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VME420 |
 Digital Voltage and Frequency Relay for AC/DC Systems
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The VME420 is a powerful, all-in-one unit for single-phase AC and DC systems for 0 to 300 V monitoring over/undervoltage and over/underfrequency. Values are displayed and changed via a digital seven-segment display and menu. Values are displayed as true RMS values, and many different delays can be set.
This unit utilizes an auxiliary supply voltage to power itself. For the version that is powered off of the monitored line, please see the VME421H.
Note: for the three-phase AC version, please see the VMD420.
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VMD420 |
Digital Voltage, Frequency, and Phase Relay for Three-Phase AC Systems
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The VMD420 is a powerful, all-in-one unit for three-phase (three or four wire) AC systems for 0 to 500 V monitoring over/undervoltage, over/underfrequency, asymmetry, phase sequence, and phase failure. Values are displayed and changed via a digital seven-segment display and menu. Values are displayed as true RMS values, and many different delays can be set.
This unit utilizes an auxiliary supply voltage to power itself. For the version that is powered off of the monitored line, please see the VMD421H.
For the single-phase AC and DC version, please see the VME420.
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SUD140 |
Undervoltage Relay for Three-Phase (4w) Systems
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The SUD140 series monitors for undervoltage in three-phase AC systems with neutral. The values for voltage, hysteresis, and response delay are set via potentiometers. An external supply voltage is not required.
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SUD142 |
Undervoltage Relay for Three-Phase (3w) Systems
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The SUD142 series monitors for undervoltage in three-phase AC systems without neutral. The values for voltage, hysteresis, and response delay are set via potentiometers. An external supply voltage is not required.
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SUD472 |
Voltage Relay for Three-Phase (3w) Systems
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The SUD472 series monitors for undervoltage or overvoltage in three-phase AC systems without neutral. The response values are set via potentiometers. Power is supplied to the device via a combination of a supply voltage from the system being monitored and an internal energy backup system.
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SUD473 |
Voltage Relay for Three-Phase (4w) Systems
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The SUD473 series monitors for undervoltage or overvoltage in three-phase AC systems with neutral. The response values are set via potentiometers. Power is supplied to the device via a combination of a supply voltage from the system being monitored and an internal energy backup system.
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VMD421H |
Digital Voltage, Frequency, and Phase Relay for Three-Phase AC
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The VMD421H is a powerful, all-in-one unit for three-phase (three or four wire) AC systems for 0 to 500 V monitoring over/undervoltage, over/underfrequency, asymmetry, phase sequence, and phase failure. Values are displayed and changed via a digital seven-segment display and menu. Values are displayed as true RMS values, and many different delays can be set. The VMD421H contains an internal energy backup.
This unit is powered off of the line that it is monitoring. For the version that utilizes an auxiliary supply voltage, please see the VMD420.
For the single-phase AC and DC version, please see the VME421H.
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VME421H |
Digital Voltage and Frequency Relay for AC/DC Systems
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The VME421H is a powerful, all-in-one unit for single-phase AC and DC systems for 0 to 300 V monitoring over/undervoltage and over/underfrequency. Values are displayed and changed via a digital seven-segment display and menu. Values are displayed as true RMS values, and many different delays can be set. The VME421H contains an internal energy backup.
This unit is powered off of the line that it is monitoring. For the version that utilizes an auxiliary supply voltage, please see the VME420.
Note: for the three-phase AC version, please see the VMD421H.
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SUA143 |
Voltage Relay for AC/DC Systems
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The SUA143 series monitors either undervoltage or overvoltage in single-phase AC or DC systems. An external supply voltage is not required.
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SUA145 |
Voltage Relay for AC/DC Systems
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The SUA145 series monitors either undervoltage or overvoltage in single-phase AC or DC systems. An external supply voltage is not required.
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SUR353Z |
Undervoltage Relay for Three-Phase AC Systems
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The SUR353Z series monitors for undervoltage in three-phase AC systems with or without neutral. External supply voltage is not required.
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SUR357Z |
Voltage Relay for Three-Phase AC Systems
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The SUR357Z series monitors for undervoltage and overvoltage in three-phase AC systems with or without neutral. Special input transformers attenuate interferences from the system. Input circuit protection is included. An external supply voltage is not required.
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SUR358Z |
Voltage Relay for Three-Phase AC Systems
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The SUR357Z series monitors for undervoltage and overvoltage in three-phase AC systems with or without neutral. Special input transformers attenuate interferences from the system. Input circuit protection is included. An external supply voltage is not required.
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SUG140 |
Undervoltage Relay for DC Systems
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The SUG140 series monitors for undervoltage in a DC system. Response value, response delay, and hysteresis are adjustable via potentiometers. An external supply voltage is required.
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SUG141 |
Overvoltage Relay for DC Systems
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The SUG141 series monitors for overvoltage in a DC system. Response value, response delay, and hysteresis are adjustable via potentiometers. An external supply voltage is required.
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