Circuit Breakers

Part Number	Description / PDF	Quantity
TR11-C-Y-63-B-0-C-9.0A Altech Corporation	CIRCUIT BREAK SLIDE MET NUT 9A	0
1CU30L Altech Corporation	1CU30L30A MCB C CHAR 1P277VACUL4	0
GFR2D20300 Altech Corporation	EGFP+OL 20A277V AC 300MA D TRIP	0
3D50UL Altech Corporation	3D50UL 50A CIRCUIT BREAKER D CHA	44
GFL2C10030S Altech Corporation	MCCB+EGFP 10A120240V AC 30MA C T	0
GFL2C16300SN Altech Corporation	MCCB+EGFP 16A120240V AC 300MA C	0
1CU8L Altech Corporation	1CU8L8.0A MCB C CHAR 1P277VACUL4	132
1Z25UM Altech Corporation	1Z25UM 25A CIRCUIT BREAKER Z CHA	0
2B13UM Altech Corporation	2B13UM 13A CIRCUIT BREAKER B CHA	0
1D1UR Altech Corporation	1D1UR 1A MCB D CHAR 1 P 277VAC U	36
MA1.0UM Altech Corporation	MA10UM 063-10A 3P MOTORPROTECTOR	0
3B2UM Altech Corporation	CIRCUIT BREAKER2UM 2A B CHAR3P48	0
DC2DU02L Altech Corporation	DC2DU02L02A MCBDCHAR 2P250VDCUL4	0
2C4DL Altech Corporation	2C4DL 4A CIRCUIT BREAKER C CHAR	0
RP4203 Altech Corporation	RP4203 25A 30MA 4P EARTH LEAKAGE	0
2D03UL Altech Corporation	2D03UL 0.3A CIRCUIT BREAKER D CH	0
2Z2UM Altech Corporation	2Z2UM 2A CIRCUIT BREAKER Z CHAR2	0
GFR2D25010 Altech Corporation	EGFP+OL 25A277V AC 10MA D TRIP 1	0
2E05UM Altech Corporation	2E05UM 0.5A CIRCUIT BREAKER 3 CH	12
GFL2C32300S Altech Corporation	MCCB+EGFP 32A120240V AC 300MA C	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