Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2B13010SN Altech Corporation	MCCB+EGFP 13A120240V AC 10MA B T	0
GFR2D13100 Altech Corporation	EGFP+OL 13A277V AC 100MA D TRIP	0
1D3UM Altech Corporation	1D3UM 3A CIRCUIT BREAKER D CHAR	12
GFL2D32100SN Altech Corporation	MCCB+EGFP 32A120240V AC 100MA D	0
DC1DU15L Altech Corporation	15A MCB D CHAR 1P125VDCUL489	48
1CU60R Altech Corporation	1CU60R 60A MCB C CHAR 1P277VACUL	0
MMS-32H-2.5A Altech Corporation	MANUAL MOTOR START 65KA 16-25A	0
1DU32R Altech Corporation	1DU32R32A MCB D CHAR 1P277VACUL1	12
1G20UM Altech Corporation	1G20UM 20A CIRCUIT BREAKER G CHA	0
1CU8R Altech Corporation	1CU8R 8A MCB C CHAR 1P277VACUL10	12
1B15UR Altech Corporation	1B15UR 15A MCB B CHAR 1 P 277VAC	0
GFL2C40300S Altech Corporation	MCCB+EGFP 40A120240V AC 300MA C	0
GFR2C13010 Altech Corporation	EGFP+OL 13A277V AC 10MA C TRIP 1	0
DC1DU63L Altech Corporation	63A MCB D CHAR 1P125VDCUL489	0
GFL2B15010SN Altech Corporation	MCCB+EGFP 15A120240V AC 10MA B T	0
1D8DL Altech Corporation	1D8DL 8A CIRCUIT BREAKER D CHAR	0
GFL2B121002 Altech Corporation	MCCB+EGFP 12A240V AC 100MA B TRI	0
1CU4R Altech Corporation	1CU4R 4A MCB C CHAR 1P277VACUL10	0
2C32UM Altech Corporation	2C32UM 32A CIRCUIT BREAKER C CHA	0
DC1DU16L Altech Corporation	16A MCB D CHAR 1P125VDCUL489	12

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