Circuit Breakers

Part Number	Description / PDF	Quantity
TR11-C-X-63-B-0-C-2.5A Altech Corporation	CIRCUIT BREAK BLK SLIDERNOTBHEX	30
2C6UM Altech Corporation	2C6UM 6A CIRCUIT BREAKER C CHAR2	6
2E32UM Altech Corporation	2E32UM 32A CIRCUIT BREAKER E CHA	36
GFL2C083002 Altech Corporation	MCCB+EGFP 8A240V AC 300MA C TRIP	0
3DU13L Altech Corporation	3DU13L13AMCBDCHAR3P 480Y/277VACU	0
GFR4D20300 Altech Corporation	EGFP+OL 20A480Y277V AC 300MA D T	0
1BU05R Altech Corporation	1BU05R0.5A MCB B CHAR 1P277VACUL	96
GFL2D06010S Altech Corporation	MCCB+EGFP 6A120240V AC 10MA D TR	0
1Z08UM Altech Corporation	1Z08UM 0.8A CIRCUIT BREAKER Z CH	0
MMS-63H-65A Altech Corporation	MANUAL MOTOR START 50KA 47-65A	0
GFL2B161002 Altech Corporation	MCCB+EGFP 16A240V AC 100MA B TRI	0
GF425030 Altech Corporation	EGFP 25A480Y277V AC 30MA 3P+N 50	11
3D05UM Altech Corporation	3D05UM 0.5A CIRCUIT BREAKER D CH	16
GFR4D13030 Altech Corporation	EGFP+OL 13A480Y277V AC 30MA D TR	0
1G40UM Altech Corporation	1G40UM 40A CIRCUIT BREAKER G CHA	0
2B8UR Altech Corporation	2B8UR 8A MCB B CHAR 2 P 480Y/277	12
GFL2C16010SN Altech Corporation	MCCB+EGFP 16A120240V AC 10MA C T	0
GFL2B160102 Altech Corporation	MCCB+EGFP 16A240V AC 10MA B TRIP	0
1BU40R Altech Corporation	1BU40R 40A MCB B CHAR 1P277VACUL	0
1G50UM Altech Corporation	1G50UM 50A CIRCUIT BREAKER G CHA	468

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