Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2C25300SN Altech Corporation	MCCB+EGFP 25A120240V AC 300MA C	0
2G4UM Altech Corporation	2G4UM 4A CIRCUIT BREAKER G CHAR2	0
2C12DL Altech Corporation	2C12DL 12A CIRCUIT BREAKER C CHA	0
UV110ACR Altech Corporation	CIRCUIT BREAK UNDERVOLT 110VAC	0
1Z05UM Altech Corporation	1Z05UM 0.5A CIRCUIT BREAKER Z CH	0
1B1UM Altech Corporation	1B1UM 1A CIRCUIT BREAKER B CHAR	48
2KU2L Altech Corporation	2KU2L2.0A MCBKCHAR2P 480Y/277VAC	0
2C3UM Altech Corporation	2CUM 3A CIRCUIT BREAKER C CHAR2P	0
2G40UM Altech Corporation	2G40UM 40A CIRCUIT BREAKER G CHA	6
GFL2B13030S Altech Corporation	MCCB+EGFP 13A120240V AC 30MA B T	0
1CU4L Altech Corporation	1CU4L4.0A MCB C CHAR 1P277VACUL4	0
3D1UR Altech Corporation	3D1UR 1A MCB D CHAR 3 P 480Y/277	0
3D8UL Altech Corporation	3D8UL 8A CIRCUIT BREAKER D CHAR3	0
DC1DU2L Altech Corporation	20A MCB D CHAR 1P125VDCUL489	1260
1B2.5UM Altech Corporation	1B2.5UM 2.5A CIRCUIT BREAKER B C	0
1G25UM Altech Corporation	1G25UM 25A CIRCUIT BREAKER G CHA	168
3D35UL Altech Corporation	3D35UL 35A CIRCUIT BREAKER D CHA	0
GFL2C05010S Altech Corporation	MCCB+EGFP 5A120240V AC 10MA C TR	0
3C13UR Altech Corporation	3C13UR 13A MCB C CHAR 3 P 480Y/2	0
GFL2C12010SN Altech Corporation	MCCB+EGFP 12A120240V AC 10MA C T	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