Resideo AP5208-30/U Airswitch Product, Style E121

The AP5208-30 is an air pressure switch from Resideo (Honeywell Home), style E121, 1/4 in barbed connection.

A pressure switch proves airflow by measuring it rather than by being pushed. It senses the pressure difference a running fan creates and makes contact when that difference appears — which works in ducts where a sail would foul, and at differentials far too small to move a vane.

Switching differential runs from about 0.02 in w.c. at the minimum set point to roughly 0.80 in w.c. at the maximum, so it covers everything from proving a small exhaust fan to confirming a blower under load.

Gold flash contacts carry pilot duty down to 10 milliamps, which matters when the load is a control input rather than a coil.

• Brand: Resideo (Honeywell Home)
• Manufacturer Part #: AP5208-30/U
• Type: Air pressure switch
• Connection: 1/4 in. Barbed
• Electrical: 278 Va @ 24Vac; 300Va @ 120 to 277Vac
• Pilot duty: 10 Milliamps @ 5Vdc; Gold Flash Contacts; 15 Amps resistive to 277Vac
• Differential: Switching Differential:.02"±.01" wc @ minimum set point to approximately.80" wc @ maximum set point
• Operating range: -40 F to +190 F
• UPC: 085267225359
• Category: Pressure Switches

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