Circuit Breakers

Part Number	Description / PDF	Quantity
1G60UM Altech Corporation	1G60UM 60A CIRCUIT BREAKER G CHA	12
GFL2C32030SN Altech Corporation	MCCB+EGFP 32A120240V AC 30MA C T	0
GFR2B30300 Altech Corporation	EGFP+OL 30A277V AC 300MA B TRIP	0
GFL2C16300S Altech Corporation	MCCB+EGFP 16A120240V AC 300MA C	0
GFR4C32030 Altech Corporation	EGFP+OL 32A480Y277V AC 30MA C TR	0
GFL2C25030SN Altech Corporation	MCCB+EGFP 25A120240V AC 30MA C T	0
1BU13R Altech Corporation	1BU13R 13A MCB B CHAR 1P277VACUL	12
GFL2C15300S Altech Corporation	MCCB+EGFP 15A120240V AC 300MA C	12
3E63UM Altech Corporation	3E63UM 63A CIRCUIT BREAKER ECHAR	0
2E8UM Altech Corporation	2E8UM 8A CIRCUIT BREAKER E CHAR2	0
GFL2D20100SN Altech Corporation	MCCB+EGFP 20A120240V AC 100MA D	0
3DU16R Altech Corporation	3DU16R 16AMCBDCHAR3P 480Y/277VAC	0
GFR4B15030 Altech Corporation	EGFP+OL 15A480Y277V AC 30MA B TR	1
GFL2D061002 Altech Corporation	MCCB+EGFP 6A240V AC 100MA D TRIP	0
2C2UR Altech Corporation	2C2UR 2A MCB C CHAR 2 P 480Y/277	0
DC2DU10L Altech Corporation	DC2DU10L10A MCBDCHAR 2P250VDCUL4	0
1E4UM Altech Corporation	1E4UM 4A CIRCUIT BREAKER 3 CHAR	12
3BU20R Altech Corporation	3BU20R20AMCBBCHAR3P 480Y/277VACU	32
GFL2C25010S Altech Corporation	MCCB+EGFP 25A120240V AC 10MA C T	0
2D12UL Altech Corporation	2D12UL 12A CIRCUIT BREAKER D 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