Diagnosis and Protection Module, MDRC

Diagnosis and Protection Module, MDRC

Product code: DSM/S1.1
Enables quick diagnosis of the bus state and indicates telegram traffic via an LED. A bus fault is indicated by contacts. The DSM also suppresses transient overvoltages and interference voltage spikes on the bus and thus protects the connected devices.
Price (Excluding GST)


The diagnosis and protection module enables quick diagnostics of the bus state and indicates telegram traffic via an LED. A bus failure (U < Umin) can be signalled via the changeover contact. The DSM incorporates a suppressor diode which suppresses transient over voltages and interference voltage spikes on the KNX.

The DSM/S is a rail mounted modular installation device for installation in distribution boards. The connection to KNX is established using the bus connection terminal.

Technical Details


  • Rated Voltage: 21...31 V DC, via the bus
  • Rated Current: Max 8mA
  • Relay Contact Rating: NO 6 A at 230V AC (AC1/AC3) / 4 A at 24 V DC
  • Relay State: During normal operation the contact is open, closing when the voltage drops below 20 V
  • Protective Function: Suppressor Diode (43 V/1500 W @ 10/1000 µs pulse)



Brand ABB
Technology KNX
Mounting DIN Rail
Input voltage KNX Bus (29VDC)
IP rating IP20
Mounting Width 2MW
EAN 40 16779 65205
brand ABB

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