Circuit Breakers

Part Number	Description / PDF	Quantity
3CU16R Altech Corporation	3CU16R16AMCBCCHAR3P 480Y/277VACU	8
GFL2C06300SN Altech Corporation	MCCB+EGFP 6A120240V AC 300MA C T	0
1BU30R Altech Corporation	1BU30R 30A MCB B CHAR 1P277VACUL	60
3B5UM Altech Corporation	CIRCUIT BREAKER5UM 5A B CHAR3P48	0
1D13UR Altech Corporation	1D13UR 13A MCB D CHAR 1 P 277VAC	0
GFR2C20030 Altech Corporation	EGFP+OL 20A277V AC 30MA C TRIP 1	52
GFR4C10030 Altech Corporation	EGFP+OL 10A480Y277V AC 30MA C TR	0
GFR2B13300 Altech Corporation	EGFP+OL 13A277V AC 300MA B TRIP	0
MMS-100H-90A Altech Corporation	MANUAL MOTOR START 50KA 70-90A	0
GFL2D25100S Altech Corporation	MCCB+EGFP 25A120240V AC 100MA D	0
2Z4UM Altech Corporation	2Z4UM 4A CIRCUIT BREAKER Z CHAR2	18
2B16UM Altech Corporation	2B16UM 16A CIRCUIT BREAKER B CHA	0
2CU60L Altech Corporation	2CU60L60A MCBCCHAR2P 240V ACUL48	6
UTS250N-FTU-225 Altech Corporation	CIRCUIT BREAKER 225A/480V AC 3P	0
GFL2B16030S Altech Corporation	MCCB+EGFP 16A120240V AC 30MA B T	0
1D6UM Altech Corporation	1D6UM 6A CIRCUIT BREAKER D CHAR	0
GFR4D25030 Altech Corporation	EGFP+OL 25A480Y277V AC 30MA D TR	0
GFL2C12100SN Altech Corporation	MCCB+EGFP 12A120240V AC 100MA C	6
3C50UM Altech Corporation	3C50UM 50ACIRCUIT BREAKER C CHAR	0
3C13UL Altech Corporation	3C13UL 13A CIRCUIT BREAKER C 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