ERS 4900, ERS 5900

Base Unit Select switch – used to designate the base unit in a stack. When set DOWN, this unit acts as the Base Unit for the stack. Only one switch in the stack must have the Base Unit Select in base position.

ERS 3500, ERS 3600, ERS 4800

Base Unit Select Switch – used to designate the Base Unit in a stack. When set to the RIGHT position, this unit acts as the Base Unit for the stack.