Circuit Breakers

Part Number	Description / PDF	Quantity
3B13UR Altech Corporation	CIRCUIT BREAKER 13A B 3P 277V UL	4
1D1UL Altech Corporation	1D1UL 1A CIRCUIT BREAKER D CHAR	48
3G13UM Altech Corporation	3G13UM 13ACIRCUIT BREAKER G CHAR	0
MA20UM Altech Corporation	MA20UM 16-20A 3P MOTORPROTECTOR	0
TR11-D-Y-63-BB-2-N-7.0A Altech Corporation	CIRCUIT BREAK WHITE TRIP BAND 7A	200
2D16DL Altech Corporation	2D16DL 16A CIRCUIT BREAKER D CHA	0
GFL2C25030S Altech Corporation	MCCB+EGFP 25A120240V AC 30MA C T	0
2Z2.5UM Altech Corporation	2Z2.5UM 2.5A CIRCUIT BREAKER Z C	0
GFL2C15030SN Altech Corporation	MCCB+EGFP 15A120240V AC 30MA C T	0
MMS-63H-50A Altech Corporation	MANUAL MOTOR START 50KA 34-50A	0
US-12 Altech Corporation	SURGE UNIT VARISTOR 100 125VACDC	0
US-5 Altech Corporation	SURGE UNIT VARISTOR + RC 100 125	0
1B3UM Altech Corporation	1B3UM 3A CIRCUIT BREAKER B CHAR	24
2DU1R Altech Corporation	2DU1R1A MCBDCHAR2P 480Y/277VACUL	264
GFL2D32300S Altech Corporation	MCCB+EGFP 32A120240V AC 300MA D	0
GFL2C16010S Altech Corporation	MCCB+EGFP 16A120240V AC 10MA C T	0
GFL2D101002 Altech Corporation	MCCB+EGFP 10A240V AC 100MA D TRI	0
3G40UM Altech Corporation	3G40UM 40A MCB G CHAR 3 P 480Y/2	0
1C63UR Altech Corporation	1C63UR 63A MCB C CHAR 1 P 277VAC	0
3CU6R Altech Corporation	3CU6R6AMCBCCHAR3P 480Y/277VACUL1	4

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