Circuit Breakers

Part Number	Description / PDF	Quantity
1C15UL Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	8672
1G2UM Altech Corporation	1G2UM 2A CIRCUIT BREAKER G CHAR	4
1CU2R Altech Corporation	CIR BRKR THRM-MAG 2A LEVER	28216
2D15UM Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	0
2D6UM Altech Corporation	CIR BRKR THRM-MAG 6A LEVER	51
2D3UM Altech Corporation	CIR BRKR THRM-MAG 3A LEVER	7168
3DU15R Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	23
3DU10R Altech Corporation	CIR BRKR THRM-MAG 10A LEVER	44
1C3UL Altech Corporation	CIR BRKR THRM-MAG 3A LEVER	11168
1D16UM Altech Corporation	CIR BRKR THRM-MAG 16A LEVER	14
2DU15L Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	12
1G5UM Altech Corporation	1G5UM 5A CIRCUIT BREAKER G CHAR	15
2CU63L Altech Corporation	2CU63L63A MCBCCHAR2P 240V ACUL48	4
1D5UL Altech Corporation	CIR BRKR THRM-MAG 5A LEVER	16
2D30UM Altech Corporation	CIR BRKR THRM-MAG 30A LEVER	66
GFR4C30100 Altech Corporation	EGFP+OL 30A480Y277V AC 100MA C T	2
3C60UL Altech Corporation	CIR BRKR THRM-MAG 60A LEVER	0
1BU16R Altech Corporation	CIR BRKR THRM-MAG 16A LEVER	4524
3C15UL Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	3
2D1UM Altech Corporation	2D1UM 1A CIRCUIT BREAKER D CHAR2	24

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