Circuit Breakers

Part Number	Description / PDF	Quantity
3BU13R Altech Corporation	3BU13R13AMCBBCHAR3P 480Y/277VACU	16
2B1UR Altech Corporation	2B1UR 1A MCB B CHAR 2 P 480Y/277	18
TR20-C-63S-B3-B-7.0A-2 Altech Corporation	TR20SUPPROTBLTRIP WWHHORMA METKN	0
2Z3.5UM Altech Corporation	2Z3.5UM 3.5A CIRCUIT BREAKER Z C	0
2C63UL Altech Corporation	2C63UL 63A CIRCUIT BREAKER C CHA	0
1Z12UM Altech Corporation	1Z12UM 12A CIRCUIT BREAKER Z CHA	0
3D05UL Altech Corporation	3D05UL 0.5A CIRCUIT BREAKER D CH	0
3D16UL Altech Corporation	3D16UL 16A CIRCUIT BREAKER D CHA	40
3C32UR Altech Corporation	3C32UR 32A MCB C CHAR 3 P 480Y/2	12
1CU20R Altech Corporation	1CU20R 20A MCB C CHAR 1P277VACUL	0
GFL2C050102 Altech Corporation	MCCB+EGFP 5A240V AC 10MA C TRIP	0
GFR2B05300 Altech Corporation	EGFP+OL 5A277V AC 300MA B TRIP 1	0
2DU3R Altech Corporation	2DU3R3A MCBDCHAR2P 480Y/277VACUL	0
1DU12R Altech Corporation	1DU12R12A MCB D CHAR 1P277VACUL1	0
3C25UR Altech Corporation	3C25UR 25A MCB C CHAR 3 P 480Y/2	4
1Z30UM Altech Corporation	1Z30UM 30A CIRCUIT BREAKER Z CHA	0
2CU30R Altech Corporation	2CU30R 30A MCBCCHAR2P 480Y/277VA	0
2Z32UM Altech Corporation	2Z32UM 32A CIRCUIT BREAKER Z CHA	6
GFL2D25010SN Altech Corporation	MCCB+EGFP 25A120240V AC 10MA D T	0
1DU16L Altech Corporation	1DU16L 16A MCB D CHAR 1P277VACUL	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