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- Model RTA421 - Limit Switch
Model RTA421 -Limit Switch
Contactor with loop power supply for monitoring current or voltage signals. 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.
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2 relays for set point monitoring (with SPDT contacts)
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Loop power supply for connected sensors
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LC display for alarm set points and bar graph
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Compact housing
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Front end setup using 3 push buttons
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DIN rail mounting, 45 mm housing width
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Plant and machine construction
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Panel builders
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Process monitoring
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Process control
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Measuring principle
Contacter
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Function
Display
Power
Switch -
Certification
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Input
1 x analog (U, I)
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Output
1 x transmitter power supply
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Relay output
2 x changeover contacts
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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
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Display
LCD 6 mm (0.24")
4-digit
Bargraph
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Measuring principle
Contacter
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Measuring principle
Contacter
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Function
Display
Power
Switch -
Loop power supply
196...250 V AC
97...127 V AC
20...250 V AC/DC -
Power Supply
Not defined
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Input
1 x analog (U, I)
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Output
1 x transmitter power supply
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Software functions
Not defined
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Certificates
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SIL
Not defined
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Display
LCD 6 mm (0.24")
4-digit
Bargraph -
Interface
Not defined
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Dimensions (WxHxD)
45 x 107.8 x 112 mm (1.77" x 4.24" x 4.41")