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Monitors & Relays
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Electrical Monitors measure various criteria of electrical current and take corrective action when needed. Browse voltage monitors, load sensors, remote monitors, relays and more below.

Littelfuse 250-600 Three-Phase Voltage Monitor MSR250-600, Littelfuse 250-600, 475-600V, Three-Phase, Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $236.62
Availability: Special Order
Littelfuse/Symcom Item #: MSR250-600 -
Littelfuse 250A Three-Phase Voltage Monitor MSR250A, Littelfuse 250A, 190-480V Three-Phase, Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $236.62
Availability: Special Order
Littelfuse/Symcom Item #: MSR250A -
Littelfuse 250A-MET Three-Phase Voltage Monitor (Replaces META) MSR250A-MET, Littelfuse 250A-MET, 190-480V Three-Phase, Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $227.55
Availability: Special Order
Littelfuse/Symcom Item #: MSR250AMET -
Littelfuse 350-200 Three-Phase Voltage/Phase Monitor MSR350-200, Littelfuse 350-200, 380-480V, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $292.45
Availability: Special Order
Littelfuse/Symcom Item #: MSR350-200 -
Littelfuse 350-200-2 Three-Phase Voltage/Phase Monitor MSR350-200-2, SymCom 350-200-2, 190-240V, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $292.45
Availability: Special Order
Littelfuse/Symcom Item #: MSR350-200-2 -
Littelfuse 350-200-2-6 Three-Phase Voltage/Phase Monitor MSR350-200-2-6, SymCom 350-200-2-6, 190-240V, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $292.45
Availability: Special Order
Littelfuse/Symcom Item #: MSR350-200-2-6 -
Littelfuse 355-200 Three-Phase Voltage/Phase Monitor MSR355-200, Littelfuse355-200, 19-240V, Adjustable, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $359.29
Availability: Special Order
Littelfuse/Symcom Item #: MSR355200 -
Littelfuse 355-400 Three-Phase Voltage/Phase Monitor MSR355-400, SymCom 355-400, 380-480V, Adjustable, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $359.29
Availability: Special Order
Littelfuse/Symcom Item #: MSR355400 -
Littelfuse 355-400-5 Three-Phase Voltage/Phase Monitor MSR355-400-5, SymCom355-400-5, 380-480V, Adjustable, two 480v relays, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $359.29
Availability: Special Order
Littelfuse/Symcom Item #: MSR3554005 -
Littelfuse 355-600 Three-Phase Voltage/Phase Monitor MSR355-600, SymCom 355-600, 475-600V, Adjustable, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $359.29
Availability: Special Order
Littelfuse/Symcom Item #: MSR355600 -
Littelfuse 455 Three-Phase Voltage/Phase Monitor MSR455 Littelfuse 455, 190-480V, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $255.02
Availability: Special Order
Littelfuse/Symcom Item #: MSR455 -
Littelfuse 455-575 Three-Phase Voltage/Phase Monitor MSR455-575 littelfuse 455-575, 475-600V, Three-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $255.02
Availability: Special Order
Littelfuse/Symcom Item #: MSR455575 -

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