Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2C40100S Altech Corporation	MCCB+EGFP 40A120240V AC 100MA C	0
GFR2B15100 Altech Corporation	EGFP+OL 15A277V AC 100MA B TRIP	5
GF240100 Altech Corporation	EGFP 40A277V AC 100MA 1P+N 5060H	77
1D63UL Altech Corporation	1D63UL 63A CIRCUIT BREAKER D CHA	0
1E40UM Altech Corporation	1E40UM 40ACIRCUIT BREAKER E CHAR	12
1C13UR Altech Corporation	1C13UR 13A MCB C CHAR 1 P 277VAC	36
18.46303/AC Altech Corporation	FI-DFS4 63A30MA230/400VAC 4P ELC	10
2BU60R Altech Corporation	2BU60R 60A MCBBCHAR2P 480Y/277VA	0
DC2DU13L Altech Corporation	DC2DU13L13A MCBDCHAR 2P250VDCUL4	0
3B30UM Altech Corporation	CIRCUIT BREAKER30UM 30A B CHAR3P	0
1E25UM Altech Corporation	1E25UM 25ACIRCUIT BREAKER E CHAR	0
2D60UM Altech Corporation	2D60UM 60A CIRCUIT BREAKER D CHA	0
1C8UL Altech Corporation	1C8UL 8A CIRCUIT BREAKER C CHAR	168
GFR4C05030 Altech Corporation	EGFP+OL 5A480Y277V AC 30MA C TRI	0
GFL2B08010SN Altech Corporation	MCCB+EGFP 8A120240V AC 10MA B TR	0
1DU30R Altech Corporation	1DU30R30A MCB D CHAR 1P277VACUL1	24
3D1.6UM Altech Corporation	3D1.6UM 1.6ACIRCUIT BREAKER D CH	4
GFR2D32100 Altech Corporation	EGFP+OL 32A277V AC 100MA D TRIP	0
3DU30R Altech Corporation	3DU30R 30AMCBDCHAR3P 480Y/277VAC	168
1C1.6UL Altech Corporation	1C1.6UL 1.6A CIRCUIT 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