Circuit Breakers

Part Number	Description / PDF	Quantity
DC1CU05L Altech Corporation	DC1CU05L05A MCB C CHAR 1P125VDCU	0
2D13UL Altech Corporation	2D13UL 13A CIRCUIT BREAKER D CHA	6
GFL2B40030SN Altech Corporation	MCCB+EGFP 40A120240V AC 30MA B T	0
2E10UM Altech Corporation	2E10UM 10A CIRCUIT BREAKER E CHA	18
3D6UL Altech Corporation	3D6UL 6A CIRCUIT BREAKER D CHAR3	0
MA040UM Altech Corporation	MA040UM 025-040A 3P MOTORPROTECT	0
MA25UM Altech Corporation	MA25UM 20-25A 3P MOTORPROTECTOR	36
GFR2B15300 Altech Corporation	EGFP+OL 15A277V AC 300MA B TRIP	0
3B60UR Altech Corporation	CIRCUIT BREAKER60UR 60A MCB B CH	0
GFR4B06030 Altech Corporation	EGFP+OL 6A480Y277V AC 30MA B TRI	0
GFR2C05030 Altech Corporation	EGFP+OL 5A277V AC 30MA C TRIP 1P	2
UV12ACL Altech Corporation	CIRCUIT BREAK UNDERVOLT 12VAC	0
GFL2B16100S Altech Corporation	MCCB+EGFP 16A120240V AC 100MA B	0
1BU4R Altech Corporation	1BU4R 4A MCB B CHAR 1P277VACUL10	96
1B12UR Altech Corporation	1B12UR 12A MCB B CHAR 1 P 277VAC	0
1E10UM Altech Corporation	1E10UM 10ACIRCUIT BREAKER 3 CHAR	0
DC2CU63L Altech Corporation	DC2CU63L63A MCB CCHAR 2P 250VDC	6
GFR4B20100 Altech Corporation	EGFP+OL 20A480Y277V AC 100MA B T	0
1B20UM Altech Corporation	1B20UM 20A CIRCUIT BREAKER B CHA	24
3C4UR Altech Corporation	3C4UR 4A MCB C CHAR 3 P 480Y/277	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