Littelfuse, Inc. Datasheets for Protective Relays and Monitoring Relays

Protective relays and monitoring relays detect or monitor for abnormal power system conditions.
Protective Relays and Monitoring Relays: Learn more

Product Name Notes
PumpSavers Three Phase -- 777-HVR-KW/HP-P2 3-Ph Power Monitor/ 340-480V/ 2-800FLA/ 480V Relay/Plus
PumpSavers Three Phase -- 777-KW/HP-P2 3-Phase Power Monitor/ 200-480V/ 2-800FLA/ Plus
Three Phase Power Monitor -- 777-MLR-KW/HP-P2 3-Phase Power Monitor/ 200-480V/ 3-15FLA/Plus
PumpSavers Three Phase -- 777-LR-KW/HP-P2 3-Phase Power Monitor/ 200-480V/1-800FLA/Plus
Three Phase Power Monitor -- 777-575-KW/HP-P2 3-Phase Power Monitor/ 500-600V/ 2-800FLA/ Plus
Single Function Relays -- SIR1A1A4
Single Function Relays -- SIR1A20A4
Single Function Relays -- SIR1B6A4
Single Function Relays -- SIR1B6B4
Single Function Relays -- SIR1C20B6
Single Function Relays -- SIR2A20A4
Single Function Relays -- SIR2B20A4
Single Function Relays -- SIR2B20B4
Designed for industrial applications requiring rugged reliable operation. Provides an optically isolated, high capacity, solidstate output, with power switching capability up to 20A steady state, 200A inrush. Zero voltage switching...
Three Phase Voltage Monitor -- 202 Model 202 is an auto-ranging voltage monitor designed to protect three-phase motors regardless of size. It is used on 190-480 VAC, 50 to 60 Hz motors to prevent damage caused...
Three Phase Voltage Monitor -- 250A Model 250A is an auto ranging voltage monitor designed to protect 3-phasemotors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors toprotect the motors from damage...
Three Phase Voltage Monitor -- 350-200
Three Phase Voltage Monitor -- 350-200-2
Three Phase Voltage Monitor -- 350-200-2-6
Three Phase Voltage Monitor -- 350-200-2-8
Three Phase Voltage Monitor -- 350-200-2-9
Three Phase Voltage Monitor -- 350-400
Three Phase Voltage Monitor -- 350-400-2
Three Phase Voltage Monitor -- 350-400-2-5
Three Phase Voltage Monitor -- 350-400-2-6
Three Phase Voltage Monitor -- 350-400-2-8
Three Phase Voltage Monitor -- 350-400-2-9
Three Phase Voltage Monitor -- 350-600
Three Phase Voltage Monitor -- 350-600-2
Three Phase Voltage Monitor -- 350-600-2-6
Three Phase Voltage Monitor -- 350-600-2-8
Three Phase Voltage Monitor -- 350-600-2-9
Model 350 3-phase voltage monitor is perfect for heavy-duty applicationssuch as rural pump panels, commercial and rural HVAC equipment, and oilrigs. The Model 350 is a versatile voltage monitor designed...
Single Phase Current Monitor -- CP-5-115
Single Phase Current Monitor -- CP-5-460
Model CP-5 is an undercurrent monitor designed to monitor one leg of athree phase system. It is commonly used as a tower monitor on centerpivot irrigation systems to detect a...
Ground Fault Relays -- SE-703-03-00
Ground Fault Relays -- SE-703-03-02
Ground Fault Relays -- SE-703-0D-00
Ground Fault Relays -- SE-703-0D-02
Ground Fault Relays -- SE-703-0T-00
Ground Fault Relays -- SE-703-0T-02
Ground Fault Relays -- SE-703-0U-00
Ground Fault Relays -- SE-703-0U-02
Operates on AC solidly grounded and AC resistance grounded systems. The SE-703 is a microprocessor-based ground-fault relay for resistance and solidly-earthed systems. It offers sensitive ground-fault detection as low as...
Ground Fault Relays -- PGR-3200
Ground Fault Relays -- PGR-3200-120
Operates on AC ungrounded systems. The PGR-3200 detects ground faults by continuously monitoring the insulation integrity of ungrounded electrical systems. The relay monitors the insulation for damage and assists with...
Ground Fault Relays -- PGR-4300-12
Ground Fault Relays -- PGR-4300-120
Ground Fault Relays -- PGR-4300-24
Operates on solidly grounded AC systems. The PGR-4300 Generator Ground-Fault Relay provides a simple method for detecting a ground-fault condition on generators without the need for current transformers (CTs). This...
Single Phase Voltage Monitor -- 50R-400-2-9 Single-Phase VM/380-480V/adj.RD/HV detect./480V relay
Single Phase Voltage Monitor -- 202-200-SP-NHV Single-Phase Volt. Monitor/230V/No High Voltage Shutdown
Single Phase Voltage Monitor -- 50R-200 Single-Phase Voltage Monitor/ 190-240V
Single Phase Voltage Monitor -- 50R-100 Single-Phase Voltage Monitor/ 95-120V
Single Phase Voltage Monitor -- 50R-200-2-9 Single-Phase Voltage Monitor/190-240V/adj.RD/HV detect
Single Phase Voltage Monitor -- 202-200-SP
Single Phase Voltage Monitor -- 50R-200-2
Single-Phase Voltage Monitor/190-240V/adj.RD
Single Phase Voltage Monitor -- 50R-200-3 Single-Phase Voltage Monitor/190-240V/adj.TD
Single Phase Voltage Monitor -- 50R-400 Single-Phase Voltage Monitor/380-480V/480V relay
Single Phase Voltage Monitor -- 50R-400-2 Single-Phase Voltage Monitor/380-480V/adj.RD/480V relay
Single Phase Voltage Monitor -- 50R-400-3 Single-Phase Voltage Monitor/380-480V/adj.TD/480V relay
Single Phase Voltage Monitor -- 50R-100-2 Single-Phase Voltage Monitor/95-120V/adj.RD
PumpSavers Single Phase -- 234-P SymCom PumpSaver® Model 234-P protects single-phase pumps from dry-well, dead-head, rapid-cycle,jammed-impeller, and over/undervoltage conditions.Typical applications include residential waterwells,commercial waterwells, irrigation wells, and golf courseand other sprinkler systems.The PumpSaver® Model 234-P...
PumpSavers Single Phase -- 231-Insider-P SymCom's Model 231-Insider-P single-phase PumpSaver®Plusfits inside ¹/?, ½, ¾, and 1hp 230V control boxes and is designed toprotect single-phase pumps from dry-well, dead-head, jammedimpeller, rapid-cycle, overvoltage, and undervoltage condi-tions.A calibration...
Three Phase Current Monitor -- 520CP-115
Three Phase Current Monitor -- 520CP-230
Three Phase Current Monitor -- 520CP-460
SymCom's Model 520CP is a fully programmable, microcontroller-based, current sensing device designed to monitor 3-phase pumps or systems with ramp up times of 4 seconds or less. Applications include submersible...
Three Phase Current Monitor -- 520CS-115 SymCom's Model 520CS is a fully programmable, microcontroller-based, current sensing device designed to monitor 3-phase pumps or systems with ramp up times of up to 50 seconds. Applications include submersible...
Three Phase Voltage Monitor -- 601 SymCom's Model 601 is a fully programmable electronic voltage monitor designed to monitor three-phase voltage systems. When a harmful condition is detected, the MotorSaver's output relay is deactivated after the...
Three Phase Voltage Monitor -- 601-575 SymCom's Model 601-575 is a fully programmable electronic voltage monitor designed to monitor three-phase voltage systems. When a harmful condition is detected, the MotorSaver's output relay is deactivated after the...
Voltage Monitoring Relays -- 102600 The 102A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-400VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor...
Voltage Monitoring Relays -- 102A
Voltage Monitoring Relays -- 102A-9
Voltage Monitoring Relays -- 102A2
Voltage Monitoring Relays -- 102A3
The 102A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-600VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor...
Voltage Monitoring Relays -- 201-100-DPDT
Voltage Monitoring Relays -- 201-100-DPDT-60MS
Voltage Monitoring Relays -- 201-200-DPDT
The 201-xxx-DPDT is an 11-pin octal base plug-in voltage monitor designed to protect 3-phase motors regardless of size. The 201-100-DPDT is used on 95-120VAC, 50/60Hz motors and the 201-200-DPDT is...
Three Phase Voltage Monitor -- 201-100-DPDT
Three Phase Voltage Monitor -- 201-100-DPDT-60ms
Three Phase Voltage Monitor -- 201-200-DPDT
Three Phase Voltage Monitor -- 201-200-DPDT-60ms
The 201-XXX-DPDT is an 11-pin octal base plug-in voltage monitordesigned to protect 3-phase motors regardless of size. The 201-100-DPDT is used on 95-120VAC, 50/60Hz motors and the 201-200-DPDT is used...
Voltage Monitoring Relays -- 201-100-SP
Voltage Monitoring Relays -- 201-200-SP
Voltage Monitoring Relays -- 201-200-SP-T-9
The 201-xxx-SP is an 8-pin octal-base, plug-in voltage monitor designed to protect single-phase motors regardless of size. The 201-100-SP is used on 95-120VAC, 50/60Hz motors to prevent damage caused by...
Voltage Monitoring Relays -- 201-100-SP-DPDT
Voltage Monitoring Relays -- 201-200-SP-DPDT
The 201-xxx-SP-DPDT is an 8-pin octal-base, plug-in voltage monitor designed to protect single-phase motors regardless of size. The 201-100-SP-DPDT is used on 95-120VAC, 50/60Hz motors to prevent damage caused by...
Single Phase Voltage Monitor -- 201-100-SP-DPST
Single Phase Voltage Monitor -- 201-200-SP-DPDT
The 201-xxx-SP-DPDT is an 8-pin octal-base, plug-in voltagemonitor designed to protect single-phase motors regardless of size.The 201-100-SP-DPDT is used on 95-120VAC, 50/60Hz motors toprevent damage caused by low voltage. The...
Voltage Monitoring Relays -- 201A
Voltage Monitoring Relays -- 201A-9
The 201A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor...
Three Phase Voltage Monitor -- 201A
Three Phase Voltage Monitor -- 201A-9
The 201A is an auto ranging 8-pin, plug-in voltage monitor designedto protect 190-480VAC, 3-phase motors regardless of size. It is usedto prevent damage caused by single-phasing, low voltage, phasereversal and...
Voltage Monitoring Relays -- 201-575-AU-OT
Voltage Monitoring Relays -- 201575-AU
Voltage Monitoring Relays -- 201A-AU
Voltage Monitoring Relays -- 201A-AU-OT
The 201A-AU is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. Has user adjustable 1-30 second trip delay, manual or 1-500 second restart delay,...
Voltage Monitoring Relays -- 202-575-RP
Voltage Monitoring Relays -- 202-RP
The 202 series is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-600VAC, 50/60Hz motors regardless of size. The 202-RP monitors the phase rotation of 3-phase systems and trips on...
Voltage Monitoring Relays -- 202
Voltage Monitoring Relays -- 202-200-SP
Voltage Monitoring Relays -- 202-200-SP-NHV
The 202-200-SP voltage monitor is designed to protect single-phase motors regardless of size. It can be used with 190V-240VAC, 50/60Hz motors to prevent damage caused by incoming power problems. A...
Voltage Monitoring Relays -- 250A
Voltage Monitoring Relays -- 250A-MET
The 250A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50*/60Hz motors regardless of size from low and high voltage, unbalance/single-phase, and reverse-phase. The product provides a user...
Voltage Monitoring Relays -- 250-100-MET
Voltage Monitoring Relays -- 250600
The 250A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size from low and high voltage, unbalance/single-phase, and reverse-phase. The product provides a user...
Voltage Monitoring Relays -- 350200
Voltage Monitoring Relays -- 3502002
Voltage Monitoring Relays -- 35020026
Voltage Monitoring Relays -- 35020028
Voltage Monitoring Relays -- 35020029
Voltage Monitoring Relays -- 350400
Voltage Monitoring Relays -- 3504002
Voltage Monitoring Relays -- 35040025
Voltage Monitoring Relays -- 35040026
Voltage Monitoring Relays -- 35040028
Voltage Monitoring Relays -- 35040029
Voltage Monitoring Relays -- 350600
Voltage Monitoring Relays -- 3506002
Voltage Monitoring Relays -- 35060026
Voltage Monitoring Relays -- 35060028
Voltage Monitoring Relays -- 35060029
The 350 is a heavy-duty voltage monitor. This product should be used when high current relays or dual contacts are required, or 480V controls are used. Since the 350 uses...
Voltage Monitoring Relays -- 355200
Voltage Monitoring Relays -- 355400
Voltage Monitoring Relays -- 3554005
Voltage Monitoring Relays -- 355600
The 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection...
Voltage Monitoring Relays -- 455
Voltage Monitoring Relays -- 455480R
Voltage Monitoring Relays -- 455575
The 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or...
Alternating Relays -- 50R-400-ALT The 50R-400-ALT alternating relays are used to alternate between two loads, most commonly in duplex pumping and compressor applications to balance the runtime of both loads. When used in single...
PumpSavers Three Phase -- 777-AccuPower The 777-AccuPower is a fully-programmable motor and pump protection relay with motor outputpower display. Voltage, current and power measurements are displayed on the three-digit display,as well as fault information and...
Alternating Relays -- ALT024-S
Alternating Relays -- ALT024-S-SW
Alternating Relays -- ALT115-S
Alternating Relays -- ALT115-S-SW
Alternating Relays -- ALT115-X
Alternating Relays -- ALT115-X-SW
Alternating Relays -- ALT230-S
Alternating Relays -- ALT230-S-SW
Alternating Relays -- ALT230-X
Alternating Relays -- ALT230-X-SW
The ALT alternating relays are used to alternate between two loads. The ALT is commonly used in duplex pumping applications to balance the runtime of both pumps. The ALT-S is...
Alternating Relays -- AR120A-3095
Alternating Relays -- ARP23S
Alternating Relays -- ARP41
Alternating Relays -- ARP41S
Alternating Relays -- ARP42S
Alternating Relays -- ARP43
Alternating Relays -- ARP43S
Alternating Relays -- ARP61S
Alternating Relays -- ARP62S
Alternating Relays -- ARP63S
The ARP Series is used in systems where equal run time for two motors is desirable. The selector switch allows selection of alternation of either load for continuous operation. LED’s...
Ground Fault Relays -- EL3100-00 The EL3100 is a self-powered ground-fault and phasevoltage indication system for 3-phase systems. The EL3100 meets the National Electrical Code (NEC) and the Canadian Electrical Code (CEC) requirements for ground...
Ground Fault Relays -- EL731-00-X0
Ground Fault Relays -- EL731-01-X0
Ground Fault Relays -- EL731-02-X0
Ground Fault Relays -- EL731-03-X0
Ground Fault Relays -- EL731-04-X0
Ground Fault Relays -- EL731-10-X0
Ground Fault Relays -- EL731-11-X0
Ground Fault Relays -- EL731-12-X0
Ground Fault Relays -- EL731-13-X0
Ground Fault Relays -- EL731-14-X0
Ground Fault Relays -- EL731-20-X0
Ground Fault Relays -- EL731-21-X0
Ground Fault Relays -- EL731-22-X0
Ground Fault Relays -- EL731-23-X0
Ground Fault Relays -- EL731-24-X0
The EL731 is a microprocessor-based AC/DC Sensitive Earth-Leakage Relay that offers complete coverage for all frequencies from 0-6,000 Hz. Two CT’s are required for the entire frequency range, or one...
Intrinsically Safe Relays -- ISS-100 The ISS-100 switches are UL 913 listed as an associated apparatus for interfacing between hazardous and non-hazardous areas. These units must be installed in a non-hazardous area.
Intrinsically Safe Relays -- ISS-101 The ISS-101 switches are UL 913 listed as an associated apparatus for interfacing between hazardous and non-hazardous areas. These units must be installed in a non-hazardous area.
Intrinsically Safe Relays -- ISS-102A-LC
Intrinsically Safe Relays -- ISS-102AA-DCS
Intrinsically Safe Relays -- ISS-102ACI-MC
Intrinsically Safe Relays -- ISS-102C-M-LC
Intrinsically Safe Relays -- ISS-102CCI-M-MC
The ISS-102 is a two-channel, intrinsically-safe switch designed for multiple uses including a pump-up/pump-down (latching) controller or two-channel switch. Two LEDs indicate the state of the intrinsically-safe inputs and output...
Intrinsically Safe Relays -- ISS-105
Intrinsically Safe Relays -- ISS-105-ISO
Intrinsically Safe Relays -- ISS-105-ISO-3
Intrinsically Safe Relays -- ISS-105-ISO-4
Intrinsically Safe Relays -- ISS-105-ISO-F
The ISS-105 is a “smart” five-channel intrinsically safe relay and pump controller. The ISS-105 can be configured for a wide variety of applications including alternating or non-alternating duplex, duplex separate...
Three Phase Voltage Monitor -- 102-600 The Model 102-600 is a voltage monitor designed to protect 3-phase, 475-600VAC, 50/60Hz motors from damage caused by low voltage, voltage unbalance, single phasing, and phase reversal.A unique microcontroller-based voltage...
Three Phase Voltage Monitor -- 102A
Three Phase Voltage Monitor -- 102A-2
Three Phase Voltage Monitor -- 102A-3
Three Phase Voltage Monitor -- 102A-9
The Model 102A is an auto-ranging voltage monitor designed to protect3-phase motors regardless of size. It is used on 190-480 VAC, 50 to 60Hz motors to prevent damage caused by...
PumpSavers Single Phase -- 111-Insider-P The Model 111-Insider-P single-phase PumpSaver®Plus fits in-side ¹/? and ½ hp 115V control boxes. The PumpSaver®Plus Mod-el 111-Insider-P is designed to protect single-phase pumps fromdry well, dead head, jammed impeller...
PumpSavers Single Phase -- 111P
PumpSavers Single Phase -- 111P-ENCL
The Model 111P single-phase PumpSaver®Plus is apump monitor designed to protect single-phase pumpsfrom dry-well, dead-head, jammed impeller, rapid cy-cle and overvoltage and undervoltage conditions. ThePumpSaver®Plus Model 111P protects 115 volt,...
Single Phase Voltage Monitor -- 201-100-SP
Single Phase Voltage Monitor -- 201-200-SP
Single Phase Voltage Monitor -- 201-200-SP-T-9
The Model 201-xxx-SP is an 8-pin octal base plug-in voltage moni-tor designed to protect single-phase motors regardless of size. Itcan be used on 95-120VAC (201-100-SP) or 190-240VAC (201-200-SP) motors to...
Three Phase Voltage Monitor -- 201-575-AU
Three Phase Voltage Monitor -- 201A-AU
The Model 201A-AU is the newest, most versatile, plug-in style voltage monitordesigned to protect 3-phase motors from damaging power conditions. Its wideoperating range combined with UL, cUL and CE compliance...
Three Phase Voltage Monitor -- 202-575-RP
Three Phase Voltage Monitor -- 202-RP
The Model 202-RP trips on reverse phase only. It monitors the phase rotation of three-phase systems. Critical applications include fan motors, scrollcompressors, grinders, conveyor systems, elevators and escalators. The status...
PumpSavers Single Phase -- 232-Insider The Model 232-Insider single-phase PumpSaver® fits inside 1/3, 1/2, 3/4, and 1hp, 230V Grundfos control boxes. The Model 112-Insider single-phasePumpSaver® fits inside 1/3 and 1/2hp, 115V Grundfos control boxes.The PumpSaver®...
PumpSavers Single Phase -- 233P
PumpSavers Single Phase -- 233P-1.5
PumpSavers Single Phase -- 233P-1.5-ENCL
PumpSavers Single Phase -- 233P-ENCL
The Model 233P single-phase PumpSaver®Plus is a pump monitordesigned to protect single-phase pumps from dry-well, dead-head,jammed impeller, rapid cycle, overvoltage and undervoltage condi-tions. The PumpSaver®Plus Model 233P protects 230 volt,...
PumpSavers Single Phase -- 235P
PumpSavers Single Phase -- 235P-ENCL
The Model 235P PumpSaver®Plus is designed to protectsingle-phase pumps from dry-well, dead-head, jammedimpeller and overvoltage and undervoltage conditions.The PumpSaver®Plus Model 235P protects 5-15 hp, 230Vpumps.A calibration adjustment allows the Model...
Three Phase Voltage Monitor -- 250-600 The Model 250-600 is a three-phase voltage monitor designed to protect 500-600VAC, 50/60Hz motors regardless of horsepower. It will protect motors from damage caused by single phasing, phase reversal, voltage...
Three Phase Voltage Monitor -- 355-200
Three Phase Voltage Monitor -- 355-400
Three Phase Voltage Monitor -- 355-400-5
Three Phase Voltage Monitor -- 355-600
The Model 355 3-phase voltage monitor is perfect for heavy-duty applications that need both protection and diagnostics while the motor isshut down. Applications include rural pump panels, commercial HVAC equipment,...
Three Phase Voltage Monitor -- 460
Three Phase Voltage Monitor -- 460-400Hz
Three Phase Voltage Monitor -- 460-575
Three Phase Voltage Monitor -- 460-575-14
Three Phase Voltage Monitor -- 460-MR
Three Phase Voltage Monitor -- 460-OEM
Three Phase Voltage Monitor -- 460-VBM
The Model 460 is designed to protect 3-phase motors from damaging power conditions. The 460's wide operating range combined with UL and CE compliance enables quick access to domestic and...
Single Phase Voltage Monitor -- 460-100-SP
Single Phase Voltage Monitor -- 460-200-SP
The Model 460-XXX-SP protects single-phase motors from damage caused bylow and high voltage and rapid cycling. Controls are provided to set the nominalvoltage (190-240VAC) and the desired restart delay time...
Three Phase Voltage Monitor -- 460-L
Three Phase Voltage Monitor -- 460L-OEM
The Model 460L is designed to protect 3-phase loads from damag-ing power conditions. The 460L's wide operating range combinedwith UL and CE compliance enables quick access to domestic andglobal markets.A...
Single Phase Power Monitor -- 77C-KW/HP
Single Phase Power Monitor -- 77C-LR-KW/HP
The Model 77C-KW/HP has important advantages over current monitors inmany protection applications. Any motor load that has a small or very non-linearchange in current vs. load requires the use of...
Three Phase Voltage Monitor -- 80 The Model 80 is designed to continuously monitor for ABC phasesequencing of 190-480VAC, 3-phase systems. Critical applicationsinclude fan motors, scroll compressors, grinders, conveyor systems,elevators and escalators. A solid-state sensing circuit...
Three Phase Voltage Monitor -- 460-14
Three Phase Voltage Monitor -- 460-15
The Models 460-14 and 460-15 are designed to protect 3-phase loads fromdamaging power conditions. Its wide operating range, combined with UL, cULand CE compliance, enables quick access to domestic and...
Three Phase Voltage Monitor -- 455
Three Phase Voltage Monitor -- 455-575
Three Phase Voltage Monitor -- 455480R
The New Model 455s are nowequipped* with an infrared LED to communicate with the handhelddiagnostic tool, the Informer-MS, to display MotorSaver® data to assistin monitoring and troubleshooting the system.Motor run...
Ground Fault Relays -- PGR-3100 The PGR-3100 indicates the presence of voltage on each phase of a three-phase system. The LEDs on the panel illuminate when voltage is present. When a ground-fault occurs, the voltage...
Ground Fault Relays -- PGR-4700-120
Ground Fault Relays -- PGR-4700-24
Ground Fault Relays -- PGR-4700-240
The PGR-4700 sensitive ground-fault relay provides sensitive ground-fault protection without the problems associated with high-sensitivity nuisance tripping. It detects very lowlevel leakage current on large circuits to avoid or significantly...
Ground Fault Relays -- PGR-6101-120 The PGR-6101 combines the features of a ground-fault protection relay and insulation monitor into one unit. It protects against ground faults by monitoring insulation resistance when the motor is de-energized...
Single Function Relays -- PHS120A10
Single Function Relays -- PHS120A20
Single Function Relays -- PHS120A6
Single Function Relays -- PHS230A10
Single Function Relays -- PHS230A20
Single Function Relays -- PHS230A6
The PHS Series is an ideal method of changing lamp intensity, varying the speed of a fan/motor, or controlling the temperature of a heater. The effective output voltage is adjusted...
Ground Fault Relays -- SE-502-01 The SE-502 Ground-Fault Ground-Continuity Detector provides Class-A GFCI trip level and trip times for personnel protection. As little as 5 mA of ground-fault current can be detected, and the internal...
Ground Fault Relays -- SE-601-0D
Ground Fault Relays -- SE-601-0T
Ground Fault Relays -- SE-601-0U
The SE-601 provides sensitive ground fault protection without the problems associated with nuisance tripping. Applications range from industrial 24Vdc control circuits to 800Vdc automated transportation systems. Features/Benefits: • Sensitive 1-...
Ground Fault Relays -- SE-701-03
Ground Fault Relays -- SE-701-0D
Ground Fault Relays -- SE-701-0T
Ground Fault Relays -- SE-701-0U
The SE-701 is a microprocessor-based ground-fault relay for resistance- and solidly-grounded systems. In addition to common systems, it is uniquely suited for use on systems with significant harmonic content. The...
Ground Fault Relays -- SE-703-0D
Ground Fault Relays -- SE-703-0T
Ground Fault Relays -- SE-703-0U
The SE-703 is a microprocessor-based ground-fault relay for resistance- and solidly-earthed systems. It offers sensitive ground-fault detection as low as 25 mA and can be used on systems with significant...
Ground Fault Relays -- SE-704-03
Ground Fault Relays -- SE-704-0D
Ground Fault Relays -- SE-704-0T
Ground Fault Relays -- SE-704-0U
The SE-704 is a microprocessor-based ground-fault relay for resistance- and solidly-grounded systems. It offers very sensitive ground-fault detection as low as 10 mA and can be used on systems with...
Single Function Relays -- SLR1420A
Single Function Relays -- SLR1610A
The SLR Series has no isolation between the control switch input and the solid-state output. Select the SLR for applications where the control switch is the same voltage source as...
Single Function Relays -- TCR9C The TCR9C of solid-state temperature control is a low cost modular approach to accurate control of temperature. The high power output is available in 6, 10 and 20 amperes and...