ABB VM140/190 mechanical interlock unit designed for interlocking ABB AF116 to AF205 contactors in industrial reversing motor starter applications.
£25.95
The ABB 1SFN034403R1000, also known as the VM140/190, is a robust mechanical interlock unit designed for use with ABB AF series contactors. It provides a reliable mechanical interlocking function between two compatible contactors, preventing both devices from closing simultaneously and ensuring safe operation in reversing motor starters and changeover applications.
Designed for industrial automation, machine builders and OEM panel manufacturers, the VM140/190 installs directly between two side-by-side contactors. Its compact design eliminates the need for complex external interlocking mechanisms while improving operational safety, reducing installation time and ensuring dependable long-term performance in demanding industrial environments.
Compatible with ABB AF116 to AF205 contactors, including interlocking AF116 to AF146 with AF190 to AF205, the ABB 1SFN034403R1000 is the ideal accessory for reversing starters, transfer switching systems and industrial motor control assemblies.
Mechanical interlock units are essential in reversing starters and transfer switching applications where two contactors must never close simultaneously. The ABB VM140/190 provides a dependable mechanical locking mechanism that physically prevents simultaneous operation, helping protect motors, power circuits and connected equipment.
Its durable construction and direct mounting arrangement enable panel builders and OEM manufacturers to create compact, reliable motor control systems while maintaining high standards of operational safety and long-term reliability.
| Series | VM Mechanical Interlock Units |
|---|---|
| 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 |
It is a mechanical interlock unit that prevents two compatible ABB contactors from closing simultaneously in reversing and changeover applications.
It is designed for ABB AF116 to AF205 contactors and supports interlocking AF116 to AF146 with AF190 to AF205 contactors.
Mechanical interlocking prevents simultaneous operation of reversing or transfer contactors, protecting motors and electrical systems from short circuits and equipment damage.
No. The unit operates purely mechanically and requires no electrical connections.
It is mounted directly between two compatible ABB contactors in reversing motor starters and industrial transfer switching assemblies.
ABB VM mechanical interlock units are trusted by panel builders, OEM manufacturers and automation engineers for delivering dependable mechanical interlocking, enhanced operational safety and reliable long-term performance in industrial motor control systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...