Home page, see http://www.siemens.com/relays

Industry Mall, see http://www.siemens.com/product?3RR24

General data

Sizes

S00, S0, S2

• Are coordinated with the dimensions, connections and technical characteristics of the other devices in the SIRIUS modular system (contactors, soft starters, etc.)
• Permit the mounting of slim-line and compact load feeders in widths of 45 mm (S00 and S0) and 55 mm (S2)
• Simplify configuration

Dimensions in mm
(W x H x D)

• Screw terminals

S00: 45 x 79 x 80,
S0: 45 x 87 x 91,
S2: 55 x 99 x 112

• Spring-type terminals

S00: 45 x 90 x 80,
S0: 45 x 109 x 92,
S2: 55 x 99 x 112

Current range

S00: 1.6 ... 16 A

S0: 4 ... 40 A

S2: 8 ... 80 A

• Is adapted to the other devices in the SIRIUS modular system
• Just a single version per size with a wide setting range enables easy configuration

Permissible ambient operating temperature:

-25 ... +60 °C

• Suitable for applications in the control cabinet, worldwide

Monitoring functions

Current overshoot

? (3-phase)

• Provides optimum inverse-time delayed protection of loads against excessive temperature rises due to overload
• Enables detection of filter blockages or pumping against closed gate valves
• Enables drawing conclusions about wear, poor lubrication or other maintenance-relevant phenomena

Current undershoot

? (3-phase)

• Enables detection of overload due to a slipping or torn belt
• Ensures protection of pumps against dry running
• Facilitates monitoring of the functions of resistive loads such as heaters
• Permits energy savings through monitoring of no-load operation

Apparent current monitoring

? (selectable)

• Precision current monitoring especially in a motor's rated and upper torque range

Active current monitoring

? (selectable)

• Optimum current monitoring over a motor's entire torque range through the patented combination of power factor and apparent current monitoring

Range monitoring

? (3-phase)

• Simultaneous monitoring of current overshoot and undershoot with a singe device

Phase failure, open circuit

? (3-phase)

• Minimizes heating of three-phase motors during phase failure through immediate disconnection
• Prevents operation of hoisting equipment with reduced load carrying capacity

Phase sequence monitoring

?
(selectable)

• Prevents starting of motors, pumps or compressors in the wrong direction of rotation

Internal ground-fault detection (residual current monitoring)

? (selectable)

• Provides optimum protection of loads against high-resistance short circuits or ground faults due to moisture, condensed water, damage to the insulation material, etc.
• Eliminates the need for additional special equipment.
• Saves space in the control cabinet
• Reduces wiring outlay and costs

Blocking current monitoring

? (selectable)

• Minimizes heating of three-phase motors when blocked during operation through immediate disconnection
• Minimizes mechanical loading of the system by acting as an electronic shear pin

Operating hours counter

? 

• Gives the time during which there was a measurable current in at least 2 current paths
• As an indicator for upcoming maintenance or replacement of machine and system components

Operating cycles counter

? 

• Is incremented by one each time a breaking operation is detected, in other words a transition from three-phase current flow to no measurable current flow
• As an indicator for upcoming maintenance or replacement of contact blocks

Features

RESET function

? 

• Allows manual or automatic resetting of the relay
• Resetting directly on the device, or by switching the control supply voltage off and on or via IO-Link (remote RESET)

ON-delay time

0 ... 999.9 s

• Enables motor starting without evaluation of the starting current
• Can be used for monitoring motors with lengthy start-up

Tripping delay time

0 … 999.9 s

• Permits brief threshold value violations during operation
• Prevents frequent warnings and disconnections with currents near the threshold values

Operating and display elements

Displays and buttons

• For setting the threshold values and delay times
• For selectable functions
• For quick and selective diagnostics
• Displays for permanent indication of measured values

Integrated contacts

1 CO contact, 1 semiconductor output (in SIO mode)

• Enable disconnection of the system or process when there is an irregularity
• Can be used to output signals

Design of load feeders

Short-circuit strength up to 100 kA at 690 V

(in conjunction with the corresponding fuses or the corresponding motor starter protector)

? 

• Provides optimum protection of the loads and operating personnel in the event of short circuits due to insulation faults or faulty switching operations

Electrical and mechanical matching to 3RT2 contactors

? 

• Simplifies configuration
• Reduces wiring outlay and costs
• Enables stand-alone installation as well as space-saving direct mounting

Spring-type terminals for main circuit (for S00, S0) and auxiliary circuits

? (optional)

• Enables fast connections
• Permits vibration-resistant connections
• Enables maintenance-free connections

Other features

Suitable for single- and three-phase loads

? 

• Enables the monitoring of single-phase systems through parallel infeed at the contactor or looping the current through the three phase connections

Wide setting ranges

? 

• Reduce the number of variants
• Minimize the configuration outlay and costs
• Minimize storage overheads, storage costs, tied-up capital

Power supply

24 V DC

• direct via IO-Link master or via an external auxiliary voltage independent of the IO-Link
• Minimizes the configuring outlay and costs

Type

A

3RT201
S00
3/4/5.5/7.5 kW

3RT202
S0
5.5/7.5/11/15/18.5 kW

3RT203
S2
18.5/22/30/37 kW

3RR2441

1.6 … 16

? 

With stand-alone installation support

With stand-alone installation support

3RR2442

4 … 40

With stand-alone installation support

? 

With stand-alone installation support

3RR2443

8 … 80

With stand-alone installation support

With stand-alone installation support

? 

3RR24 monitoring relay, digitally adjustable with IO-Link

3RR2

4

4

?

–

?

A

A

4

0

Size

S00

1

S0

2

S2

3

Connection type

Screw terminals

1

Spring-type terminals

2

Example

3RR2

4

4

1

–

1

A

A

4

0