Dold Italia S.r.l.

Via Privata Passo Pordoi, 5
20139 Milano
MK 9003 ATEX

Thermistor Motor Protection Relay

MK 9003 ATEX


Auxiliary voltage

Approvals and Markings


  • 0055452
  • MK9003.12/10110 ATEX AC230V
Temperature monitoring of explosion protected Motors by „extended safety“ EX e EN 60079-7,... altro

Descrizione del prodotto

Temperature monitoring of explosion protected Motors by „extended safety“ EX e EN 60079-7, „pressure proof enclosure“ EX d EN 60079-1 or „overpressure enclosure“ Ex px in gas containing atmosphere as well as „protection by enclosures“ Ex t EN 60079-31 in dust containing atmosphere. The thermistor Motor protection relay protects Standard and Explosion proof Motor against overheating due to overload accoding to EN 60079-14 and EN 60079-0.

Specifiche tecniche

Width: 22,5 mm
Measuring range max.: > 3.1 kΩ
Auxiliary voltage: AC, DC
Classification: Thermistor-Motorschutz
Output contacts: 2 C/O contacts
Enclosure design: Switch cabinet
Type: MK 9003 ATEX

Vorteile / Kundennutzen

  • Reliable temperature monitoring of motors
  • Rapid fault location


  • According to EN 60947-5-1, EN 60947-8, EN 60079-14, EN 61508, EN 50495, EN 13849
  • Detection of
    - overtemperature
    - broken wire in sensor circuit
    - short circuit in sensor circuit
  • 1 input for 3 or 6 PTC-reistors
  • Functions as options or settable with DIP-switches:
    - automatic reset (fault is not stored)
    - manual reset (fault is stored)
    - manual reset only on start-up
    - manual reset on and also after start-up
  • No voltage safe manual reset
  • Closed circuit operation
  • LED indicators for
    - auxiliary supply
    - contact position
    - overtemperature, broken wire or short-circuit in sensor circuit
  • 2 changeover contacts
  • Button for reset function
  • Remote reset via terminals X1 / X2 (NO contact)
  • Optionally safe separation according to EN 61 140, EN 60 947-1, 6 kV/2 between:
    - auxiliary voltage and measuring circuit
    - auxiliary voltage and output contacts
    - measuring circuit and output contacts
    - the 2 changeover contacts (only with 2 changeover contacts)
  • Width 22.5 mm