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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.
Note: for the single-phase AC and DC version, please see the VME420.
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VMD421H |
Digital Voltage, Frequency, and Phase Relay for Three-Phase AC Systems
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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.
Note: for the single-phase AC and DC version, please see the VME421H.
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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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VME420 |
Digital Voltage and Frequency Relay for AC/DC Systems
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The VMD420 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.
Note: for the three-phase AC version, please see the VMD420.
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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.
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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