Circuit Breakers

Part Number	Description / PDF	Quantity
1110-F112-P1M1-1.5A E-T-A	CIR BRKR THRM 1.5A 250VAC 50VDC	0
4230-T110-K0BE-10A E-T-A	CIR BRK THERM-M 10A 277VAC/60VDC	0
5650122 Phoenix Contact	CIR BRKR 12A 250VAC 80VDC	0
GSB632PC32 Carlo Gavazzi	MCB UL1077 C 2P 32A	12
ACBP-24-V-50A OptiFuse	VER. BRACKET-TYPE I AUTO,50A 24V	0
4230-T120-K0BE-12A E-T-A	CIR BRKR THERM 12A 480VAC/125VDC	0
0903043 Phoenix Contact	CIR BRKR SOLID STATE 2A 24VDC	12
PP11-2-10.0A-XX-V Sensata Technologies – Airpax	CIR BRKR 10A 125VAC 32VDC	133
4230-T110-K0CU-1A E-T-A	CIR BRK THRM-MAG 1A 277VAC/60VDC	7
209-4-1-62-4-2-10-V Sensata Technologies – Airpax	CIR BRKR MAG-HYDR 10A 240VAC	55
1C20UM Altech Corporation	CIR BRKR THRM-MAG 20A LEVER	0
2907557 Phoenix Contact	CIR BRKR 32A 480VAC 125VDC	21
4230-T110-K0BE-25A E-T-A	CIR BRK THERM-M 25A 277VAC/60VDC	0
4404.0041 Schurter	CIR BRKR THRM 5A 240VAC 48VDC	99
2-5700-IG1-K10-DD-5A E-T-A	CIR BRKR THRM 5A 250VAC 50VDC	0
2907205 Phoenix Contact	CIR BRKR MAG-HYDR 10A 120AC/50DC	16
4230-T120-K0BE-25A E-T-A	CIR BRKR THERM 25A 480VAC/125VDC	0
4230-T120-K0DE-5A E-T-A	CIR BRK THERM-M 5A 480VAC/125VDC	0
J7MC-3P-16 Omron Automation & Safety Services	CIR BRKR MAGN 16A 690VAC ROCKER	0
2907642 Phoenix Contact	CIR BRKR 30A 277VAC 60VDC	7108

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