Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2B06100S Altech Corporation	MCCB+EGFP 6A120240V AC 100MA B T	0
GFR4C15300 Altech Corporation	EGFP+OL 15A480Y277V AC 300MA C T	0
1D13UM Altech Corporation	1D13UM 13A CIRCUIT BREAKER D CHA	0
GFL2C06100S Altech Corporation	MCCB+EGFP 6A120240V AC 100MA C T	0
1C10UR Altech Corporation	1C10UR 10A MCB C CHAR 1 P 277VAC	0
3DU02L Altech Corporation	3DU02L0.2AMCBDCHAR3P 480Y/277VAC	20
GFL2B40300SN Altech Corporation	MCCB+EGFP 40A120240V AC 300MA B	0
GFR2C05010 Altech Corporation	EGFP+OL 5A277V AC 10MA C TRIP 1P	2
RP2303 Altech Corporation	RP2303 40A 30MA 2P EARTH LEAKAGE	0
1Z1UL Altech Corporation	1Z1UL 1A CIRCUIT BREAKER Z CHAR	0
GFR4D13100 Altech Corporation	EGFP+OL 13A480Y277V AC 100MA D T	0
2CU63R Altech Corporation	2CU63R 63A MCBCCHAR2P 480Y/277VA	0
GFR2B16030 Altech Corporation	EGFP+OL 16A277V AC 30MA B TRIP 1	0
3G63UM Altech Corporation	3G63UM 63ACIRCUIT BREAKER G CHAR	0
2D32DL Altech Corporation	2D32DL 32A CIRCUIT BREAKER D CHA	6
1CU12L Altech Corporation	1CU12L12A MCB C CHAR 1P277VACUL4	24
GFR2C05300 Altech Corporation	EGFP+OL 5A277V AC 300MA C TRIP 1	0
1Z30UL Altech Corporation	1Z30UL 30A CIRCUIT BREAKER Z CHA	24
2CU02L Altech Corporation	2CU02L0.2A MCBCCHAR2P 480Y/277VA	0
3G8UM Altech Corporation	3G8UM 8ACIRCUIT BREAKER G CHAR3P	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