Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2B163002 Altech Corporation	MCCB+EGFP 16A240V AC 300MA B TRI	0
S-UVT-24 Altech Corporation	UNDERVLTG TRIP ACDC 24V FOR S-TD	0
3BU50R Altech Corporation	3BU50R50AMCBBCHAR3P 480Y/277VACU	0
3D03UL Altech Corporation	3D03UL 0.3A CIRCUIT BREAKER D CH	0
DC2CU30L Altech Corporation	DC2CU30L30A MCB CCHAR 2P 250VDC	0
GFR4D20100 Altech Corporation	EGFP+OL 20A480Y277V AC 100MA D T	0
UV48DCL Altech Corporation	CIRCUIT BREAK UNDERVOLT 48V DC C	0
2DU05R Altech Corporation	2DU05R0.5A MCBDCHAR2P 480Y/277VA	0
1Z15UM Altech Corporation	1Z15UM 15A CIRCUIT BREAKER Z CHA	12
TR11-C-X-63-B-0-C-1.2A Altech Corporation	CIRCUIT BREAK TRIP BAND HEX MET	10
2E2.5UM Altech Corporation	2E2.5UM 2.5A CIRCUIT BREAKER 3 C	18
GFL2B120302 Altech Corporation	MCCB+EGFP 12A240V AC 30MA B TRIP	0
2BU5R Altech Corporation	2BU5R 5A MCBBCHAR2P 480Y/277VACU	0
1D63UR Altech Corporation	1D63UR 63A MCB D CHAR 1 P 277VAC	36
2CU13R Altech Corporation	2CU13R 13A MCBCCHAR2P 480Y/277VA	270
UTS150N-FTU-60 Altech Corporation	CIRCUIT BREAKER 60A/480V AC 3P 3	1
2B40UR Altech Corporation	2B40UR 40A MCB B CHAR 2 P 480Y/2	12
UTE100N-FTU-40 Altech Corporation	CIRCUIT BREAKER 40A/480V AC 3P 3	0
3BU8R Altech Corporation	3BU8R8AMCBBCHAR3P 480Y/277VACUL1	0
1C3DL Altech Corporation	1C3DL 3A CIRCUIT BREAKER C CHAR	12

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