Siemens 3RB20 Referenzhandbuch - Seite 7

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Features

Other features

Internal power supply

Variable adjustment of the trip clas-

ses

(The required trip class can be adjusted

by means of a rotary switch depending

on the current start-up condition.)

Overload warning

Analog output

1) The SIRIUS 3RU11 thermal overload relays use a bimetal contactor and

therefore do not require a control supply voltage.

Benefits

• Eliminates the need for configuration and connec-

ting an additional control circuit

• Reduces the number of variants

• Minimizes the configuring outlay and costs

• Minimizes storage overhead, storage costs, and

tied-up capital

• Indicates imminent tripping of the relay directly on

the device due to overload, phase unbalance or

phase failure

• Allows the imminent tripping of the relay to be

signaled

• Allows measures to be taken in time in the event of

continuous inverse-time delayed overloads

• Eliminates the need for an additional device

• Saves space in the control cabinet

• Reduces wiring outlay and costs

• Allows the output of an analog output signal for ac-

tuating moving-coil instruments, feeding program-

mable logic controllers or transfer to bus systems

• Eliminates the need for an additional measuring

transducer and signal converter

• Saves space in the control cabinet

• Reduces wiring outlay and costs

Overload Relays

3RU11

3RB20/3RB21

✔

(only 3RB21)

Siemens · 2011

General data

3RB22/3RB23

✔