Circuit Breakers

Part Number	Description / PDF	Quantity
GFR4B16100 Altech Corporation	EGFP+OL 16A480Y277V AC 100MA B T	0
1BU6R Altech Corporation	1BU6R 6A MCB B CHAR 1P277VACUL10	0
GFL2B253002 Altech Corporation	MCCB+EGFP 25A240V AC 300MA B TRI	0
1C50UR Altech Corporation	1C50UR 50A MCB C CHAR 1 P 277VAC	0
GFL2D200302 Altech Corporation	MCCB+EGFP 20A240V AC 30MA D TRIP	0
1C15UM Altech Corporation	1C15UM 15ACIRCUIT BREAKER C CHAR	0
MMS-100H-40A Altech Corporation	MANUAL MOTOR START 65KA 28-40A	0
3D63UR Altech Corporation	3D63UR 63A MCB D CHAR 3 P 480Y/2	0
DC2DU15L Altech Corporation	DC2DU15L15A MCBDCHAR 2P250VDCUL4	0
1C4UM Altech Corporation	1C4UM 4A CIRCUIT BREAKER C CHAR	120
3Z6UM Altech Corporation	3Z6UM 6A CIRCUIT BREAKER Z CHAR3	0
DC2CU4L Altech Corporation	DC2CU4L40A MCB CCHAR 2P 250VDC U	6
3BU4R Altech Corporation	3BU4R4AMCBBCHAR3P 480Y/277VACUL1	0
S-TS250NU-FTU-LL-200 Altech Corporation	CIRCUIT BREAKER 200A480V AC 3P 3	0
2B1UM Altech Corporation	2B1UM 1A CIRCUIT BREAKER B CHAR2	0
3C03UM Altech Corporation	3C03UM 0.3A CIRCUIT BREAKER C CH	0
GFR2D08100 Altech Corporation	EGFP+OL 8A277V AC 100MA D TRIP 1	0
GFL2D253002 Altech Corporation	MCCB+EGFP 25A240V AC 300MA D TRI	12
MS025 Altech Corporation	MS025 MANUAL MOTOR CONTROLLER 01	0
1B15UM Altech Corporation	1B15UM 15A CIRCUIT BREAKER B CHA	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