{"title":"77C Series","description":"","products":[{"product_id":"littelfuse-77c-pump-monitor-overload-relay-100-240v-single-phase-2-800fla","title":"Littelfuse 77C Pump Monitor Overload Relay 100-240V Single Phase 2-800FLA","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 77C Pump Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 777\/ 77C is a fully programmable electronic overload\nrelay designed to protect any motor drawing 2-800 full load\namps (external CTs are required above 90 amps). Common\napplications include conveyor systems, HVAC equipment, saws\nand grinders, fan motors, and almost any pumping application.\n\u003c\/p\u003e\n\u003cp\u003e\n\tAll of the overload relays provide unsurpassed protection by\ncombining overload, underload, and voltage in one package.\nFor standalone applications, the units incorporate a 3-digit\nLED display that is used for programming, providing real-time\noperational information and displaying diagnostic codes to aid\nin troubleshooting a fault condition. The units also feature a\ncommunications port that can be used with communication\nmodules listed in the 777 accessories section to form a\nModbus, DeviceNet™, Profibus, or Ethernet network. Up to\n99 units can be remotely monitored and controlled from a PC,\nPLC, or SCADA system, and data logging through a PC with\nthe optional Solutions software. This capability allows for a\nsimple, cost-effective way to meet new requirements for\narc-flash safety.\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 77C Pump Monitor Typical Application\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConveyor Systems\n\t\u003c\/li\u003e\n\u003cli\u003eHVAC Equipment\n\t\u003c\/li\u003e\n\u003cli\u003eSaws and Grinders\n\t\u003c\/li\u003e\n\u003cli\u003eFan Motors\n\t\u003c\/li\u003e\n\u003cli\u003eAll Pumping Applications With Single-Phase Electric Motors\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\nLittelfuse 77C Pump Monitor Technical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\tProtects Single-Phase Motors From:\n\u003cul\u003e\n\u003cli\u003eOverload\n\t\t\u003c\/li\u003e\n\u003cli\u003eUnderload\n\t\t\u003c\/li\u003e\n\u003cli\u003eJams\n\t\t\u003c\/li\u003e\n\u003cli\u003eLow Voltage\n\t\t\u003c\/li\u003e\n\u003cli\u003eHigh Voltage\n\t\t\u003c\/li\u003e\n\u003cli\u003eRapid Cycling\n\t\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully Programmable\n\t\u003c\/li\u003e\n\u003cli\u003eAutomatic Reset With Three Separate Restart Delay Timers, or Manual\n    Reset\n\t\u003c\/li\u003e\n\u003cli\u003eTamper Guard\n\t\u003c\/li\u003e\n\u003cli\u003eRS-485 Communications Port (Communications Module Sold Separately)\n\t\u003c\/li\u003e\n\u003cli\u003e3-digit LED Diagnostic Display\n\t\u003c\/li\u003e\n\u003cli\u003eRemote Reset\n\t\u003c\/li\u003e\n\u003cli\u003eLast Fault Memory\n\t\u003c\/li\u003e\n\u003cli\u003eUL and ULC Listed\n\t\u003c\/li\u003e\n\u003cli\u003eCE Compliant\n\t\u003c\/li\u003e\n\u003cli\u003eCSA Approved\n\t\u003c\/li\u003e\n\u003cli\u003eSurface or DIN Rail Mount\n\t\u003c\/li\u003e\n\u003cli\u003e5-year Warranty\n\t\u003c\/li\u003e\n\u003cli\u003eMade in USA\n\t\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49317631164733,"sku":"MSR77C","price":552.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr77cseries_001_wbg.jpg?v=1725291485"},{"product_id":"littelfuse-77c-kw-hp-pump-monitor-overload-relay-100-240v-single-phase-2-800fla","title":"Littelfuse 77C-KW\/HP Pump Monitor Overload Relay 100-240V Single Phase 2-800FLA","description":"\u003cp\u003e\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 77C-KW\/HP Pump Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003eThe 77C-KW\/HP and 77C-LR-KW\/HP are fully programmable pump protection relays which will monitor the voltage and current for high or low voltage, overload and underload conditions based on power, in one package. The underpower trip feature is desirable anytime the current vs. load characteristic is non-linear or has little change. In general terms, smaller motors and slow-speed motors have little change in current over the normal load range. Larger motors that are running light loads will also show small current changes over the operating load range. Common uses include pumping applications where motors run slower than around 3400 rpm and usually have small current vs load changes; such as slow speed mixer or agitator motors up to 50 hp, and magdrive or can pumps. The Littelfuse PumpSaver® relay provides the high sensitivity of a power monitor to protect pump motors from dry run and deadhead conditions.\u003c\/p\u003e\n\u003cp\u003eThe 77C-KW\/HP Provides 480 VA @ 240 V ac output SPDT (Form C) relay contacts.\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 77C-KW\/HP Pump Monitor Typical Application\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConveyor Systems\u003c\/li\u003e\n\u003cli\u003eHVAC Equipment\u003c\/li\u003e\n\u003cli\u003eSaws and Grinders\u003c\/li\u003e\n\u003cli\u003eFan Motors\u003c\/li\u003e\n\u003cli\u003eAll Pumping Applications With Single-Phase Electric Motors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 77C-KW\/HP Pump Monitor Technical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProtects Single-Phase Motors From:\n\u003cul\u003e\n\u003cli\u003eOverload\u003c\/li\u003e\n\u003cli\u003eUnderload\u003c\/li\u003e\n\u003cli\u003eJams\u003c\/li\u003e\n\u003cli\u003eLow Voltage\u003c\/li\u003e\n\u003cli\u003eHigh Voltage\u003c\/li\u003e\n\u003cli\u003eRapid Cycling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully Programmable\u003c\/li\u003e\n\u003cli\u003eAutomatic Reset With Three Separate Restart Delay Timers, or Manual Reset\u003c\/li\u003e\n\u003cli\u003eTamper Guard\u003c\/li\u003e\n\u003cli\u003eRS-485 Communications Port (Communications Module Sold Separately)\u003c\/li\u003e\n\u003cli\u003e3-digit LED Diagnostic Display\u003c\/li\u003e\n\u003cli\u003eRemote Reset\u003c\/li\u003e\n\u003cli\u003eLast Fault Memory\u003c\/li\u003e\n\u003cli\u003eUL and cUL Listed\u003c\/li\u003e\n\u003cli\u003eCE Compliant\u003c\/li\u003e\n\u003cli\u003eCSA Approved\u003c\/li\u003e\n\u003cli\u003eSurface or DIN Rail Mount\u003c\/li\u003e\n\u003cli\u003e5-year Warranty\u003c\/li\u003e\n\u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49317632344381,"sku":"MSR77CKWHP","price":558.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr77ckwhpseries_001_wbg.jpg?v=1725291495"},{"product_id":"littelfuse-77c-lr-pump-monitor-overload-relay-100-240v-single-phase-1-9fla","title":"Littelfuse 77C-LR Pump Monitor Overload Relay 100-240V Single Phase 1-9FLA","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 77C-LR Pump Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 777\/ 77C is a fully programmable electronic overload\nrelay designed to protect any motor drawing 2-800 full load\namps (external CTs are required above 90 amps). Common\napplications include conveyor systems, HVAC equipment, saws\nand grinders, fan motors, and almost any pumping application.\n\u003c\/p\u003e\n\u003cp\u003e\n\tAll of the overload relays provide unsurpassed protection by\ncombining overload, underload, and voltage in one package.\nFor standalone applications, the units incorporate a 3-digit\nLED display that is used for programming, providing real-time\noperational information and displaying diagnostic codes to aid\nin troubleshooting a fault condition. The units also feature a\ncommunications port that can be used with communication\nmodules listed in the 777 accessories section to form a\nModbus, DeviceNet™, Profibus, or Ethernet network. Up to\n99 units can be remotely monitored and controlled from a PC,\nPLC, or SCADA system, and data logging through a PC with\nthe optional Solutions software. This capability allows for a\nsimple, cost-effective way to meet new requirements for\narc-flash safety.\n\u003c\/p\u003e\n\u003cp\u003eThe 77C-LR provides 480VA @ 240VAC output SPDT relay contacts\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 77C-LR Pump Monitor Typical Application\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConveyor Systems\n\t\u003c\/li\u003e\n\u003cli\u003eHVAC Equipment\n\t\u003c\/li\u003e\n\u003cli\u003eSaws and Grinders\n\t\u003c\/li\u003e\n\u003cli\u003eFan Motors\n\t\u003c\/li\u003e\n\u003cli\u003eAll Pumping Applications With Single-Phase Electric Motors\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\nLittelfuse 77C-LR Pump Monitor Technical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\tProtects Single-Phase Motors From:\n\u003cul\u003e\n\u003cli\u003eOverload\n\t\t\u003c\/li\u003e\n\u003cli\u003eUnderload\n\t\t\u003c\/li\u003e\n\u003cli\u003eJams\n\t\t\u003c\/li\u003e\n\u003cli\u003eLow Voltage\n\t\t\u003c\/li\u003e\n\u003cli\u003eHigh Voltage\n\t\t\u003c\/li\u003e\n\u003cli\u003eRapid Cycling\n\t\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully Programmable\n\t\u003c\/li\u003e\n\u003cli\u003eAutomatic Reset With Three Separate Restart Delay Timers, or Manual\n    Reset\n\t\u003c\/li\u003e\n\u003cli\u003eTamper Guard\n\t\u003c\/li\u003e\n\u003cli\u003eRS-485 Communications Port (Communications Module Sold Separately)\n\t\u003c\/li\u003e\n\u003cli\u003e3-digit LED Diagnostic Display\n\t\u003c\/li\u003e\n\u003cli\u003eRemote Reset\n\t\u003c\/li\u003e\n\u003cli\u003eLast Fault Memory\n\t\u003c\/li\u003e\n\u003cli\u003eUL and cUL Listed\n\t\u003c\/li\u003e\n\u003cli\u003eCE Compliant\n\t\u003c\/li\u003e\n\u003cli\u003eCSA Approved\n\t\u003c\/li\u003e\n\u003cli\u003eSurface or DIN Rail Mount\n\t\u003c\/li\u003e\n\u003cli\u003e5-year Warranty\n\t\u003c\/li\u003e\n\u003cli\u003eMade in USA\n\t\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49317632606525,"sku":"MSR77CLR","price":552.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr77cseries_001_wbg_897a170c-84b2-4607-8924-7ddbcf6d5b37.jpg?v=1725291504"},{"product_id":"littelfuse-77c-lr-kw-hp-pump-monitor-overload-relay-100-240v-single-phase-1-9fla","title":"Littelfuse 77C-LR-KW\/HP Pump Monitor Overload Relay 100-240V Single Phase 1-9FLA","description":"\u003cp\u003e\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 77C-LR-KW\/HP Pump Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003eThe 77C-KW\/HP and 77C-LR-KW\/HP are fully programmable pump protection relays which will monitor the voltage and current for high or low voltage, overload and underload conditions based on power, in one package. The underpower trip feature is desirable anytime the current vs. load characteristic is non-linear or has little change. In general terms, smaller motors and slow-speed motors have little change in current over the normal load range. Larger motors that are running light loads will also show small current changes over the operating load range. Common uses include pumping applications where motors run slower than around 3400 rpm and usually have small current vs load changes; such as slow speed mixer or agitator motors up to 50 hp, and magdrive or can pumps. The Littelfuse PumpSaver® relay provides the high sensitivity of a power monitor to protect pump motors from dry run and deadhead conditions.\u003c\/p\u003e\n\u003cp\u003eSmall motors, those under 3 hp and especially fractional horsepower, exhibit small changes in current vs. load, but the change in power is large. When larger motors are derated (run below their rated horsepower) the change in current is small vs. load, but again, the change in power is large and linear. Other typical applications include slower speed mixer or agitator motors up to 50 hp and beyond. These motors and others that run slower than around 3400 rpm usually have small current changes vs. load.\u003c\/p\u003e\n\u003cp\u003eThe 77C-LR-KW\/HP Provides 480 VA @ 240 V ac output SPDT (Form C) relay contacts.\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 77C-LR-KW\/HP Pump Monitor Typical Application\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConveyor Systems\u003c\/li\u003e\n\u003cli\u003eHVAC Equipment\u003c\/li\u003e\n\u003cli\u003eSaws and Grinders\u003c\/li\u003e\n\u003cli\u003eFan Motors\u003c\/li\u003e\n\u003cli\u003eAll Pumping Applications With Single-Phase Electric Motors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 77C-LR-KW\/HP Pump Monitor Technical Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProtects Single-Phase motors from:\n\u003cul\u003e\n\u003cli\u003eOverload\u003c\/li\u003e\n\u003cli\u003eUnderload\u003c\/li\u003e\n\u003cli\u003eJams\u003c\/li\u003e\n\u003cli\u003eLow Voltage\u003c\/li\u003e\n\u003cli\u003eHigh Voltage\u003c\/li\u003e\n\u003cli\u003eRapid Cycling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eFully Programmable\u003c\/li\u003e\n\u003cli\u003eAutomatic Reset With Three Separate Restart Delay Timers, or Manual Reset\u003c\/li\u003e\n\u003cli\u003eTamper Guard\u003c\/li\u003e\n\u003cli\u003eRS-485 Communications Port (Communications Module Sold Separately)\u003c\/li\u003e\n\u003cli\u003e3-digit LED Diagnostic Display\u003c\/li\u003e\n\u003cli\u003eRemote Reset\u003c\/li\u003e\n\u003cli\u003eLast Fault Memory\u003c\/li\u003e\n\u003cli\u003eUL and cUL Listed\u003c\/li\u003e\n\u003cli\u003eCE Compliant\u003c\/li\u003e\n\u003cli\u003eCSA Approved\u003c\/li\u003e\n\u003cli\u003eSurface or DIN Rail Mount\u003c\/li\u003e\n\u003cli\u003e5-year Warranty\u003c\/li\u003e\n\u003cli\u003eMade in USA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49317633163581,"sku":"MSR77CLRKWHP","price":558.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr77ckwhpseries_001_wbg_8e7bc752-ed5e-4b41-8abf-60dcc837de26.jpg?v=1725291512"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/collections\/msr77cseries_001_wbg_f0a314c6-f67d-4ca5-80af-3c128aa72895.jpg?v=1727896100","url":"https:\/\/rcworst.com\/collections\/77c-series.oembed","provider":"R.C. Worst \u0026 Company Inc","version":"1.0","type":"link"}