Circuit Breakers

Part Number	Description / PDF	Quantity
3CU1L Altech Corporation	3CU1L1.0AMCBCCHAR3P 480Y/277VACU	16
1BU60R Altech Corporation	1BU60R 60A MCB B CHAR 1P277VACUL	0
DC2CU8L Altech Corporation	DC2CU8L80A MCB CCHAR 2P 250VDC U	6
2C3.5UM Altech Corporation	2C3.5UM 3.5A CIRCUIT BREAKER C C	0
3CU63L Altech Corporation	3CU63L63AMCBCCHAR3P 240V ACUL489	32
GFL2D160102 Altech Corporation	MCCB+EGFP 16A240V AC 10MA D TRIP	0
GFL2D12100S Altech Corporation	MCCB+EGFP 12A120240V AC 100MA D	0
GFR4C10300 Altech Corporation	EGFP+OL 10A480Y277V AC 300MA C T	0
1Z6UM Altech Corporation	1Z6UM 6A CIRCUIT BREAKER Z CHAR	0
GFR4D15300 Altech Corporation	EGFP+OL 15A480Y277V AC 300MA D T	0
1D12UR Altech Corporation	1D12UR 12A MCB D CHAR 1 P 277VAC	24
2B13UR Altech Corporation	2B13UR 13A MCB B CHAR 2 P 480Y/2	0
GFL2B060302 Altech Corporation	MCCB+EGFP 6A240V AC 30MA B TRIP	6
3DU40L Altech Corporation	3DU40L40AMCBDCHAR3P 240V ACUL489	4
3D2UM Altech Corporation	3D2UM 2A CIRCUIT BREAKER D CHAR3	8
GFL2D16300S Altech Corporation	MCCB+EGFP 16A120240V AC 300MA D	0
2BU4R Altech Corporation	2BU4R 4A MCBBCHAR2P 480Y/277VACU	0
GFR4C05100 Altech Corporation	EGFP+OL 5A480Y277V AC 100MA C TR	0
GFR4C30030 Altech Corporation	EGFP+OL 30A480Y277V AC 30MA C TR	1
UTS150N-FTU-150 Altech Corporation	CIRCUIT BREAKER 150A/480V AC 3P	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