ABB vem4 mechanical and electrical interlock set

Why Choose the ABB VEM4 Mechanical and Electrical Interlock Set?

The ABB VEM4 is a compact and highly reliable mechanical and electrical interlock set designed for use with ABB AF, AFC and AFS contactors in industrial motor control and automation systems. Identified by part number 1SBN030111R1000, this accessory forms part of the trusted ABB VEM interlock series, engineered to prevent simultaneous operation of adjacent contactors in reversing and changeover applications.

The VEM4 is specifically designed for the side-by-side interlocking of two 3-pole or 4-pole ABB contactors without adding extra panel width. The set combines a VM4 mechanical interlock unit with a VE4 electrical interlock block featuring integrated A2-A2 coil connection wiring, helping reduce installation time and simplifying panel assembly.

By connecting the built-in 2 NC electrical interlocking contacts directly to the contactor coils, the VEM4 can reduce wiring requirements by up to 50% compared with conventional electrical interlocking arrangements. Its compact design and dependable operation make it ideal for industrial reversing starters, HVAC systems and automation machinery.

Key Advantages

• Reliable mechanical and electrical interlocking of adjacent contactors.
• Prevents simultaneous contactor operation for improved safety.
• No additional installation width required.
• Integrated electrical interlock block with A2-A2 connection.
• Reduces control wiring by up to 50%.
• Compatible with ABB AF, AFC and AFS contactor ranges.
• Compact lightweight construction for industrial control panels.

Key Features

• ABB VEM4 mechanical and electrical interlock set.
• Includes VM4 mechanical interlock unit.
• Includes VE4 electrical interlock block.
• Supplied with 2 fixing clips (BB4).
• Integrated 2 NC electrical interlocking contacts.
• Designed for side-by-side contactor interlocking.
• Prevents simultaneous contactor operation.
• Compact installation without added panel width.
• Suitable for industrial motor control systems.
• High mechanical durability and long service life.

Technical Specifications

• Manufacturer: ABB
• 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

Reliable Interlocking for Reversing Motor Starters

Mechanical and electrical interlock units are widely used in reversing motor starters and changeover circuits to prevent two contactors from closing simultaneously. This protects motors, power circuits and connected equipment from electrical faults caused by opposing outputs or unintended parallel operation.

The ABB VEM4 provides a compact and highly efficient solution for industrial automation engineers, machine builders and panel manufacturers requiring dependable interlocking functionality together with simplified control wiring inside modern control cabinets.

Typical Applications

• Reversing motor starters.
• Forward and reverse motor control systems.
• HVAC compressor and fan interlocking.
• Industrial machinery and automation systems.
• Conveyor and material handling systems.
• Changeover and transfer switching applications.

Trusted by Industrial Control Engineers Worldwide

ABB VEM4 interlock sets are widely used by automation engineers and panel builders to provide safe, dependable contactor interlocking and simplified wiring in industrial motor control systems.