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Overview

Features

General data

Sizes

Seamless current range

Protection functions

Tripping in the event of overload

Tripping in the event of phase

unbalance

Tripping in the event of phase failure

Protection of single-phase loads

Tripping in the event of overheating

integrated thermistor motor

protection function

Tripping in the event of a ground fault

internal ground-fault detection

(activatable)

Features

RESET function

Remote RESET function

TEST function for auxiliary contacts

TEST function for electronics

Status display

Large current adjustment button

Integrated auxiliary contacts

(1 NO + 1 NC)

1) Motor currents up to 820 A can be recorded and evaluated by a current

measuring module, e. g. 3RB29 06-2BG1 (0.3 ... 3 A), in combination with

a 3UF18 68-3GA00 (820 A/1 A) series transformer.

2) The SIRIUS 3RN thermistor motor protection devices can be used to pro-

vide additional temperature-dependent protection.

Benefits

• Are coordinated with the dimensions, connections

and technical characteristics of the other devices

in the SIRIUS modular system (contactors, soft

starters, ...)

• Permit the mounting of slim and compact load fee-

ders in widths of 45 mm (S00), 45 mm (S0), 55 mm

(S2), 70 mm (S3), 120 mm (S6) and 145 mm

(S10/S12)

• Simplify configuration

• Allows easy and consistent configuration with one

series of overload relays (for small to large loads)

• Provides optimum inverse-time delayed protection

of loads against excessive temperature rises due

to overload

• Provides optimum inverse-time delayed protection

of loads against excessive temperature rises due

to phase unbalance

• Minimizes heating of induction motors during pha-

se failure

• Enables the protection of single-phase loads

• Provides optimum temperature-dependent pro-

tection of loads against excessive temperature ri-

ses, e. g. for stator-critical motors or in the event of

insufficient coolant flow, contamination of the mo-

tor surface or for long starting or braking opera-

tions

• Eliminates the need for additional special

equipment

• Saves space in the control cabinet

• Reduces wiring outlay and costs

• Provides optimum protection of loads against

high-resistance short-circuits or ground faults due

to moisture, condensed water, damage to the in-

sulation material, etc.

• Eliminates the need for additional special

equipment.

• Saves space in the control cabinet

• Reduces wiring outlay and costs

• Allows manual or automatic resetting of the relay

• Allows the remote resetting of the relay

• Allows easy checking of the function and wiring

• Allows checking of the electronics

• Displays the current operating state

• Makes it easier to set the relay exactly to the cor-

rect current value

• Allows the load to be switched off if necessary

• Can be used to output signals

Overload Relays

3RU11

3RB20/3RB21

S00 ...S3

S00 ... S12

0.11 ... 100 A

0.1 ... 630 A

✔

(✔)

✔

(only 3RB21)

✔

(by means of sepa-

(only 3RB21 with

rate module)

24 V DC)

✔

Siemens · 2011

General data

3RB22/3RB23

S00 ... S12

0.3 ... 630 A

(... 820 A)

✔

(2 ×)