ABB vm140/190 mechanical interlock unit

Why Choose the ABB VM140/190 Mechanical Interlock Unit?

The ABB VM140/190 (Part Number: 1SFN034403R1000) is a robust mechanical interlock unit engineered for safe interlocking of ABB AF series contactors in reversing and changeover motor control applications. Designed specifically for industrial automation systems, the VM140/190 prevents simultaneous operation of two contactors, helping protect motors, switching equipment and control circuits from electrical faults and mechanical damage.

The VM140/190 is designed for side-by-side mounting between ABB AF116 to AF205 contactors, including mixed-frame combinations such as AF116…AF146 with AF190…AF205. Its precision mechanical locking mechanism ensures dependable operation within demanding industrial environments while simplifying reversing starter assembly and improving overall control panel safety.

Manufactured using industrial-grade insulated materials with durable mechanical components, the ABB VM140/190 is widely used by panel builders, OEM machine manufacturers and industrial automation engineers requiring reliable motor reversing functionality within industrial control systems.

Key Advantages

• Provides reliable mechanical interlocking between two contactors.
• Prevents simultaneous operation in reversing motor starter systems.
• Compatible with ABB AF116 to AF205 contactors.
• Supports safe motor reversing and changeover applications.
• Compact side-by-side mounting arrangement.
• Industrial-grade construction for long-term durability.

Key Features

• ABB VM140/190 mechanical interlock unit.
• Part number: 1SFN034403R1000.
• Mechanical interlock for reversing contactor assemblies.
• Suitable for side-by-side mounted contactors.
• Screw terminal compatibility.
• Designed for ABB AF and AFB contactor series.
• Secure mechanical locking mechanism.
• Industrial insulated construction.

Technical Specifications

• Manufacturer: ABB
• Series: VM Mechanical Interlock Units
• Model: VM140/190
• Part number: 1SFN034403R1000
• Product type: Mechanical interlock unit
• Application: Reversing and changeover contactor interlocking
• Compatible contactors: AF116, AF140, AF146, AF190, AF205, AF116B, AF140B, AF146B, AF190B, AF205B
• Mounting type: Side-by-side contactor mounting
• Connection compatibility: Screw terminal contactors
• Construction: Industrial insulated thermoplastic and metal mechanism
• Protection function: Prevents simultaneous contactor operation
• Dimensions (W × H × D): approx. 30 × 84.9 × 41.8 mm
• Weight: approx. 0.09 kg
• Standards: EN 60947-4-1, UL 60947-4-1

Reliable Interlocking for Industrial Motor Reversing Systems

Mechanical interlock units are essential components within reversing motor starter assemblies. The ABB VM140/190 ensures that only one contactor can operate at a time, preventing dangerous simultaneous energisation conditions that could cause short circuits or equipment damage in motor reversing applications.

ABB motor control accessories are engineered for demanding industrial automation systems where safety, reliability and operational continuity are critical. The VM140/190 supports professional control panel assembly while helping ensure safe and dependable motor direction control within industrial environments.

Typical Applications

• Industrial reversing motor starters.
• Conveyor and material handling systems.
• Pump and fan direction control systems.
• Machine automation and OEM equipment.
• Industrial control panels and switchboards.
• Motor changeover and interlocking applications.

Trusted by Industrial Automation Engineers

ABB mechanical interlock accessories such as the VM140/190 are trusted worldwide for dependable motor reversing safety, reliable contactor integration and long-term industrial performance.