrastructure