Circuit Breakers

Part Number	Description / PDF	Quantity
3C50UL Altech Corporation	CIR BRKR THRM-MAG 50A LEVER	0
2DU1L Altech Corporation	CIR BRKR THRM-MAG 1A LEVER	12
1D15UM Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	72
1D1UM Altech Corporation	CIR BRKR THRM-MAG 1A LEVER	31132
1C5UL Altech Corporation	CIR BRKR THRM-MAG 5A LEVER	6660
3G15UM Altech Corporation	CIR BRKR THRM-MAG 15A LEVER	0
GFL2B150102 Altech Corporation	MCCB+EGFP 15A240V AC 10MA B TRIP	0
3CU32L Altech Corporation	3CU32L32AMCBCCHAR3P 480Y/277VACU	10
2C5UL Altech Corporation	2C5UL 5A CIRCUIT BREAKER C CHAR2	8336
1C1UL Altech Corporation	CIR BRKR THRM-MAG 1A LEVER	35
MMS-32H-32A Altech Corporation	MANUAL MOTOR START 30KA 22-32A	16
GFL2C150302 Altech Corporation	MCCB+EGFP 15A240V AC 30MA C TRIP	2736
2D8UL Altech Corporation	CIR BRKR THRM-MAG 8A LEVER	0
3C10UL Altech Corporation	CIR BRKR THRM-MAG 10A LEVER	3544
2DU8L Altech Corporation	CIR BRKR THRM-MAG 8A LEVER	356
2C8UL Altech Corporation	CIR BRKR THRM-MAG 8A LEVER	8
3C63UL Altech Corporation	CIR BRKR THRM-MAG 63A LEVER	10
2C6UR Altech Corporation	2C6UR 6A MCB C CHAR 2 P 480Y/277	12
2D20UM Altech Corporation	CIR BRKR THRM-MAG 20A LEVER	3612
3D30UM Altech Corporation	CIR BRKR THRM-MAG 30A LEVER	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