Carrier HR54AL323 Push Button Controller 30067439-890 What does the DPST NO

What does the DPST NO configuration mean for my wiring

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up to 60% glycol solutions

Does this heater element replace the S1-3500-4051

Carrier HR54AL323 Push Button Controller 30067439-890 What does the DPST NOThe Carrier HR54AL323 Push Button Controller is a critical wall mounted interface designed for precise HVAC blower motor control and multi stage equipment management. Engineered for both residential and commercial applications, this genuine OEM Carrier replacement part features a dual relay configuration, allowing it to function as either a sequencing relay for staged heating and cooling or a switching relay for standard on off operations. Its compact