Circuit Breakers

Part Number	Description / PDF	Quantity
2DU63L Altech Corporation	2DU63L63A MCBDCHAR2P 240V ACUL48	0
3DU63R Altech Corporation	3DU63R 63AMCBDCHAR3 P 480Y/277VA	0
3C2UL Altech Corporation	3C2UL 2A CIRCUIT BREAKER C CHAR3	32
2DU60L Altech Corporation	2DU60L60A MCBDCHAR2P 240V ACUL48	120
GFL2C081002 Altech Corporation	MCCB+EGFP 8A240V AC 100MA C TRIP	0
GFR4B13300 Altech Corporation	EGFP+OL 13A480Y277V AC 300MA B T	0
DC1DU10L Altech Corporation	10A MCB D CHAR 1P125VDCUL489	180
GFL2D153002 Altech Corporation	MCCB+EGFP 15A240V AC 300MA D TRI	0
GFR2B16300 Altech Corporation	EGFP+OL 16A277V AC 300MA B TRIP	0
DC1CU6L Altech Corporation	DC1CU6L60A MCB C CHAR 1P125VDCUL	0
GFL2D15030S Altech Corporation	MCCB+EGFP 15A120240V AC 30MA D T	0
3G6UM Altech Corporation	3G6UM 6ACIRCUIT BREAKER G CHAR3P	0
GFR2B25030 Altech Corporation	EGFP+OL 25A277V AC 30MA B TRIP 1	6
1Z13UM Altech Corporation	1Z13UM 13A CIRCUIT BREAKER Z CHA	0
1C5DL Altech Corporation	1C5DL 5A CIRCUIT BREAKER C CHAR	0
2B1.6UM Altech Corporation	2B1.6UM 1.6A CIRCUIT BREAKER B C	0
1C32UM Altech Corporation	1C32UM 32A CIRCUIT BREAKER C CHA	12
GFL2B05010SN Altech Corporation	MCCB+EGFP 5A120240V AC 10MA B TR	0
TR11-C-X-63-B-0-C-3.0A Altech Corporation	CIRCUIT BREAK BLK SLIDERNOTBHEX	60
GFL2D151002 Altech Corporation	MCCB+EGFP 15A240V AC 100MA D TRI	0

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