Circuit Breakers

Part Number	Description / PDF	Quantity
GFR2B13030 Altech Corporation	EGFP+OL 13A277V AC 30MA B TRIP 1	0
GFL2B25100S Altech Corporation	MCCB+EGFP 25A120240V AC 100MA B	0
GFR2B15030 Altech Corporation	EGFP+OL 15A277V AC 30MA B TRIP 1	13
GFL2D10010S Altech Corporation	MCCB+EGFP 10A120240V AC 10MA D T	0
GFL2C08030S Altech Corporation	MCCB+EGFP 8A120240V AC 30MA C TR	0
UV120ACR Altech Corporation	CIRCUIT BREAK UNDERVOLT 120VAC	0
GFL2D12030SN Altech Corporation	MCCB+EGFP 12A120240V AC 30MA D T	0
1G125UM Altech Corporation	1G125UM 12.5A CIRCUIT BREAKER G	0
DC2CU13L Altech Corporation	DC2CU13L13A MCB CCHAR 2P 250VDC	0
GFL2C15010S Altech Corporation	MCCB+EGFP 15A120240V AC 10MA C T	0
GF263300 Altech Corporation	EGFP 63A277V AC 300MA 1P+N 5060H	0
1D32UM Altech Corporation	1D32UM 32A CIRCUIT BREAKER D CHA	0
2Z05UM Altech Corporation	2Z05UM 0.5A CIRCUIT BREAKER Z CH	0
1G63UM Altech Corporation	1G63UM 63A CIRCUIT BREAKER G CHA	0
GFL2C101002 Altech Corporation	MCCB+EGFP 10A240V AC 100MA C TRI	0
2G8UM Altech Corporation	2G8UM 8A CIRCUIT BREAKER G CHAR2	48
2Z15UM Altech Corporation	2Z15UM 15A CIRCUIT BREAKER Z CHA	0
1CU16L Altech Corporation	1CU16L16A MCB C CHAR 1P277VACUL4	24
GFL2D060102 Altech Corporation	MCCB+EGFP 6A240V AC 10MA D TRIP	0
2D8DL Altech Corporation	CIRCUIT BREAKER 8A 2P UL489	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