Circuit Breakers

Part Number	Description / PDF	Quantity
GFL2C13030S Altech Corporation	MCCB+EGFP 13A120240V AC 30MA C T	0
1D40UL Altech Corporation	1D40UL 40A CIRCUIT BREAKER D CHA	12
AP-RC-C1 24 Altech Corporation	SUPPRESSOR UNIT - MINI CONT C1 1	40
1E1.6UM Altech Corporation	1E1.6UM 1.6ACIRCUIT BREAKER 3 CH	12
UV24DCR Altech Corporation	CIRCUIT BREAK UNDERVOLT 24V DC C	0
3C8UM Altech Corporation	3C8UM 8A CIRCUIT BREAKER C CHAR3	0
GFR4B20300 Altech Corporation	EGFP+OL 20A480Y277V AC 300MA B T	0
2DU3L Altech Corporation	2DU3L3.0A MCBDCHAR2P 480Y/277VAC	0
GFL2C051002 Altech Corporation	MCCB+EGFP 5A240V AC 100MA C TRIP	6
GFL2C161002 Altech Corporation	MCCB+EGFP 16A240V AC 100MA C TRI	0
GFL2D131002 Altech Corporation	MCCB+EGFP 13A240V AC 100MA D TRI	0
3D3UR Altech Corporation	3D3UR 3A MCB D CHAR 3 P 480Y/277	0
2C32UR Altech Corporation	2C32UR 32A MCB C CHAR 2 P 480Y/2	0
1Z16UM Altech Corporation	1Z16UM 16A CIRCUIT BREAKER Z CHA	0
3BU05R Altech Corporation	3BU05R0.5A MCBBCHAR3P 480Y/277VA	4
3BU40R Altech Corporation	3BU40R40AMCBBCHAR3P 480Y/277VACU	0
1D10DL Altech Corporation	1D10DL 10A CIRCUIT BREAKER D CHA	72
RP4403 Altech Corporation	FI4403 63A 30MA 4P EARTH LEAKAGE	0
GFR4B08300 Altech Corporation	EGFP+OL 8A480Y277V AC 300MA B TR	0
GFL2D15100S Altech Corporation	MCCB+EGFP 15A120240V AC 100MA D	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