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The Eaton M-33-3B is a Freedom NEMA mechanical interlock designed for all-pole horizontal combinations, engineered specifically for use on Sizes 3 and 4 A200 and A900 starters and contactors. This robust motor control accessory physically prevents simultaneous closure of coupled contactors to protect reversing or multi-source motor systems from short circuits and phase failure.
All-Pole Horizontal Combination: Designed to mechanically interlock side-by-side contactors or starters, ensuring precise and reliable physical sequencing.
Durable Mechanical Construction: Built to withstand rigorous industrial switching cycles without slipping or losing alignment.
Flexible Mounting: Can be easily either factory assembled or field-mounted onto compatible equipment.
Safety Certifications: Fully UL Listed and CSA Certified for industrial electrical compliance.
Applications
Reversing Motor Control Panels: Prevents forward and reverse contactors from engaging simultaneously, avoiding catastrophic line-to-line short circuits.
Multi-Source Power Switching: Utilized in complex control systems where two contactors must be mutually exclusive.
Size 3 & 4 Motor Starter Assemblies: Specifically engineered to integrate with Eaton A200 and A900 starters and contactors in sizes 3 and 4.
Buyer Guidance
Verify Contactor Size Compatibility: Ensure your existing starters or contactors are Size 3 or Size 4 A200/A900 series models, as this interlock is physically tailored for those specific dimensions.
Check Mounting Orientation: Confirm that your panel layout supports a horizontal all-pole interlock configuration between the paired units.
Professional Installation: Field-mounting requires precise mechanical alignment; ensure installation is performed by a qualified technician to maintain reliable interlock operation.
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