Circuit Breakers

Part Number	Description / PDF	Quantity
DC2DU05L Altech Corporation	DC2DU05L05A MCBDCHAR 2P250VDCUL4	6
DC2CU40L Altech Corporation	DC2CU40L40A MCB CCHAR 2P 250VDC	0
2E30UM Altech Corporation	2E30UM 30A CIRCUIT BREAKER E CHA	0
GFL2D10300S Altech Corporation	MCCB+EGFP 10A120240V AC 300MA D	0
UTS250N-FTU-250 Altech Corporation	CIRCUIT BREAKER 250A/480V AC 3P	0
2Z30UM Altech Corporation	2Z30UM 30A CIRCUIT BREAKER Z CHA	18
GFR2B30100 Altech Corporation	EGFP+OL 30A277V AC 100MA B TRIP	0
3Z40UM Altech Corporation	3Z40UM 40A CIRCUIT BREAKER Z CHA	0
2E03UM Altech Corporation	2E03UM 0.3A CIRCUIT BREAKER 3 CH	12
2C60UL Altech Corporation	2C60UL 60A CIRCUIT BREAKER C CHA	0
2CU3L Altech Corporation	2CU3L3.0A MCBCCHAR2P 480Y/277VAC	0
GFR4D32300 Altech Corporation	EGFP+OL 32A480Y277V AC 300MA D T	0
GFL2C13300SN Altech Corporation	MCCB+EGFP 13A120240V AC 300MA C	0
1D50UM Altech Corporation	1D50UM 50A CIRCUIT BREAKER D CHA	24
2DU02L Altech Corporation	2DU02L0.2A MCBDCHAR2P 480Y/277VA	0
2G3.5UM Altech Corporation	2G3.5UM 3.5A CIRCUIT BREAKER G C	0
3D3.5UM Altech Corporation	3D3.5UM 3.5A CIRCUIT BREAKER D C	0
S-TD125NU-FTU-LL-80 Altech Corporation	CIRCUIT BREAKER 80A480V AC 3P 35	0
1DU4L Altech Corporation	1DU4L 4.0A MCB D CHAR 1P277VACUL	24
1C075UM Altech Corporation	1C075UM 0.75ACIRCUIT BREAKER C C	12

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