• Siemens 5TT3 Fuse, Phase and Phase Sequence Monitors
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Siemens 5TT3 Fuse, Phase and Phase Sequence Monitors

Siemens 5TT3 Fuse, Phase and Phase Sequence Monitors

Siemens 5TT3 monitors supervise low-voltage fuses, the presence of three phase voltages and the phase sequence in three-phase systems.

Key features

  • 5TT3170 fuse monitor for all low-voltage fuse systems, also for disconnected loads
  • 5TT3421 phase monitor with 3 green LEDs for 3 phases
  • 5TT3423 phase sequence monitor, LED lights for right-rotating field
  • Rated operational voltage 250 V AC, 4 A contacts

Specifications

Series 5TT3
Rated operational voltage 250 V AC
Rated operational current 4 A
Standards IEC 60255, DIN VDE 0435
Terminals Screw (PZ 1)
Mounting DIN rail
Source Siemens Catalog LV 10 · 2026, p. 875-877
5TT3421 Device: Phase monitor, 3 green LEDs | Control voltage: 230/400 V AC | Contacts: 1 CO | Width: 1 MW
5TT3423 Device: Phase sequence monitor, 1 green LED | Control voltage: 400 V AC | Contacts: 1 CO | Width: 1 MW
Monitoring RelaysSiemens
2 product codes available in this family
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Siemens 5TT3 Fuse, Phase and Phase Sequence Monitors

Brand Siemens·Monitoring Relays

Available part numbers (2)

5TT3421, 5TT3423

How to order

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Product codes & specifications
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Product codeSpec
5TT3421Device: Phase monitor, 3 green LEDs | Control voltage: 230/400 V AC | Contacts: 1 CO | Width: 1 MW
5TT3423Device: Phase sequence monitor, 1 green LED | Control voltage: 400 V AC | Contacts: 1 CO | Width: 1 MW

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