ABB vm750h mechanical interlock unit

Why Choose the ABB VM750H Mechanical Interlock Unit?

The ABB VM750H (Part Number: 1SFN035700R1000) is a robust mechanical interlock unit designed for ABB AF400 to AF1250 series block contactors used in industrial motor control and power switching systems. Engineered for dependable interlocking performance, the VM750H prevents simultaneous closing of two contactors, improving operational safety and protecting industrial equipment from unsafe switching conditions.

Designed for horizontal mounting, the VM750H enables mechanical interlocking between two AC or DC operated contactors of the same or different ratings according to ABB configuration tables. Its heavy-duty industrial construction ensures reliable operation in demanding environments while supporting long-term durability in switchgear assemblies and motor control centres.

The ABB VM750H is widely used by panel builders, OEM machine manufacturers and industrial automation engineers requiring dependable mechanical interlocking for reversing starters, transfer systems and safety-critical switching applications. Its ABB-engineered compatibility ensures seamless integration with large AF series block contactors.

Key Advantages

• Provides reliable mechanical interlocking between two contactors.
• Prevents simultaneous contactor operation for improved safety.
• Compatible with ABB AF400 to AF1250 block contactors.
• Supports horizontal mounting configurations.
• Industrial heavy-duty construction for demanding environments.
• Improves operational safety in reversing and transfer applications.

Key Features

• ABB VM750H mechanical interlock unit.
• Part number: 1SFN035700R1000.
• Mechanical interlocking accessory for large contactors.
• Suitable for ABB AF400 to AF1250 contactor series.
• Horizontal mounting configuration.
• Compatible with AC and DC operated contactors.
• Industrial screw terminal contactor compatibility.
• Compact industrial mounting construction.

Technical Specifications

• Manufacturer: ABB
• Series: VM Mechanical Interlock Units
• Model: VM750H
• Part number: 1SFN035700R1000
• Product type: Mechanical interlock unit
• Accessory type: Contactor interlock mechanism
• Mounting orientation: Horizontal
• Compatible contactors: AF400, AF460, AF580, AF750, AF1250
• Suitable product class: Block contactors
• Terminal type: Screw terminals
• Dimensions (W × H × D): approx. 123.8 × 70 × 52 mm
• Weight: approx. 0.2 kg
• EAN: 7320500222102
• Standards: CE, UKCA, cULus compliant

Reliable Mechanical Interlocking for Industrial Safety

Mechanical interlock units are essential safety accessories used in industrial motor control systems to prevent two contactors from closing simultaneously. The ABB VM750H provides a dependable physical interlocking mechanism that improves operational safety in reversing starters, changeover systems and transfer switching applications.

ABB interlocking accessories are engineered for demanding industrial environments where operational reliability, safety and long-term durability are critical. The VM750H supports professional switchgear assembly while maintaining dependable interlocking performance in high-power industrial control systems.

Typical Applications

• Reversing motor starters.
• Industrial transfer switching systems.
• Motor control centres and switchgear.
• Industrial automation and control panels.
• OEM machinery and production equipment.
• Safety-critical industrial switching applications.

Trusted by Industrial Automation Professionals

ABB mechanical interlock accessories such as the VM750H are trusted worldwide for dependable safety performance, reliable contactor integration and long-term industrial durability.