ABB 1SBN031005T1000 VM3 Mechanical Interlock Unit Mechanic Interlock for Switch

The ABB VM3 Mechanical Interlock Unit (SKU: 1SBN031005T1000) is a precision-engineered interlock accessory designed to prevent simultaneous engagement of two contactors or switching devices in industrial control panel applications. The VM3 ensures safe, mutually exclusive switching by mechanically linking two units, eliminating the risk of hazardous parallel operation. Compact and lightweight at just 0.002 kg, it integrates seamlessly into automation and motor control assemblies.

Technical Specifications

Certifications & Standards

• CE: Complies with European Union directives for electrical equipment safety and electromagnetic compatibility
• UKCA: UK Conformity Assessed marking for products placed on the Great Britain market
• RoHS: Restriction of Hazardous Substances — free from restricted hazardous materials per EU Directive 2011/65/EU
• REACH: Compliant with EU REACH regulation on chemicals safety (EC 1907/2006)
• CSA C22.2 NO. 60947-5-1-14: Certified to Canadian Standards Association standard for low-voltage switchgear and controlgear — control circuit devices and switching elements
• WEEE: Waste Electrical and Electronic Equipment compliant — supports responsible end-of-life recycling and disposal

Applications & Use Cases

• Reversing motor starter circuits requiring mutually exclusive forward/reverse contactor operation
• Star-delta starter assemblies in industrial motor control panels
• Any dual-contactor application in automation systems where simultaneous closure must be physically prevented
• Control panel assemblies in manufacturing, HVAC, and process automation environments