Circuit Breakers

Part Number	Description / PDF	Quantity
1D16UL Altech Corporation	1D16UL 16A CIRCUIT BREAKER D CHA	12
3G32UM Altech Corporation	3G32UM 32ACIRCUIT BREAKER G CHAR	0
GFR4D16030 Altech Corporation	EGFP+OL 16A480Y277V AC 30MA D TR	0
GFL2B05030S Altech Corporation	MCCB+EGFP 5A120240V AC 30MA B TR	0
2Z1UM Altech Corporation	2Z1UM 1A CIRCUIT BREAKER Z CHAR2	6
3D1UM Altech Corporation	3D1UM 1ACIRCUIT BREAKER D CHAR3P	0
GFL2D160302 Altech Corporation	MCCB+EGFP 16A240V AC 30MA D TRIP	0
GFL2B10030S Altech Corporation	MCCB+EGFP 10A120240V AC 30MA B T	0
2C5UR Altech Corporation	2C5UR 5A MCB C CHAR 2 P 480Y/277	6
MMS-63H-10A Altech Corporation	MANUAL MOTOR START 65KA 6-10A	0
2D8UR Altech Corporation	2D8UR 8A MCB D CHAR 2 P 480Y/277	0
DC1CU60L Altech Corporation	DC1CU60L60A MCB C CHAR 1P125VDCU	0
GFR2C05100 Altech Corporation	EGFP+OL 5A277V AC 100MA C TRIP 1	4
2G05UM Altech Corporation	2G05UM 0.5A CIRCUIT BREAKER G CH	0
1CU02L Altech Corporation	1CU02L0.2A MCB C CHAR 1P277VACUL	12
1Z50UL Altech Corporation	1Z50UL 50A CIRCUIT BREAKER Z CHA	12
1Z40UM Altech Corporation	1Z40UM 40A CIRCUIT BREAKER Z CHA	0
3B60UM Altech Corporation	CIRCUIT BREAKER60UM 60A B CHAR3P	0
3B20UR Altech Corporation	CIRCUIT BREAKER20UR 20A MCB B CH	180
1CU60L Altech Corporation	1CU60L60A MCB C CHAR 1P240VACUL4	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