Circuit Breakers

Part Number	Description / PDF	Quantity
0900113 Phoenix Contact	CIR BRKR SOLID STATE 1A 24VDC	0
2800927 Phoenix Contact	CIR BRKR SOLID STATE	0
3000756 Phoenix Contact	CIR BRKR SOLID STATE 3A 12VDC	43
1020083 Phoenix Contact	CIRCUIT BREAKER 2A	2434
2908716 Phoenix Contact	MULTI-CHANNEL ELECTRONIC DEVICE	0
0914646 Phoenix Contact	CIR BRKR 2.5A 250VAC 65VDC	0
1019951 Phoenix Contact	CIRCUIT BREAKER 1A	2518
0914934 Phoenix Contact	CIR BRKR THRM-MAG 400MA LEVER	0
1019952 Phoenix Contact	CIRCUIT BREAKER 2A	2317
0901002 Phoenix Contact	CIR BRKR SOLID STATE 10A 24VDC	0
1019935 Phoenix Contact	CIRCUIT BRAKER 6A	2356
0915032 Phoenix Contact	CIR BRKR THRM-MAG 15A 250VAC	0
0914280 Phoenix Contact	TMC 1 F1 200 2 5A	0
1020093 Phoenix Contact	CIRCUIT BRAKER 12A	2512
2908713 Phoenix Contact	MULTI-CHANNEL ELECTRONIC DEVICE	0
1020029 Phoenix Contact	CIRCUIT BRAKER 25A	2312
0903047 Phoenix Contact	CIR BRKR SOLID STATE 8A 24VDC	2
1020062 Phoenix Contact	CIRCUIT BREAKER 3A	3159
0902292 Phoenix Contact	CIR BRKR THRM-MAG 50A 277VAC	0
1019959 Phoenix Contact	CIRCUIT BRAKER 10A	1943

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