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Manual Reset Pressure Switch 1900-5-MR

Manual Reset Pressure Switch


The Dwyer Model 1900-5-MR manual reset pressure switch is designed to monitor duct static and shut down the blower when excess pressure occurs. The switch must be manually reset before the system can start again. Switch contacts are SPDT with solder-type connections. The Model 1900-5-MR measures static pressure only, not differential pressure. Order the A-399 duct pressure kit separately.


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QtyModelDescriptionIn StockList PriceInternet Price
1900-1-MR DIFF PRESS SW, ADJUST, 0.40-1.60" WCIn Stock301.00168.56
1900-10-MR DIFF PRESS SW, ADJUST, 3.00-11.75" WCIn Stock301.00168.56
1900-5-MR DIFF PRESS SW, ADJUST, 1.40-5.50" WCINFO294.00164.64
1900-5-MR-C DIFF PRESS SW, ADJUST, 1.40-5.50" WCINFO255.78143.24


No accessories found

Supply Voltage: Not required

Contact Type :SPDT

Contact Rating :15A resistive, 120-480 VAC, 60 Hz

 : 1/8 HP @125 VAC, 1/4 HP @250 VAC

Setpoint (SP): Screw adjustment in 3 ranges (See ordering)

Differential Progressive :by SP from 0.04″ to 0.5″ WC (See ordering)

Repeatability :± 3% over full range

Reset Manual: button reset

Visual Indication :None

Sensor Type :Silicone Diaphragm

Operating Pressure Range: Range dependant (see ordering)

Overpressure: (Burst) 276″WC (68.9 kPa)

Max Operating Pressure: (Proof) 45″WC (11.2kPa)

Operating Temperature :-30° to 180℉ (-34 to 82℃)

Operating Humidity :10 to 90% Non-condensing

Wetted Parts: Silicone

Media Compatibility: Inert dry air

Process Connection: 1/8 FNPT

Wiring Terminations :3 Screw terminals, 22-18 AWG

Mounting Vertical :w/ 2 hole bracket 0.187 (0.5cm)

Enclosure Rating :Zink-plated steel, NEMA 1

Dimensions:3.5″dia x 2.34″ d, (8.89 x 5.9 cm)

Weight :1.3 lbs (0.59 kg)

Approvals: CE, CSA, FM, UL

Warranty :1 year