ABB VM19 mechanical interlock unit designed for interlocking two ABB AF116 to AF370 contactors in industrial reversing motor starter applications.
£25.95
The ABB 1SFN030300R1000, also known as the VM19, is a robust mechanical interlock unit designed for use with ABB AF series contactors. It provides a safe mechanical interlocking function between two contactors of the same frame size, preventing both devices from closing simultaneously and ensuring safe operation in reversing and changeover motor control circuits.
Developed for industrial automation, OEM machinery and motor control applications, the VM19 installs directly between two compatible contactors. Its compact design eliminates the need for complex external interlocking mechanisms while increasing operational safety and reliability in demanding industrial environments.
Compatible with ABB AF116 to AF370 contactors of the same frame size, the ABB 1SFN030300R1000 is the ideal accessory for reversing starters, transfer switching applications and interlocked contactor assemblies requiring dependable mechanical locking.
Mechanical interlock units are essential for reversing starters and changeover applications where two contactors must never close simultaneously. The ABB VM19 provides a simple yet highly effective mechanical locking mechanism that physically prevents simultaneous operation, helping protect motors, power circuits and connected equipment.
Its durable construction and direct mounting arrangement allow panel builders and OEM manufacturers to create compact, reliable motor control systems while maintaining high safety standards throughout the installation.
| Series | VM Mechanical Interlock Units |
|---|---|
| Part number | 1SFN030300R1000 |
| Product type | Mechanical interlock unit |
| Application | Reversing and changeover contactor interlocking |
| Compatible contactors | AF116..AF370, AF116B..AF370B, AX260..AX370 |
| 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. 70 × 58.7 × 31.9 mm |
| Weight | approx. 0.05 kg |
| Standards | EN 60947-4-1, UL 60947-4-1 |
It is a mechanical interlock unit that prevents two compatible ABB contactors from closing at the same time.
The VM19 is designed for ABB AF116 to AF370 contactors of the same frame size.
Mechanical interlocking prevents simultaneous operation of reversing or changeover contactors, protecting motors and electrical systems from faults.
No. The VM19 operates purely as a mechanical interlock and does not require electrical connections.
It is installed directly between two side-by-side compatible ABB contactors in reversing or changeover motor control assemblies.
ABB VM mechanical interlock units are trusted by panel builders, OEM manufacturers and automation engineers for delivering safe, reliable interlocking in reversing motor starters and industrial 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...