Circuit Breakers

Part Number	Description / PDF	Quantity
3E30UM Altech Corporation	3E30UM 30A CIRCUIT BREAKER ECHAR	4
2E50UM Altech Corporation	2E50UM 50A CIRCUIT BREAKER E CHA	0
2CU20R Altech Corporation	2CU20R 20A MCBCCHAR2P 480Y/277VA	12
GFL2C060302 Altech Corporation	MCCB+EGFP 6A240V AC 30MA C TRIP	6
RP2330 Altech Corporation	RP2330 40A 300MA 2P EARTH LEAKAG	0
GFR2D40030 Altech Corporation	EGFP+OL 40A277V AC 30MA D TRIP 1	0
GFL2D30300SN Altech Corporation	MCCB+EGFP 30A120240V AC 300MA D	0
2BU8R Altech Corporation	2BU8R 8A MCBBCHAR2P 480Y/277VACU	0
GFL2D16100S Altech Corporation	MCCB+EGFP 16A120240V AC 100MA D	0
3E03UM Altech Corporation	3E03UM 0.3A CIRCUIT BREAKER ECHA	0
UTE100N-FTU-60 Altech Corporation	CIRCUIT BREAKER 60A/480V AC 3P 3	0
3BU3R Altech Corporation	3BU3R3AMCBBCHAR3P 480Y/277VACUL1	0
GFL2D150302 Altech Corporation	MCCB+EGFP 15A240V AC 30MA D TRIP	24
GFL2D06100SN Altech Corporation	MCCB+EGFP 6A120240V AC 100MA D T	0
1G8UM Altech Corporation	1G8UM 8A CIRCUIT BREAKER G CHAR	0
GFL2C250102 Altech Corporation	MCCB+EGFP 25A240V AC 10MA C TRIP	0
DC1CU10L Altech Corporation	DC1CU10L10A MCB C CHAR 1P125VDCU	0
2CU25L Altech Corporation	2CU25L25A MCBCCHAR2P 480Y/277VAC	318
GFL2D25100SN Altech Corporation	MCCB+EGFP 25A120240V AC 100MA D	0
2G3UM Altech Corporation	2G3UM 3A CIRCUIT BREAKER G CHAR2	24

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