ABB VM96-4 mechanical interlock unit for side-by-side interlocking of ABB AF, AFC and AFS contactors in industrial motor control systems.
£109.20
The ABB VM96-4 (1SBN033405T1000) is a heavy-duty mechanical interlock unit designed to safely interlock 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 industrial motor control applications where safe operation is critical.
Engineered to ABB's high quality standards, the VM96-4 provides dependable mechanical protection without increasing the overall width of the contactor assembly. Its compact construction allows straightforward installation between compatible contactors while maintaining a neat and space-efficient control panel layout.
Designed for ABB AF40 to AF96, AFC40 to AFC96 and AFS40 to AFS96 contactors, the VM96-4 includes two BB4 fixing clips for secure installation. It is widely specified by panel builders, OEM manufacturers and industrial automation engineers for reliable reversing and changeover motor starter assemblies.
Mechanical interlock units provide an essential safety function by physically preventing two contactors from closing simultaneously. The ABB VM96-4 delivers reliable interlocking protection that complements electrical interlocking, helping protect motors, control equipment and operators during reversing and changeover operations.
Its compact design enables machine builders and panel manufacturers to create dependable reversing starters without increasing enclosure size, making it an ideal solution for industrial automation, motor control centres and OEM equipment.
| Phase | Three Phase |
|---|---|
| IP Rating | IP20 |
| Series | VM96 |
| Part number | 1SBN033405T1000 |
| Product type | Mechanical interlock unit |
| Accessory type | Contactor interlock |
| Mounting method | Side-by-side between contactors |
| Compatible contactors | ABB AF40...AF96, AFC40...AFC96, AFS40...AFS96 |
| 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 No. 60947-4-1 |
| Product width | approx. 20 mm |
| Product height | approx. 19.8 mm |
| Product depth | approx. 10 mm |
| Weight | approx. 0.006 kg |
| EAN | 3471523130937 |
The VM96-4 mechanically interlocks two compatible ABB contactors to prevent them from closing simultaneously during reversing or changeover operation.
It is designed for ABB AF40...AF96, AFC40...AFC96 and AFS40...AFS96 contactors installed side by side.
No. The VM96-4 is specifically designed to fit between two contactors without increasing the overall assembly width.
The mechanical interlock unit is supplied complete with two BB4 fixing clips for secure installation.
It is commonly installed in reversing starters, motor control centres, industrial automation systems and changeover switching applications.
ABB VM mechanical interlock units are trusted by electrical engineers, OEM manufacturers and panel builders to provide dependable mechanical interlocking for industrial motor control, reversing starters and changeover 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...