Circuit Breakers

Part Number	Description / PDF	Quantity
2DU32L Altech Corporation	2DU32L32A MCBDCHAR2P 480Y/277VAC	6
2C2DL Altech Corporation	2C2DL 2A CIRCUIT BREAKER C CHAR	0
GFL2C12030SN Altech Corporation	MCCB+EGFP 12A120240V AC 30MA C T	0
2Z6UM Altech Corporation	2Z6UM 6A CIRCUIT BREAKER Z CHAR2	6
GFL2D060302 Altech Corporation	MCCB+EGFP 6A240V AC 30MA D TRIP	0
1G32UM Altech Corporation	1G32UM 32A CIRCUIT BREAKER G CHA	0
GFR2B40030 Altech Corporation	EGFP+OL 40A277V AC 30MA B TRIP 1	2
1C1UM Altech Corporation	1C1UM 1A CIRCUIT BREAKER C CHAR	60
GFL2D133002 Altech Corporation	MCCB+EGFP 13A240V AC 300MA D TRI	0
DC2DU60L Altech Corporation	DC2DU60L60A MCBDCHAR 2P250VDCUL4	0
3C8UR Altech Corporation	3C8UR 8A MCB C CHAR 3 P 480Y/277	0
3CU2R Altech Corporation	3CU2R2AMCBCCHAR3P 480Y/277VACUL1	8
GFL2D30030S Altech Corporation	MCCB+EGFP 30A120240V AC 30MA D T	24
1DU30L Altech Corporation	1DU30L30A MCB DCHAR 1P 480Y/277V	588
GFR2C15100 Altech Corporation	EGFP+OL 15A277V AC 100MA C TRIP	5
1Z2.5UM Altech Corporation	1Z2.5UM 2.5A CIRCUIT BREAKER Z C	0
1C32UR Altech Corporation	1C32UR 32A MCB C CHAR 1 P 277VAC	12
3B50UR Altech Corporation	CIRCUIT BREAKER50UR 50A MCB B CH	0
GFL2B40100S Altech Corporation	MCCB+EGFP 40A120240V AC 100MA B	0
GFR4B32100 Altech Corporation	EGFP+OL 32A480Y277V AC 100MA B 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