Circuit Breakers

Part Number	Description / PDF	Quantity
1B3.5UM Altech Corporation	1B3.5UM 3.5A CIRCUIT BREAKER B C	0
1C05UL Altech Corporation	1C05UL 0.5A CIRCUIT BREAKER C CH	0
GFR2D10010 Altech Corporation	EGFP+OL 10A277V AC 10MA D TRIP 1	1
GFL2B16010SN Altech Corporation	MCCB+EGFP 16A120240V AC 10MA B T	0
GFL2B30100S Altech Corporation	MCCB+EGFP 30A120240V AC 100MA B	0
2D8UM Altech Corporation	CIRCUIT BREAKER 8A 2P UL508	306
1DU20R Altech Corporation	1DU20R20A MCB D CHAR 12 1P277VAC	96
GFR4B25100 Altech Corporation	EGFP+OL 25A480Y277V AC 100MA B T	0
S-TD125NU-FMU-LL-60 Altech Corporation	CIRCUIT BREAKER 60A480V AC 3P 35	0
GFL2D08010SN Altech Corporation	MCCB+EGFP 8A120240V AC 10MA D TR	0
1C25UM Altech Corporation	1C25UM 25A CIRCUIT BREAKER C CHA	12
GFL2B16300S Altech Corporation	MCCB+EGFP 16A120240V AC 300MA B	0
GFL2C251002 Altech Corporation	MCCB+EGFP 25A240V AC 100MA C TRI	0
2Z10UL Altech Corporation	2Z10UL 10A CIRCUIT BREAKER Z CHA	0
1D25UM Altech Corporation	1D25UM 25A CIRCUIT BREAKER D CHA	0
UV24ACR Altech Corporation	CIRCUIT BREAK UNDERVOLT 24V AC C	0
GFR2B32100 Altech Corporation	EGFP+OL 32A277V AC 100MA B TRIP	0
GFL2D13010S Altech Corporation	MCCB+EGFP 13A120240V AC 10MA D T	0
1C6UR Altech Corporation	1C6UR 6A MCB C CHAR 1 P 277VAC U	36
3C16UL Altech Corporation	3C16UL 16A CIRCUIT BREAKER C CHA	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