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

вњ“ (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

вњ“ (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

вњ“ (selectable)

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

Active current monitoring

вњ“ (selectable)

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

Range monitoring

вњ“ (3-phase)

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

Phase failure, open circuit

вњ“ (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

вњ“
(selectable)

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

Internal ground-fault detection (residual current monitoring)

вњ“ (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

вњ“ (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

вњ“ 

• 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

вњ“ 

• 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

вњ“ 

• Allows manual or automatic resetting of the relay
• Resetting directly on the device, 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 вЂ¦ 999.9 s

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

Operating and indicating 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)

вњ“ 

• 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

вњ“ 

• 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

вњ“ (optional)

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

Other features

Suitable for single- and three-phase loads

вњ“ 

• 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

вњ“ 

• 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 вЂ¦ 16

вњ“ 

With stand-alone installation support

With stand-alone installation support

3RR2442

4 вЂ¦ 40

With stand-alone installation support

вњ“ 

With stand-alone installation support

3RR2443

8 вЂ¦ 80

With stand-alone installation support

With stand-alone installation support

вњ“ 

3RR24 monitoring relay, digitally adjustable with IO-Link

3RR2

4

4

вќ’

–

вќ’

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