Pressure switch MDR 3
• Switching capacity 7.5 (11) kW / 20 HP
• Available with overload relay
• Max. cut-out pressure 35 bar
• 3-pole (N.C.)
• Acc. to EN 60947
• UL / CSA-approval optional
• Available with scale
• Available with auxiliary switch
Accessory DPA-Board for MDR 3 (Use only with MDR-3..E/A and RU 3/400-SO; article-nr. 201557)
Installing the DPA - circuit board onto MDR 3, the pressure switch offers the following additional functions:
• Phase sequence control
• Phase failure detection
• Supervision of an external opener possible, e. g. Klixon
• supervision (clamp tension < 230 V)
• Undervoltage release
For all functions the neutral conductor is not necessary. In case of malfunction the pressure switch will be switched off. Only upon solving the malfunction, the pressure switch can be switched on again.
Field of application: place-variable compressors, building site-area etc.
Accessories Hourmeter kit MDR 3
The MDR 3 can be equipped or retrofitted with an operating hourmeter to monitor the pump and compressor running time.
The hourmeter is available as a kit. The kit consists of an operating hourmeter for either 230 V / 400 V
or with battery supplied and a perforated MDR 3 cover with or without ON/OFF lever.
Unloader valves / Delayed unloader valves
EV 3 / EV 3i
EV 3W / EV 3Wi
AEV 3W / AEV 3Wi
Cable glands MDR 3
PG 9 Z
PG .. G
PG .. V
PG .. Z
PG .. ZK
Wall-mounting bracket, 3-pole overload relay, undervoltage and shunt releases
SK R3 / ..
HI 3 - Auxiliary switch