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Customer Class File Number
Dwyer Instruments, LLC
102 Indiana Hwy 212
Michigan City
Indiana
United States
46360
 3231-02
SWITCHES - Automatic - Pressure Type
022541_0_000


Pressure switches, enclosed

Model(s)Current (A)Power (HP)Voltage (VAC)Voltage (VAC max)
Cat No 1637-0.25, Cat No 1637-1, Cat No 1637-3, Cat No 1637-6, Cat No 1637-127 120
3.5 240
1/3 240
Cat No 1822-0.5, Cat No 1822-1, Cat No 1822-2, Cat No 1822-5, Cat No 1822-10, Cat No 1822-20, Cat No 1822-40, Cat No 1822-805 120
3.5 240
1/4 240

Pressure switches, open

Model(s)Current (A)Power (HP)Voltage (VAC)Voltage (VAC max)
Cat No 1637-0.25LC, Cat No 1637-1L, Cat No 1637-3LC, Cat No 1637-6LC, Cat No 1637-12LC7 120
3.5 240
1/3 240

Pressure switches, enclosed

Model(s)Current (A)Pilot Duty (HP)Voltage (VAC)Voltage (VAC max)
Cat No 1821-0.5, Cat No 1821-1, Cat No 1821-2, Cat No 1821-52 120
1 240
25VA 240

Pressure switches, open

Model(s)Current (A)Pilot Duty (HP)Voltage (VAC)Voltage (VAC max)
Cat No 1821-0.5LC, Cat No 1821-1LC, Cat No 1821-2LC, Cat No 1821-5LC2 120
1 240
25VA 240

Model(s)Current (A)Power (HP)Voltage (VAC)Voltage (VAC max)
Cat No 1822-0.5LC, Cat No 1822-1LC, Cat No 1822-2LC, Cat No 1822-5LC, Cat No 1822-10LC, Cat No 1822-20LC, Cat No 1822-40LC, Cat No 1822-80LC5 120
3.5 240
1/4 240

Pressure switches, enclosed

Model(s)Current (A)Power (HP)Voltage (VAC max)
Cat No 1638-0, Cat No 1638-1, Cat No 1638-2, Cat No 1638-5, Cat No 1638-1015 120‑480
1/4250
1/8125
Cat No 1823-0, Cat No 1823-1, Cat No 1823-2, Cat No 1823-5, Cat No 1823-10, Cat No 1823-20, Cat No 1823-40, Cat No 1823-8015 120‑480
1/8125
1/4250

Pressure switches, open

Model(s)Current (A)Power (HP)Voltage (VAC max)
Cat No 1639-0, Cat No 1639-1, Cat No 1639-2, Cat No 1639-5, Cat No 1639-1015 120‑480
1/4250
1/8125
Cat No 1824-0, Cat No 1824-1, Cat No 1824-2, Cat No 1824-5, Cat No 1824-10, Cat No 1824-20, Cat No 1824-40, Cat No 1824-8015 120‑480
1/8125
1/4250

Model(s)Current (A)Power (HP)Voltage (VAC)
Cat No 1638, Cat No163910 125/250/480
1/8125
1/4250

Model(s)Current (A)Voltage (VAC)Voltage (VDC)
Cat No 1638, Cat No 1639, Cat No 1823, Cat No 18241125
0.1 (Resistive) 12

Air pressure/vacuum and gas pressure switches

Model(s)Current (A max)Power (HP max)Voltage (VAC max)Voltage (VDC max)
Series 190015 120‑480
1/8125
1/4250
1 125
1/4 12

Models with -000 suffix rated 10A, 240V ac res.
1900 Series models with suffix -000, rated 10A, 240V ac resistive;
1900 series models with suffix -x3x, rated 1A at 125Vac; 0.1A at 12Vdc, resistive.

Photohelic switch/gauge

Model(s)Enclosure TypeInput Frequency (Hz)Input Voltage (VAC)Output Current (A)Output Power (HP)Output Voltage (VAC)
Series A30001 or 250/6024, 120 or 240101/3120/240

  1. Open devices are certified for use in other equipment where the suitability of the combination is determined by CSA Group.
  2. Last two digits of the Series 1900 number may be 10 to 96 denoting various mechanical features, type of operating fluid, enclosed or open etc.
  3. Series 1900 suffix numbers -000, -00, -0, -1, -5, -10, -20 denote operating pressure range of switch.
  4. Series 1900 models (not for general use) are Certified for use in other equipment where the suitability of the combination is determined by CSA Group.
  5. The screw terminals are intended for wiring with copper conductors only. The suitability of aluminum conductors shall be determined in the end use application. Switches intended for field wiring in the end use application shall be provided with a marking indicating "Use Copper Conductors Only".
  6. Equipment has only been evaluated for electrical safety. No evaluation of functional safety and performance characteristics (Pressure Rating) has been conducted.