As I recall, a flip-flop took two 2PDT relays and a binary adder took two 4PDT
relays in my brute-force logic circuit.
For example, a 4PDT
switch could support four-wire or Kelvin-connected, Ohms measurement on two components.
Offering dual and quad lit displays in various SPST to 4PDT
switch functions, the 644-2100 series pushbutton switch can replace up to 4 individual switches with multifunction capability.
The RoHS-compliant devices offer coil voltages ranging from 6 VDC to 220 VDC and 6 VAC to 240 VAC, and contact arrangements from SPST to 4PDT
The PR2 Series uses flat pin, "ice-cube-style" general-purpose relays in 10A DPDT and a 5A per pole, 4PDT
Available with DPDT or 4PDT
switch function, it offers both momentary and latching styles.