Nordyne 626410R Limit Switch 321702-401 it is likely switching 3-phase

it is likely switching 3-phase power or multiple line-voltage legs

Durable Construction: Stainless steel 1/4" NPT fitting resists corrosion and handles high-side refrigerant pressures

the unit is integrated into a vented

This unit features a robust 32-inch armored cable to protect the internal wiring from high-temperature exposure and mechanical wear

Nordyne 626410R Limit Switch 321702-401 it is likely switching 3-phaseThe Nordyne 626410R limit switch is a critical safety component designed for precise thermal regulation within HVAC systems. Operating with a 115 155F temperature range, this L155 40F fixed setting control ensures the burner circuit opens if the heat exchanger exceeds 155F, preventing equipment damage and hazardous conditions. As the 626410R direct replacement for 626410, this high limit sensor maintains the original equipment manufacturer (OEM)