ABB VEM4 mechanical and electrical interlock set including VM4 mechanical interlock and VE4 electrical interlock block for ABB AF, AFC and AFS contactors.
£26.10
The ABB VEM4 (1SBN030111R1000) is a high quality mechanical and electrical interlock set designed for the safe interlocking of two ABB AF series contactors mounted side by side. Combining both mechanical and electrical interlocking in one assembly, it prevents simultaneous energisation of both contactors, making it ideal for reversing motor starters and changeover applications.
Manufactured to ABB's renowned engineering standards, the VEM4 set includes a VM4 mechanical interlock unit, VE4 electrical interlock block and two BB4 fixing clips. The integrated electrical interlock connects the built-in normally closed contacts directly to both contactor coils using an A2-A2 connection, reducing wiring by up to 50% compared with conventional interlocking methods.
Designed specifically for ABB AF09 to AF38 and AFC09 to AFC38 contactors, the VEM4 provides a compact solution that installs without increasing the overall width of the contactor assembly, making it ideal for industrial automation panels, OEM machinery and motor control centres.
The ABB VEM4 combines mechanical and electrical interlocking to ensure two contactors cannot operate simultaneously. This dual protection helps safeguard motors, equipment and personnel while simplifying wiring and reducing installation time.
Its compact design makes it particularly suitable for reversing motor starters, changeover systems and industrial automation panels where reliability and space efficiency are essential.
| Phase | Three Phase |
|---|---|
| IP Rating | IP20 |
| Series | VEM4 |
| Part number | 1SBN030111R1000 |
| Product type | Mechanical and electrical interlock set |
| Accessory type | Contactor interlock set |
| Included components | VM4 mechanical interlock, VE4 electrical interlock block, 2 × BB4 fixing clips |
| Mounting method | Side-by-side between contactors |
| Compatible contactors | ABB AF09...AF38, AFC09...AFC38, AFS09...AFS38 |
| Compatible poles | 3-pole and 4-pole contactors |
| Auxiliary contacts | 2 NC |
| Additional width required | None |
| Rated insulation voltage | 690 V |
| Maximum operating voltage UL/CSA | 500 V AC/DC |
| Impulse withstand voltage | 6 kV |
| Maximum electrical switching frequency | 1200 cycles/hour |
| Maximum mechanical switching frequency | 1800 cycles/hour |
| Mechanical durability | approx. 5 million operations |
| Terminal type | Screw terminals |
| Tightening torque | 1.2 N·m |
| Protection rating | IP20 |
| Standards | IEC/EN 60947-4-1, IEC/EN 60947-5-1, UL 60947-1, UL 60947-4-1, CSA C22.2 |
| Dimensions (H × W × D) | approx. 43 × 25 × 31.6 mm |
| Weight | approx. 0.035 kg |
| EAN | 3471523130616 |
The VEM4 mechanically and electrically interlocks two compatible ABB contactors to prevent simultaneous operation.
The kit includes a VM4 mechanical interlock unit, a VE4 electrical interlock block and two BB4 fixing clips.
It is designed for ABB AF09...AF38 and AFC09...AFC38 contactors installed side by side.
No. The VEM4 installs without increasing the overall width of the contactor assembly.
The integrated VE4 electrical interlock reduces wiring by up to 50% compared with conventional interlocking arrangements while providing reliable protection.
ABB VEM mechanical and electrical interlock sets are trusted by electrical engineers, OEM manufacturers and panel builders for safe, dependable interlocking in industrial motor control and reversing applications.
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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...