RTA421 Limit switch

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Specs at a glance

Input

1 x analog (U, I)
Output

1 x transmitter power supply
Output

1 x transmitter power supply
Display

LCD 6 mm (0.24")
4-digit
Bargraph
Power Supply

Not defined

See all specifications

Field of application

The RTA421 contactor monitors industrial processes for safe operation. The unit analyzes current (0/4...20 mA) and voltage signals (0/2...10 V) and switches two independent output relays if the values either exceed or undercut the preset alarm set points. On the display both limit values are indicated in parallel. The bar graph informs on the connected signal at any time. Applications include pump control in the waste water industry. Level measurement in silos can be economically achieved.

Plant and machine construction
Panel builders
Process monitoring
Process control

Benefits

2 relays for set point monitoring (with SPDT contacts)
Loop power supply for connected sensors
LC display for alarm set points and bar graph
Compact housing
Front end setup using 3 push buttons
DIN rail mounting, 45 mm housing width

Predecessor

HTA182
HTA380

HTA423
XT170

Measuring principle

Contacter
Function

Display
Power
Switch
Certification

-
Input

1 x analog (U, I)
Output

1 x transmitter power supply
Relay output

2 x changeover contacts
Auxiliary power supply / Loop power supply

196...250 V AC
97...127 V AC
20...250 V AC/DC
Dimensions (wxhxd)

45 x 107.8 x 112 mm
(1.77" x 4.24" x 4.41")
Operation

3 keys
Display

LCD 6 mm (0.24")
4-digit
Bargraph

Measuring principle

Process transmitter
Measuring principle

Contacter
Function

Display
Power
Switch
Loop power supply

196...250 V AC
97...127 V AC
20...250 V AC/DC
Power Supply

Not defined
Input

1 x analog (U, I)
Output

1 x transmitter power supply
Software functions

Not defined
Certificates

-
SIL

Not defined
Display

LCD 6 mm (0.24")
4-digit
Bargraph
Interface

Not defined
Dimensions (WxHxD)

45 x 107.8 x 112 mm (1.77" x 4.24" x 4.41")

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Spare parts

Search spare parts by number in drawing

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Terminals
Terminal strip relay 2 3 pole

Terminals

Drawing number

Order code

3

51000777
Terminals
Terminal strip relay 1 3 pole

Terminals

Drawing number

Order code

4

51000778
Terminals
Supply terminal 4 pole

Terminals

Drawing number

Order code

1

51000780
Terminals
Terminal plug-in anal.input no loop pow.

Terminals

Drawing number

Order code

2

51001339
Terminals
Terminal plug-in anal.input w.loop power

Terminals

Drawing number

Order code

2

51001340
further parts
Set, 10x fixing lever housing

further parts

Order code

71402350
Housing/housing accessories
Housing cpl. (version with display) without terminal strip and display PCB

Housing/housing accessories

Drawing number

Order code

5

RTA421X-HB

Often bought together

5 products

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RN42 active barrier, wide range power supply

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E

X

Products

System products

1-channel wide range supply and active barrier for safe isolation of 4 to 20 mA standard signal circuits

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Input

0/4…20 mA / HART
feeding/not feeding

Output

0/4…20 mA / HART
active/passive

Power Supply

20...250 V AC/DC
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RIA45
Process meter with control unit

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Products

System products

Multifunctional panel mounted process meter for monitoring and indication of analog measured values

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Input

2 x universal (U, I, R, RTD, TC)

Output

1 x loop power supply

Output

2 x analogue output (I, U)
1 x loop power supply

Display

Multicolor backlight LCD
White/black/yellow
Bargraph
Unit
TAG
Alarm warning in plain text

Power Supply

20...250V AC/DC
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RMA42
Process transmitter with control unit

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X

Products

System products

Universal transmitter, loop power supply, barrier and limit switch in one device!

Show specs at a glance Hide details

Input

2 x universal (current, voltage, R, RTD, TC, resistance)

Output

2 x Analog (current, voltage)

Output

2 x Analog (current, voltage)

Display

LCD
7 segment
Multicolour
Bargraph
TAG unit
Colour change in case of failure

Power Supply

Not defined
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HAW562
Surge arrester

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L

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X

Products

System products

Surge arrester for DIN rail according to IEC 60715

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RIA15
Loop-powered indicator for 4 to 20 mA or HART signals

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L

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X

Products

System products

For the indication of the 4 to 20 mA signal or the HART® values in the field or in the panel!

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Input

1 x analogue 4...20 mA/HART®

Output

Not defined

Display

LCD 17 mm (0.67")
5-digit
7-segment bargraph
Plain text display for unit/TAG
Activatable backlight

Power Supply

Loop powered
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F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
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RTA421Limit switch

Contactor with loop power supply for monitoring current or voltage signals

Specs at a glance

Input

Output

Output

Display

Power Supply

Field of application

Benefits

Predecessor

Measuring principle

Function

Certification

Input

Output

Relay output

Auxiliary power supply / Loop power supply

Dimensions (wxhxd)

Operation

Display

Measuring principle

Measuring principle

Function

Loop power supply

Power Supply

Input

Output

Software functions

Certificates

SIL

Display

Interface

Dimensions (WxHxD)

Terminal strip relay 2 3 pole

Terminal strip relay 1 3 pole

Supply terminal 4 pole

Terminal plug-in anal.input no loop pow.

Terminal plug-in anal.input w.loop power

Set, 10x fixing lever housing

Housing cpl. (version with display) without terminal strip and display PCB

RN42 active barrier, wide range power supply

Input

Output

Power Supply

RIA45Process meter with control unit

Input

Output

Output

Display

Power Supply

RMA42Process transmitter with control unit

Input

Output

Output

Display

Power Supply

HAW562 Surge arrester

RIA15 Loop-powered indicator for 4 to 20 mA or HART signals

Input

Output

Display

Power Supply

Choose from our suggested options

Individual configuration

Often bought together

RTA421
Limit switch

RIA45
Process meter with control unit

RMA42
Process transmitter with control unit

HAW562
Surge arrester

RIA15
Loop-powered indicator for 4 to 20 mA or HART signals