Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2C061002 Altech Corporation	MCCB+EGFP 6A240V AC 100MA C TRIP	0
GFL2D050302 Altech Corporation	MCCB+EGFP 5A240V AC 30MA D TRIP	24
TR11-C-X-63-B-0-A-1.0A Altech Corporation	CIRCUIT BREAK TRIP BAND KNURL ME	40
GFR4B30100 Altech Corporation	EGFP+OL 30A480Y277V AC 100MA B T	0
3DU60L Altech Corporation	3DU60L60AMCBDCHAR3P 240V ACUL489	0
1BU50R Altech Corporation	1BU50R 50A MCB B CHAR 1P277VACUL	12
TR11-C-X-63-B-1-C-1.5A Altech Corporation	CIRCUIT BREAK TPBDVERMAHEX METNU	0
GFL2B05030SN Altech Corporation	MCCB+EGFP 5A120240V AC 30MA B TR	0
2D12UR Altech Corporation	2D12UR 12A MCB D CHAR 2 P 480Y/2	0
S-TS250HU-FTU-LL-200 Altech Corporation	CIRCUIT BREAKER 200A480V AC 3P 6	0
GFL2B15300SN Altech Corporation	MCCB+EGFP 15A120240V AC 300MA B	0
2D40UR Altech Corporation	CIRCUIT BREAKER 40A MCB 2PUL1077	0
LX-20 Altech Corporation	MMS AUXILIARY SWITCH SIDE MOUNT	0
1D16UR Altech Corporation	1D16UR 16A MCB D CHAR 1 P 277VAC	12
GFR2D32030 Altech Corporation	EGFP+OL 32A277V AC 30MA D TRIP 1	0
2E4UM Altech Corporation	2E4UM 4A CIRCUIT BREAKER E CHAR2	0
2C20DL Altech Corporation	2C20DL 20A CIRCUIT BREAKER C CHA	0
GFR2D20100 Altech Corporation	EGFP+OL 20A277V AC 100MA D TRIP	2
GFL2B13100SN Altech Corporation	MCCB+EGFP 13A120240V AC 100MA B	0
GFR2B16010 Altech Corporation	EGFP+OL 16A277V AC 10MA B 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