Circuit Breakers

Part Number	Description / PDF	Quantity
GFR2B10100 Altech Corporation	EGFP+OL 10A277V AC 100MA B TRIP	0
3G16UM Altech Corporation	3G16UM 16ACIRCUIT BREAKER G CHAR	0
GFL2C05030SN Altech Corporation	MCCB+EGFP5A120240V AC30MA D TRIP	0
UTS150N-FTU-80 Altech Corporation	CIRCUIT BREAKER 80A/480V AC 3P 3	0
1C40UR Altech Corporation	1C40UR 40A MCB C CHAR 1 P 277VAC	48
1B20UR Altech Corporation	1B20UR 20A MCB B CHAR 1 P 277VAC	12
3D32UM Altech Corporation	3D32UM 32A CIRCUIT BREAKER D CHA	0
GFL2B12010SN Altech Corporation	MCCB+EGFP 12A120240V AC 10MA B T	0
N32UL Altech Corporation	N32UL NEUTRALP UL489 03-32A 277V	0
2CU12L Altech Corporation	2CU12L12A MCBCCHAR2P 480Y/277VAC	198
2B20UM Altech Corporation	2B20UM 20A CIRCUIT BREAKER B CHA	0
GFR4D12100 Altech Corporation	EGFP+OL 12A480Y277V AC 100MA D T	0
3D30UR Altech Corporation	3D30UR 30A MCB D CHAR 3 P 480Y/2	12
3C30UR Altech Corporation	3C30UR 30A MCB C CHAR 3 P 480Y/2	4
2DU30R Altech Corporation	2DU30R30A MCBDCHAR2P 480Y/277VAC	36
DC2CU1L Altech Corporation	DC2CU1L10A MCB CCHAR 2P 250VDC U	18
2C16DL Altech Corporation	2C16DL 16A CIRCUIT BREAKER C CHA	0
2D40UL Altech Corporation	CIRCUIT BREAKER 40A 2P UL489	6
2E12UM Altech Corporation	2E12UM 12A CIRCUIT BREAKER E CHA	0
1D25UL Altech Corporation	1D25UL 25A 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