ABB VM4 mechanical interlock unit for side-by-side interlocking of ABB AF, AFC and AFS contactors in industrial motor control systems.
£13.96
The ABB VM4 (1SBN030105T1000) is a robust mechanical interlock unit designed for the safe interlocking of two ABB AF series contactors installed side by side. It prevents both contactors from closing simultaneously, making it an essential accessory for reversing starters, changeover systems and motor control applications requiring reliable mechanical interlocking.
Manufactured to ABB's high engineering standards, the VM4 provides dependable mechanical protection without increasing the overall width of the contactor assembly. Its compact design allows straightforward installation between compatible contactors while maintaining a tidy and space-efficient control panel layout.
The VM4 includes two BB4 fixing clips and is compatible with selected ABB AF09 to AF38, AFC09 to AFC38 and AFS09 to AFS38 contactors. It is widely used by machine builders, panel manufacturers and industrial automation engineers to ensure safe reversing and changeover operation.
Mechanical interlock units are essential wherever two contactors must never close simultaneously. The ABB VM4 physically prevents one contactor from operating while the other remains energised, providing an additional level of protection beyond electrical interlocking.
Its compact design allows engineers to build reliable reversing starters and changeover assemblies without increasing panel space, making it ideal for industrial automation, motor control centres and OEM machinery.
| Phase | Three Phase |
|---|---|
| IP Rating | IP20 |
| Series | VM4 |
| Part number | 1SBN030105T1000 |
| Product type | Mechanical interlock unit |
| Accessory type | Contactor interlock |
| Mounting method | Side-by-side between contactors |
| Compatible contactors | ABB AF09...AF38, AFC09...AFC38, AFS09...AFS38 |
| Compatible poles | 3-pole and 4-pole contactors |
| Additional width required | None |
| Included accessories | 2 × BB4 fixing clips |
| Maximum mechanical switching frequency | 1800 cycles/hour |
| Protection rating | IP20 |
| Standards | IEC/EN 60947-4-1, UL 60947-1, UL 60947-4-1, CSA C22.2 |
| Product width | approx. 20 mm |
| Product height | approx. 19.8 mm |
| Product depth | approx. 10 mm |
| Weight | approx. 0.005 kg |
| EAN | 3471523130609 |
The VM4 mechanically interlocks two compatible ABB contactors to prevent them from closing at the same time.
It is designed for ABB AF09...AF38, AFC09...AFC38 and AFS09...AFS38 contactors installed side by side.
No. The VM4 is designed to fit between two contactors without adding any extra assembly width.
The VM4 is supplied with two BB4 fixing clips for secure installation.
It is commonly used in reversing starters, motor control centres, industrial automation panels and changeover switching applications.
ABB VM mechanical interlock units are trusted by electrical engineers, OEM manufacturers and panel builders to provide safe, dependable interlocking for industrial motor control and reversing applications.
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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...