• Siemens 5TT3 Insulation Monitors for IT Systems (AC/DC)
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Siemens 5TT3 Insulation Monitors for IT Systems (AC/DC)

Siemens 5TT3 Insulation Monitors for IT Systems (AC/DC)

Siemens 5TT3 insulation monitors protect persons and prevent fire in non-grounded (IT) systems by monitoring insulation resistance.

Key features

  • 5TT3470 for 3-phase and AC systems 0-500 V AC, alarm value 5-100 kOhm
  • 5TT3471 for direct-voltage systems 12-280 V DC, alarm value 5-200 kOhm
  • 2 CO contacts, infinitely variable alarm value setting
  • Degree of protection IP20 terminals / IP40 enclosure

Specifications

Series 5TT3
Contacts 2 CO
Width 2 MW
Terminals Screw (PZ 2)
Mounting DIN rail
Ambient temperature -20 to +60 °C
Source Siemens Catalog LV 10 · 2026, p. 878
5TT3470 System: AC IT systems | Measuring voltage: 0-500 V AC | Measuring range: 5-100 kOhm | Supply: 230 V AC
5TT3471 System: DC IT systems | Measuring voltage: 12-280 V DC | Measuring range: 5-200 kOhm | Supply: 12-280 V DC (from system)
Monitoring RelaysSiemens
2 product codes available in this family
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Siemens 5TT3 Insulation Monitors for IT Systems (AC/DC)

Brand Siemens·Monitoring Relays

Available part numbers (2)

5TT3470, 5TT3471

How to order

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Product codes & specifications
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Product codeSpec
5TT3470System: AC IT systems | Measuring voltage: 0-500 V AC | Measuring range: 5-100 kOhm | Supply: 230 V AC
5TT3471System: DC IT systems | Measuring voltage: 12-280 V DC | Measuring range: 5-200 kOhm | Supply: 12-280 V DC (from system)

Need a different model, or a part not listed here? Send us your parts list →

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