Circuit Breakers

Part Number	Description / PDF	Quantity
3C10UR Altech Corporation	3C10UR 10A MCB C CHAR 3 P 480Y/2	8
2B10UR Altech Corporation	2B10UR 10A MCB B CHAR 2 P 480Y/2	0
1D2DL Altech Corporation	1D2DL 2A CIRCUIT BREAKER D CHAR	0
2CU1R Altech Corporation	2CU1R 1A MCBCCHAR2P 480Y/277VACU	0
1D03UL Altech Corporation	1D03UL 0.3A CIRCUIT BREAKER D CH	12
2C4UM Altech Corporation	2C4UM 4A CIRCUIT BREAKER C CHAR2	12
1C25UR Altech Corporation	1C25UR 25A MCB C CHAR 1 P 277VAC	36
GFL2B32030SN Altech Corporation	MCCB+EGFP 32A120240V AC 30MA B T	0
2C60UR Altech Corporation	2C60UR 60A MCB C CHAR 2 P 480Y/2	6
GFR2D40300 Altech Corporation	EGFP+OL 40A277V AC 300MA D TRIP	0
1C25UL Altech Corporation	1C25UL 25A CIRCUIT BREAKER C CHA	48
GFR2C25100 Altech Corporation	EGFP+OL 25A277V AC 100MA C TRIP	0
GFL2C12300S Altech Corporation	MCCB+EGFP 12A120240V AC 300MA C	0
2B50UR Altech Corporation	2B50UR 50A MCB B CHAR 2 P 480Y/2	54
1ZU50L Altech Corporation	1ZU50L50A MCB Z CHAR 1P277VACUL4	0
GFL2C15100S Altech Corporation	MCCB+EGFP 15A120240V AC 100MA C	0
2D13UR Altech Corporation	2D13UR 13A MCB D CHAR 2 P 480Y/2	0
1D50DL Altech Corporation	1D50DL 50A CIRCUIT BREAKER D CHA	0
GFR4C05300 Altech Corporation	EGFP+OL 5A480Y277V AC 300MA C TR	0
GFL2B06010S Altech Corporation	MCCB+EGFP 6A120240V AC 10MA B TR	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