Siemens 49HHP22H Interlock Kit Size 3 to 3

Product Description

The SIEMENS 49HHP22H is a mechanical interlock kit designed for Size 3 to Size 3 motor starter configurations. This kit prevents two contactors or starters from being energized simultaneously, a critical safety function in reversing or transfer switching applications. It creates a physical barrier between adjacent starters, ensuring only one can close at a time. Electricians and industrial controls technicians install this hardware when building reversing starter assemblies or automatic transfer panels. The kit measures 10.5 inches long by 0.25 inches wide by 16 inches high and weighs 0.11 pounds.

This interlock kit is suited for industrial and commercial electrical control panel applications where two Size 3 Siemens starters are mounted side by side. Typical install scenarios include three-phase motor reversing circuits, multi-speed motor control, and source transfer switching. It is a direct mechanical accessory that mounts between paired starter units without requiring additional wiring. Qualified electricians and motor control specialists perform this installation as part of panel assembly or starter replacement work.

Key Features

• Mechanical interlock prevents simultaneous engagement of two paired Size 3 starters
• Designed for reversing starter and transfer switching applications
• Lightweight construction at 0.11 pounds for easy panel installation
• Compact profile at 10.5 inches by 0.25 inches by 16 inches fits standard enclosure layouts
• No additional wiring required — purely mechanical interlock action

Compatibility

Designed for use with Size 3 to Size 3 Siemens motor starter pairings as an OEM-style mechanical interlock accessory.

Installation Notes

Installation should be performed by a licensed electrician in accordance with NEC requirements and the panel manufacturer guidelines. De-energize and lock out the panel before beginning any starter or accessory installation. The interlock kit mounts mechanically between adjacent starters and must be aligned correctly to ensure proper interlock action before the enclosure is closed and power is restored. Do not force the mechanism into place, as misalignment can compromise the interlock function.

Technical Specifications

• Size Rating: Size 3 to Size 3
• Dimensions (L x W x H): 10.5 inches x 0.25 inches x 16 inches
• Weight: 0.11 pounds
• UPC: 78308708845

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 49HHP22H