Circuit Breakers

Part Number	Description / PDF	Quantity
1CU50L Altech Corporation	1CU50L50A MCB C CHAR 1P240VACUL4	12
3B16UM Altech Corporation	CIRCUIT BREAKER 16A B 3P 277 CUL	8
1B1UR Altech Corporation	1B1UR 1A MCB B CHAR 1 P 277VAC U	0
3B3UR Altech Corporation	CIRCUIT BREAKER3UR 3A MCB B CHAR	0
3G50UM Altech Corporation	3G50UM 50ACIRCUIT BREAKER G CHAR	0
1B4UR Altech Corporation	1B4UR 4A MCB B CHAR 1 P 277VAC U	0
2D30UR Altech Corporation	2D30UR 30A MCB D CHAR 2 P 480Y/2	0
DC1DU8L Altech Corporation	80A MCB D CHAR 1P125VDCUL489	12
GFR2D05030 Altech Corporation	EGFP+OL 5A277V AC 30MA D TRIP 1P	0
1Z1UM Altech Corporation	1Z1UM 1A CIRCUIT BREAKER Z CHAR	0
2G63UM Altech Corporation	2G63UM 63A CIRCUIT BREAKER G CHA	0
GFR2D13030 Altech Corporation	EGFP+OL 13A277V AC 30MA D TRIP 1	0
DC1CU3L Altech Corporation	DC1CU3L30A MCB C CHAR 1P125VDCUL	60
DC2CU50L Altech Corporation	DC2CU50L50A MCB CCHAR 2P 250VDC	0
DC1CU25L Altech Corporation	DC1CU25L25A MCB C CHAR 1P125VDCU	12
AP-RC-C1 110 Altech Corporation	SUPPRESSOR UNIT - MINI CONT C1 4	30
TR11-D-Y-63-BB-2-N-10.0A Altech Corporation	CIRCUIT BREAK WHITE TRIP BAND 10	280
GFR4D30030 Altech Corporation	EGFP+OL 30A480Y277V AC 30MA D TR	0
GFR4D05300 Altech Corporation	EGFP+OL 5A480Y277V AC 300MA D TR	0
3D13UL Altech Corporation	3D13UL 13A CIRCUIT BREAKER D CHA	8

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