Circuit Breakers

Part Number	Description / PDF	Quantity
3C15UR Altech Corporation	3C15UR 15A MCB C CHAR 3 P 480Y/2	24
3C16UM Altech Corporation	3C16UM 16A CIRCUIT BREAKER C CHA	0
UTS150N-FTU-100 Altech Corporation	CIRCUIT BREAKER 100A/480V AC 3P	0
GFL2D083002 Altech Corporation	MCCB+EGFP 8A240V AC 300MA D TRIP	0
2E60UM Altech Corporation	2E60UM 60A CIRCUIT BREAKER E CHA	0
2C4UL Altech Corporation	2C4UL 4A CIRCUIT BREAKER C CHAR2	66
3BU12R Altech Corporation	3BU12R12AMCBBCHAR3P 480Y/277VACU	0
1DU50R Altech Corporation	1DU50R50A MCB D CHAR 1P277VACUL1	0
1C12UR Altech Corporation	1C12UR 12A MCB C CHAR 1 P 277VAC	0
3DU12L Altech Corporation	3DU12L12AMCBDCHAR3P 480Y/277VACU	80
S-TS250NU-FTU-LL-150 Altech Corporation	CIRCUIT BREAKER 150A480V AC 3P 3	0
2C35UL Altech Corporation	2C35UL 35A CIRCUIT BREAKER C CHA	12
1C16DL Altech Corporation	1C16DL 16A CIRCUIT BREAKER C CHA	0
GFL2D150102 Altech Corporation	MCCB+EGFP 15A240V AC 10MA D TRIP	18
2C12UL Altech Corporation	2C12UL 12A CIRCUIT BREAKER C CHA	0
GFR4B05100 Altech Corporation	EGFP+OL 5A480Y277V AC 100MA B TR	0
2C1UM Altech Corporation	2C1UM 1A CIRCUIT BREAKER C CHAR2	0
2E15UM Altech Corporation	2E15UM 15A CIRCUIT BREAKER E CHA	12
GFR4B10100 Altech Corporation	EGFP+OL 10A480Y277V AC 100MA B T	1
GFR2D15030 Altech Corporation	EGFP+OL 15A277V AC 30MA D TRIP 1	2

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