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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 50R-100 Single-Phase Voltage Monitor 95-120V (Replaces 50R-115) MSR50R100, Littelfuse 50R-100, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $223.60
Availability: Out of Stock
Littelfuse/Symcom Item #: MSR50R100 -
Littelfuse 50R-100-2 Single-Phase Voltage Monitor 95-120V (Replaces 50R-115-2) MSR50R1002, Littelfuse 50R-100-2, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $223.60
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R1002 -
Littelfuse 50R200 Single-Phase Voltage Monitor 190-240V MSR50R200, Littelfuse 50R200, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $223.60
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R200 -
Littelfuse 50R2002 Single-Phase Voltage Monitor 190-240V adj.RD MSR50R2002, Littelfuse 50R2002, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $223.60
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R2002 -
Littelfuse 50R20029 Single-Phase Voltage Monitor 190-240V adj.RD/HV detect MSR50R20029, Littelfuse 50R20029, Single-Phase Voltage Monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $251.15
Availability: Out of Stock
Littelfuse/Symcom Item #: MSR50R20029 -
Littelfuse 50R2003 Single-Phase Voltage Monitor 190-240V adj.TD MSR50R2003, Littelfuse 50R2003, Single-Phase voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $223.60
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R2003 -
Littelfuse 50R400 Single-Phase Voltage Monitor 380-480V/480V relay voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, Littelfuse 50R400
Price: $251.15
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R400 -
Littelfuse 50R4002 Single-Phase Voltage Monitor 380-480V adj.RD/480V relay MSR50R4002, voltage monitor, volt monitor, monitor, SymCom 50R-400-2, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, Littelfuse 50R4002
Price: $251.15
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R4002 -
Littelfuse 50R40029 Single-Phase Voltage Monitor 380-480V adj.RD/HV detect/480V relay MSR50R40029, Littelfuse 50R40029, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $251.15
Availability: Out of Stock
Littelfuse/Symcom Item #: MSR50R40029 -
Littelfuse 50R4003 Single-Phase Voltage Monitor 380-480V adj.TD/480V relay MSR50R4003, Littelfuse 50R4003, Single-Phase Voltage Monitor, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection, run dry protection, SymCom
Price: $251.15
Availability: Special Order
Littelfuse/Symcom Item #: MSR50R4003 -
Littelfuse 601 Three-Phase Voltage Monitor MSR601 Littelfuse 601, 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: $454.94
Availability: Special Order
Littelfuse/Symcom Item #: MSR601 -
Littelfuse 601-CS-D-P1 Three-Phase Programmable Power Monitor MSR601CS-D-P1, Littelfuse 601CS-D-P1, 3 Phase, voltage monitor, volt monitor, monitor, voltage, protection, motor protection, pump protection, motor saver, current protection,
Price: $967.60
Availability: Special Order
Littelfuse/Symcom Item #: MSR601CSDP1 -

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