Siemens BETA Low-Voltage Circuit Protection

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BETA Monitoring
Monitoring of Electrical Values
5TT3 phase and phase sequence monitors
13/21 Siemens ET B1 · 10/2008
13
* You can order this quantity or a multiple thereof.
■ Dimensional drawings ■ Schematics
■ More information
Switching examples
5TT3 421 phase monitors
The phase monitor can be operated either in 1, 2 or 3-phase
operation.
5TT3 423 phase sequence monitors
Phase sequence monitors must always be connected in
three-phase.
5TT3 421 5TT3 423
5 43
64
4590
18
I2_10780
18
L2
NL1
L3
11 14
12
L2
L1
L3
14
12
11
5TT3 421 5TT3 423
14 12
11
L3 L2 L1
N
1412
11
L3 L2 L1
14 12
11
I2_10776a
L1 L2 L3 N
N L1
Single-phase operation
14 12
11
I2_10777a
L1 L2 L3 N
L1 L2 N
Two-phase operation
14 12
11
I2_10778
L1 L2 L3 N
L1 L3 L2N
Three-phase operation
I2_10779a
L1 L2 L3
K1
1412
11
M
L1 L2 L3 PE
© Siemens AG 2008