✅ 33911 – Schneider Electric Mechanical Interlocking Kit (for Compact NS630b to NS1600 Fixed Devices) The Schneider Electric 33911 is a complete mechanical interlocking kit designed for secure and reliable source changeover between two fixed-mounted circuit breakers from the Compact NS series (NS630b to NS1600). This kit ensures that only one of the two breakers (typically mains and backup) can be in the closed position at a time, providing a safe interlock to avoid power back-feed. It’s a critical accessory in manual or automatic transfer systems for low-voltage installations. This kit includes all necessary components to interlock two fixed devices and is composed of: Part No. 33209 – 2 cables (2.5 meters each) for mechanical interlocking between two NT/NW or NS devices (fixed or drawout). Part No. 33200 – Adaptation fixture for interlocking cable interface on Masterpact NT fixed version. Part No. 33647 – Support brackets to suit Compact NS630b to NS1600 fixed frames (set of 2 parts). 🔧 Technical Specifications: Specification Details Part Number 33911 Brand Schneider Electric Kit Components 33209, 33200, 33647 Device Compatibility Compact NS630b to NS1600 (Fixed type) Breaker Type Fixed-mounted Compact NS (source/bypass) Cable Length 2 × 2.5 meters Mechanical Type Mechanical Interlocking Interlock Mode Breaker A or B can be ON – not both Installation Suitable for front-panel mounting Typical Use Case Manual or motorized source changeover systems 🌟 Key Features: ✅ Complete Mechanical Interlocking Solution for source/bypass breaker pairs. ✅ Ensures Electrical Safety by preventing simultaneous closure of two supplies. ✅ Robust Design for industrial-grade applications and long-term reliability. ✅ Flexible Installation for any combination of NT/NW/NS fixed breakers. ✅ Schneider Original Components included for guaranteed compatibility. 🧰 Applications: Source/bypass configurations in LV panels. Manual and automatic transfer switch systems. Emergency power supply systems (e.g., generator/mains). Electrical distribution in commercial and industrial plants.