Cutler Hammer-Eaton C321KM50 Mechanical Interlock for Contactors

Description

Cutler Hammer-Eaton C321KM50 Mechanical Interlock

The Cutler Hammer-Eaton C321KM50 Mechanical Interlock is a precision-engineered accessory designed to prevent the simultaneous energization of two contactors or motor starters. By physically blocking one contactor from closing while the other is engaged, this interlock provides a critical layer of safety and operational reliability in reversing motor control circuits, two-speed motor applications, and other systems where inadvertent simultaneous contact closure could cause equipment damage or hazardous conditions.

Key Features

• Mechanical interlock designed for use with compatible Cutler Hammer-Eaton contactors and motor starters
• Prevents simultaneous engagement of two contactors, eliminating the risk of phase-to-phase short circuits
• Ideal for reversing starters, two-speed motor controls, and transfer switching applications
• Robust construction ensures long service life in demanding industrial and commercial HVAC environments
• Easy field installation — mounts directly between paired contactors without additional hardware
• Manufactured by Cutler Hammer-Eaton, a trusted name in electrical control components

Typical Applications

• Reversing motor starter circuits
• Two-speed motor control panels
• Commercial HVAC compressor and fan motor control
• Industrial motor control centers (MCCs)
• Transfer and changeover switching systems

Why Choose the C321KM50?

Cutler Hammer-Eaton has long been a leader in motor control and protection components. The C321KM50 Mechanical Interlock reflects that legacy of quality, providing a simple yet highly effective means of enforcing operational exclusivity between paired contactors. Its direct-mount design minimizes wiring complexity while maximizing panel space efficiency — an essential consideration in tight HVAC electrical enclosures.