Circuit Breakers

Part Number	Description / PDF	Quantity
1D35DL Altech Corporation	1D35DL 35A CIRCUIT BREAKER D CHA	36
GFL2B25300S Altech Corporation	MCCB+EGFP 25A120240V AC 300MA B	0
S-TS400NU-FTU-LL-400 Altech Corporation	CIRCUIT BREAKER 400A480V AC 3P 3	0
GFL2C20100S Altech Corporation	MCCB+EGFP20A120240V AC100MA C TR	0
3D25UM Altech Corporation	3D25UM 25A CIRCUIT BREAKER D CHA	0
2CU1L Altech Corporation	2CU1L1.0A MCBCCHAR2P 480Y/277VAC	42
3CU15R Altech Corporation	3CU15R15AMCBCCHAR3P 480Y/277VACU	24
GFL2B103002 Altech Corporation	MCCB+EGFP 10A240V AC 300MA B TRI	0
1E30UM Altech Corporation	1E30UM 30ACIRCUIT BREAKER E CHAR	0
MA063UM Altech Corporation	MA063UM 040-063A 3P MOTORPROTECT	0
DC1DU13L Altech Corporation	13A MCB D CHAR 1P125DCUL489	0
GFL2C25100S Altech Corporation	MCCB+EGFP 25A120240V AC 100MA C	0
GFL2C20030SN Altech Corporation	MCCB+EGFP 20A120240V AC 30MA C T	0
GFL2D050102 Altech Corporation	MCCB+EGFP 5A240V AC 10MA D TRIP	6
1D40DL Altech Corporation	1D40DL 40A CIRCUIT BREAKER D CHA	0
RP4430 Altech Corporation	FI4430 63A 300MA 4P EARTH LEAKAG	0
2C16UR Altech Corporation	2C16UR 16A MCB C CHAR 2 P 480Y/2	6
2D20UR Altech Corporation	2D20UR 20A MCB D CHAR 2 P 480Y/2	12
2B25UR Altech Corporation	2B25UR 25A MCB B CHAR 2 P 480Y/2	30
2B5UR Altech Corporation	2B5UR 5A MCB B CHAR 2 P 480Y/277	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