Quick Answer:The Four Way Plug Key is a plug-type selector with four gaps between brass blocks, each closed by a tapered brass plug with an insulated head, so several circuit branches can be opened or closed from one central hub.
Last updated: 18 October 2026
Key Features
Four gaps for four separate circuit branches.
High-conductivity brass blocks with precision bores.
Tapered brass plugs with insulated moulded heads.
Branches switched independently or together from a central hub.
Technical Specifications
Specification
Value
Type
Multi-point plug selector
Gaps
Four
Blocks
Heavy-duty, high-conductivity brass with precision bores
Each branch of the circuit is connected to its own block. Inserting a plug joins that branch to the hub, and removing it opens the branch, so components can be switched in turn when comparing EMFs, resistances or capacities.
Frequently Asked Questions
What is the Four Way Plug Key used for?
Selecting between up to four circuit branches, for example when comparing the EMFs of cells, resistances or capacities.
