VIOX VM2-125 1-4P Miniature Circuit Breaker (MCB)
Overview
The VIOX VM2-125 Miniature Circuit Breaker (MCB) is designed for protection against overload and short circuits in AC 50Hz/60Hz systems with rated voltage 230V/400V and rated current from 20A to 125A. It’s suitable for non-frequent on-and-off switch operations under normal circumstances and is widely used in industrial, commercial, high-rise buildings, and household applications.
Key Features
- High short-circuit capacity of 10kA
- Protects circuits carrying currents up to 125A
- Contact position indication
- Suitable as main switch in household and similar installations
- Excellent price-quality ratio
Technical Specifications
- Standard: IEC/EN 60898-1
- Pole configurations: 1P, 1P+N, 2P, 3P, 3P+N, 4P
- Rated voltage: AC 230V/400V
- Rated current: 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A
- Tripping curve: C, D
- Rated short-circuit capacity (Icn): 10000A
- Rated service short-circuit capacity (Ics): 7500A
- Rated frequency: 50/60Hz
- Rated impulse withstand voltage (Uimp): 6kV
- Connection terminal: Pillar terminal with clamp
Performance Characteristics
- Electro-mechanical endurance: In≤100A = 10000 cycles, In=125A = 8000 cycles
- Terminal connection height: 20mm
- Connection capacity: Flexible conductor 35mm², Rigid conductor 50mm²
- Installation: On symmetrical DIN rail 35mm or panel mounting
Overload Current Protection Characteristics
| Test | Tripping Type | Test Current | Initial State | Tripping Time or Non-tripping Time Provision | Result |
|---|---|---|---|---|---|
| a | Time-delay | 1.05In | Cold | t≤1h (In≤63A), t≤2h (In>63A) | No Tripping |
| b | Time-delay | 1.30In | After test a | t<1h (In≤63A), t<2h (In>63A) | Tripping |
| c | Time-delay | 2In | Cold | 1s<t<60s (In≤63A), 1s<t<120s (In>63A) | Tripping |
| d | Instantaneous | 8In | Cold | t≤0.2s | No Tripping |
| e | Instantaneous | 12In | Cold | t<0.2s | Tripping |
Applications
- Industrial electrical systems
- Commercial buildings
- High-rise buildings
- Household electrical installations
Working Principle
The VIOX VM2-125 MCB operates using a bimetallic strip for overload protection and an electromagnetic mechanism for short-circuit protection. During an overload, the bimetallic strip heats and bends, releasing an electromechanical latch connected to the operating mechanism. This action opens the MCB contacts, interrupting the current flow. For short circuits, the electromagnetic mechanism provides rapid tripping. Manual reset is required to restore current flow after a trip.
