Circuit Breakers

Part Number	Description / PDF	Quantity
1G12UM Altech Corporation	1G12UM 12A CIRCUIT BREAKER G CHA	12
1BU32R Altech Corporation	1BU32R 32A MCB B CHAR 1P277VACUL	36
MMS-63H-40A Altech Corporation	MANUAL MOTOR START 50KA 28-40A	0
GFL2D20300SN Altech Corporation	MCCB+EGFP 20A120240V AC 300MA D	0
2G50UM Altech Corporation	2G50UM 50A CIRCUIT BREAKER G CHA	6
GFR2B10010 Altech Corporation	EGFP+OL 10A277V AC 10MA B TRIP 1	4
3DU8R Altech Corporation	3DU8R 8AMCBDCHAR3P 480Y/277VACUL	0
GFL2C13100SN Altech Corporation	MCCB+EGFP 13A120240V AC 100MA C	0
2G03UM Altech Corporation	2G03UM 0.3A CIRCUIT BREAKER G CH	0
1C1.6DL Altech Corporation	1C1.6DL 1.6A CIRCUIT BREAKER C C	0
UV110DCL Altech Corporation	CIRCUIT BREAK UNDERVOLT 110VDC	0
3E13UM Altech Corporation	3E13UM 13A CIRCUIT BREAKER ECHAR	0
US-6 Altech Corporation	MC SURGE UNIT VARISTOR + RC 200	0
1E5UM Altech Corporation	1E5UM 5A CIRCUIT BREAKER 3 CHAR	12
GFL2D10100SN Altech Corporation	MCCB+EGFP 10A120240V AC 100MA D	0
GFL2D30100S Altech Corporation	MCCB+EGFP 30A120240V AC 100MA D	0
1D50UL Altech Corporation	1D50UL 50A CIRCUIT BREAKER D CHA	0
3CU05R Altech Corporation	3CU05R0.5AMCBCCHAR3P 480Y/277VAC	4
1D05UL Altech Corporation	1D05UL 0.5A CIRCUIT BREAKER D CH	0
GFR2C32030 Altech Corporation	EGFP+OL 32A277V AC 30MA C TRIP 1	2

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