Component / Circuit for variable resistance (0, 5K, 100K) at 110V and 1.5Amps @ 0Ohm
A couple of SPST relays will do what you want:







simulate this circuit &ndash; Schematic created using CircuitLab

By default (no relays activated), the 100k protection resistor is in the circuit.

Activate RLY1 to make a measurement.

Activate RLY2 to operate.