Circuit Breakers

Part Number	Description / PDF	Quantity
1019923 Phoenix Contact	CIRCUIT BRAKER 30A	4344
1020082 Phoenix Contact	CIRCUIT BREAKER 1A	2313
0902234 Phoenix Contact	CIR BRKR THRM-MAG 13A 277VAC	0
1020014 Phoenix Contact	CIRCUIT BRAKER 63A	2521
5600509 Phoenix Contact	CIR BRKR 50MA 250VAC 80VDC	0
5531053 Phoenix Contact	CIR BRKR 3.5A 250VAC 80VDC	2
0914727 Phoenix Contact	CIR BRKR 16A 250VAC 65VDC	0
0915645 Phoenix Contact	CIRCUIT BREAKER THRM-MAG 8A	0
1020051 Phoenix Contact	CIRCUIT BRAKER 16A	2487
5530915 Phoenix Contact	CIRCUIT BREAKER THRM-MAG	68
1019922 Phoenix Contact	CIRCUIT BRAKER 25A	1478
0903040 Phoenix Contact	CIR BRKR SOLID STATE 500MA 24VDC	0
1011962 Phoenix Contact	CIRCUIT BREAKER 1A	12
1020044 Phoenix Contact	CIRCUIT BRAKER 8A	2546
0914950 Phoenix Contact	CIR BRKR 600MA 250VAC 65VDC	22
1020046 Phoenix Contact	CIRCUIT BRAKER 12A	9634
1020031 Phoenix Contact	CIRCUIT BRAKER 32A	257
1020064 Phoenix Contact	CIRCUIT BREAKER 4A	53
0915797 Phoenix Contact	CIRCUIT BREAKER THRM-MAG 4A	0
1019933 Phoenix Contact	CIRCUIT BREAKER 4A	622

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