Circuit Breakers

Part Number	Description / PDF	Quantity
2C05UM Altech Corporation	2C05UM 0.5A CIRCUIT BREAKER C CH	0
GFL2C12100S Altech Corporation	MCCB+EGFP 12A120240V AC 100MA C	0
UV60ACL Altech Corporation	CIRCUIT BREAK UNDERVOLT 60V AC C	0
MS6.3 Altech Corporation	MS63 MANUAL MOTOR CONTROLLER 4-6	0
1C10DL Altech Corporation	1C10DL 10A CIRCUIT BREAKER C CHA	0
GFL2D15010S Altech Corporation	MCCB+EGFP 15A120240V AC 10MA D T	0
1D30UR Altech Corporation	1D30UR 30A MCB D CHAR 1 P 277VAC	156
UTS250N-FTU-175 Altech Corporation	CIRCUIT BREAKER 175A/480V AC 3P	0
GF225300 Altech Corporation	EGFP 25A277V AC 300MA 1P+N 5060H	0
3D8UR Altech Corporation	3D8UR 8A MCB D CHAR 3 P 480Y/277	0
3C3.5UM Altech Corporation	3C3.5UM 3.5A CIRCUIT BREAKER C C	0
DC2CU15L Altech Corporation	DC2CU15L15A MCB CCHAR 2P 250VDC	0
3DU4L Altech Corporation	3DU4L4AMCBDCHAR3P 480Y/277VACUL4	0
1C60UM Altech Corporation	1C60UM 60A CIRCUIT BREAKER C CHA	0
1D10UR Altech Corporation	1D10UR 10A MCB D CHAR 1 P 277VAC	48
1DU02L Altech Corporation	1DU02L 0.2A MCB D CHAR 1P277VACU	0
GFR2D16010 Altech Corporation	EGFP+OL 16A277V AC 10MA D TRIP 1	0
2D40DL Altech Corporation	CIRCUIT BREAKER 40A 2P UL489	6
GFR2B08010 Altech Corporation	EGFP+OL 8A277V AC 10MA B TRIP 1P	0
GFR2C06300 Altech Corporation	EGFP+OL 6A277V AC 300MA C TRIP 1	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