Siemens BETA Low-Voltage Circuit Protection

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BETA Monitoring

Monitoring of Plants and Devices

5

TT3 171 line circuit relays

14/19

Siemens ET B1 · 10/2008

14

■

Dimensional drawings

■

Schematics

Switching example

If the line circuit relay does not respond to a load, it must be

connected with a 5TG8 222 base load resistor. Devices in active

standby operation may impair the function of the line circuit relay.

5

TT3 171

L N

5 43

64

18

I2_10775a

45

90

L N

L1

N

PTC

i

I2_07036b

230

V AC

Elec-

tronic

© Siemens AG 2008