Han Yellock Multiplier The Han Yellock system is a product series that retains the core functionality of other series but is significantly different from current size and shape formats. The Yellock connector series makes many new functions possible, with increased variability, simplified handling and maximized safety. The multiplier can be placed on the housing or the cable side and the bridge is visible from either side. The multiplier has bus bar functionaloty for up to 5 contacts.