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EDM EDMO MPL 503 S 1.12 SPC Air Pressure Switch/Normally Open 42 Knots Adjustable. P3336621EDM-MPL503 https://cdnimages.opentip.com/full/EDM/EDM-MPL503.jpg EDMO MPL 503 S 1.12 SPC Air Pressure Switch/Normally Open 42 Knots Adjustable. Manufacturer Part Number: MPL-503-S-1.12-SPCMPL 500 Series switches offer pressure, vacuum, and differential sensors, sensitive to as low as 0.05 in/H 2 O. Air Pressure Switch that activates between 120-125 knots. Their accuracy and reliability offer the designer an excellent general purpose low pressure to electric interface for monitoring and control applications. Miniature size and low cost make the 500 Series ideal for OEM applications.Electrical:Diaphragm material can be selected for the operating medium, temperature range, and other parametersActuation point can be moderately adjusted by the designerDesigned for low current and logic applications ( LED indicators, solid state relays)10 to 20mA loads ensure reliable switching (Varistor or R-C snubber recommended for inductive loads)Heavier loads require the use of interface devices such as solid state relaysFeatures an integral triacTerminals:NEMA 0.020\" x 0.187\" male tabs are standardLow-profile terminals for 18-22 gage wireOptional bifurcated terminals accept 0.020\" x 0.187\" or 0.020\" x 0.110\" female quick disconnectsTerminals are available for printed circuit board mounting.Custom applications requiring elongated terminals, tinning, and custom wiring can also be accommodated.Leakage:The diaphragm functions as both sensor and sealDynamic applications, the diaphragm provides an adequate sealStatic applications, a secondary internal gasket will ensure a near bubble tight sealProduct CodesMfr Part No:MPL-503-S-1.12-SPCCSA:50215ECCN:7A994SCHEDULE B CODE:8536.50.9040UL:E70125 3336621 0.0500lbs 0.00 0.00 0.00
EDMO
56.4000 2027-01-06 168 In Stock
customer review - by , October 10, 2025
5/ 5stars
Mount a little off had to drill holes
customer review - by , May 5, 2025
5/ 5stars
Got my furnace running again and it seems to by functioning well.
customer review - by , October 10, 2023
5/ 5stars
Could not find the manufacturer part but this one has been working perfectly
customer review - by , April 4, 2022
5/ 5stars
great replacement part and got the heat working again
customer review - by , March 3, 2022
5/ 5stars
Works great. Bracket was a little different but nothing I couldn't handle

EDMO MPL-503-S-1.12-SPC Air Pressure Switch/Normally Open, 42 Knots, Adjustable., Price/EA

stars Rating 5 | 5 reviews
Brand EDMO
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SKU: EDM-MPL503
Price:
$56.40Free shipping on orders over $359.00 on select EDM- items. Details
Quantity:
168 In Stock
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Product Description

Price is for EA.

Manufacturer Part Number: MPL-503-S-1.12-SPC

MPL 500 Series switches offer pressure, vacuum, and differential sensors, sensitive to as low as 0.05 in/H 2 O. Air Pressure Switch that activates between 120-125 knots. Their accuracy and reliability offer the designer an excellent general purpose low pressure to electric interface for monitoring and control applications. Miniature size and low cost make the 500 Series ideal for OEM applications.

Electrical:
  • Diaphragm material can be selected for the operating medium, temperature range, and other parameters
  • Actuation point can be moderately adjusted by the designer
  • Designed for low current and logic applications ( LED indicators, solid state relays)
  • 10 to 20mA loads ensure reliable switching (Varistor or R-C snubber recommended for inductive loads)
  • Heavier loads require the use of interface devices such as solid state relays
  • Features an integral triac
Terminals:
  • NEMA 0.020" x 0.187" male tabs are standard
  • Low-profile terminals for 18-22 gage wire
  • Optional bifurcated terminals accept 0.020" x 0.187" or 0.020" x 0.110" female quick disconnects
  • Terminals are available for printed circuit board mounting.
  • Custom applications requiring elongated terminals, tinning, and custom wiring can also be accommodated.
Leakage:
  • The diaphragm functions as both sensor and seal
  • Dynamic applications, the diaphragm provides an adequate seal
  • Static applications, a secondary internal gasket will ensure a near bubble tight seal


warning tips WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.

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Customer Reviews
5 out of 5
5 stars
5
4 stars
0
3 stars
0
2 stars
0
1 stars
0
By Gabriel Reale
Date: October 19, 2025
Mount a little off had to drill holes
Rating: 5 stars [5 of 5 Stars!]
By J. G.
Date: May 16, 2025
Got my furnace running again and it seems to by functioning well.
Rating: 5 stars [5 of 5 Stars!]
By A Customer
Date: October 08, 2023
Could not find the manufacturer part but this one has been working perfectly
Rating: 5 stars [5 of 5 Stars!]
By hound dawg
Date: April 01, 2022
great replacement part and got the heat working again
Rating: 5 stars [5 of 5 Stars!]
By Kenny Roberts
Date: March 31, 2022
Works great. Bracket was a little different but nothing I couldn't handle
Rating: 5 stars [5 of 5 Stars!]
Items 1 - 5 of 5 reviews
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