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Operating at 575 volts
it utilizes a dual-voltage architecture (120V for the igniter load and 24V for the control logic) to ensure reliable flame rectification and safe operation
if your system uses the 198212CA or requires a PT3000 ohm sensor
Bypassing a safety switch is never recommended for permanent operation
Trane SWT1257 Limit Switch 321894-709 Operating at 575 voltsThe Trane SWT1257 Limit Switch is a critical safety component designed for heavy duty furnace high limit switch applications. This genuine OEM Trane part (also referenced as SWT01257) functions as a normally closed thermal protector that triggers an automatic shutdown if heat exchanger temperatures exceed safe operating parameters. Rated with an L160 30F fixed set point, the switch is engineered to open at 160F and features an auto reset mechanism