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Pressure switch MDR 21

Technical specifications

Medium
Air, Water
Voltage type
Alternating current (AC) – single-phase
Type
Electro-mechanical
Voltage
≤ 250 V
Contact function
2 NC contacts
Gold-plated contacts
yes
Pressure adjustment
Pressure difference adjustment (standard)
Pressure range (bar)
≤ 11 Bar
Pressure coupling

G1/4" aluminium female thread (main pressure coupling G1/4" die-cast aluminium)

F4 1/4" aluminium female thread (main pressure coupling G1/4", 3 side outlets G1/4", pressure connector material = die-cast aluminium)

F4 3/8" aluminium female thread (main pressure coupling G3/8", 3 side outlets G1/4", pressure connector material = die-cast aluminium)

F4 1/2" aluminium female thread (main pressure coupling G1/2", 3 side outlets G1/4", pressure connector material = die-cast aluminium)

F4 1/4" NPT (main pressure coupling 1/4", 3 side outlets 1/4" NPT (National Pipe Thread) female thread, pressure connector material = die-cast aluminium)

Overload relay
not possible
Cable entry gland

mit 2x WN (Würgenippel)

(Zubehör PG 11 - 13)

Relief valve
without (accessory EV, AEV)
Mechanical On/Off (EA)
with/without On/Off
Rated frequency
50 Hz / 60 Hz
Rated operating current (Ie)

16 A

max. media temperature

80°C

Motor switching capacity
2,2 kW
Protection class
IP 44

Short Description

The high-performance pressure switch for the North American market - for switching motors (compressors and pumps), available in various versions and with optional accessories. The pressure switch MDR 21 has been certified by the KEMA KEUR Test and Certification Institute, and also acc. to UL and CSA standards. The lateral cable entry provides a larger connecting compartment.

Applications

  • Compressors
  • Mining & chemistry
  • Pumps
  • Agriculture

Certicates & Permits

  • CSA
  • KEMA
  • UL -Listed

At a glance

  • High-performance pressure switch for AC voltage
  • for compressors / for pumps
  • for North American market
  • Pressure connector material = die-cast aluminium
  • Operating hours counter (optional)
  • Motor switching capacity 2.2 kW
  • max. cut-out pressure 11 bar / 175 psi
  • 2-pole (NC)

Its robust and hard-wearing design ensures a long service life, also under high loads. The MDR-21 pressure switch is fitted as standard with the possibility for pressure difference adjustment. Two adjusting screws permit switching point and hysteresis to be adjusted, whereby the cut-out point is first adjusted via the main pressure spring, and then the cut-in point via the pressure difference setting. By selecting a pair of values for cut-in and cut-out pressures, an intersection point is determined in the diagram. If the point lies within the shaded area, this pair of values can be adjusted on the pressure switch. If the point lies outside the shaded area, this pair of values cannot be adjusted on the pressure switch. Two adjusting screws permit switching point and hysteresis to be adjusted, whereby the cut-in point is first adjusted via the main pressure spring, and then the cut-out point via the pressure difference setting.

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