Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2B05100S Altech Corporation	MCCB+EGFP 5A120240V AC 100MA B T	0
GFL2C150102 Altech Corporation	MCCB+EGFP 15A240V AC 10MA C TRIP	12
1D4DL Altech Corporation	1D4DL 4A CIRCUIT BREAKER D CHAR	0
GFR4C25030 Altech Corporation	EGFP+OL 25A480Y277V AC 30MA C TR	0
3E3UM Altech Corporation	3E3UM 3A CIRCUIT BREAKER ECHAR3P	8
GFR2C12100 Altech Corporation	EGFP+OL 12A277V AC 100MA C TRIP	0
MMS-100H-75A Altech Corporation	MANUAL MOTOR START 50KA 55-75A	0
2C03DL Altech Corporation	2C03DL 0.3A CIRCUIT BREAKER C CH	0
3Z25UM Altech Corporation	3Z25UM 25A CIRCUIT BREAKER Z CHA	0
3E1.6UM Altech Corporation	3E1.6UM 1.6A CIRCUIT BREAKER ECH	0
2CU2L Altech Corporation	2CU2L2.0A MCBCCHAR2P 480Y/277VAC	0
1CU63L Altech Corporation	1CU63L63A MCB C CHAR 1P240VACUL4	0
UM-6R Altech Corporation	REMOTE RESET 600MM OVERLOAD RELA	0
GFR2B40100 Altech Corporation	EGFP+OL 40A277V AC 100MA B TRIP	5
2D25UL Altech Corporation	2D25UL 25A CIRCUIT BREAKER D CHA	0
GFL2D08100S Altech Corporation	MCCB+EGFP 8A120240V AC 100MA D T	0
1D30DL Altech Corporation	1D30DL 30A CIRCUIT BREAKER D CHA	24
3DU60R Altech Corporation	3DU60R 60AMCBDCHAR3P 480Y/277VAC	0
GFR2D25300 Altech Corporation	EGFP+OL 25A277V AC 300MA D TRIP	0
1C13UL Altech Corporation	1C13UL 13A CIRCUIT BREAKER C CHA	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