Phase Failure Relay

Littelfuse

The 777 is a fully programmable electronic overload relay designed to protect any motor drawing 2-800 full load amps (external CTs are required above 90 amps). The 777 (family of products) is for 3-phase 200-480VAC applications, with several specialized units for other voltage ranges and unique applications. Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. Some unique applications include use with a Subtrol equipped Franklin submersible motor to detect high motor temperatures and applications where a fast linear trip is required. All of the overload relays provide unsurpassed protection by combining overload, voltage, phase loss and reversal, voltage and current unbalance, power monitoring, and underload based on current in one package. For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time operational information and displaying diagnostic codes to aid in troubleshooting a fault condition. The units also feature a communications port that can be used with communication modules listed in the 777 accessories section to form a Modbus, DeviceNet Profibus, or Ethernet network. Up to 99 units can be remotely monitored and controlled from a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions software. This capability allows for a simple, cost-effective way to meet new requirements for arc-flash safety.

777-P2 Fully Programmable Overload Relay, 2 to 20 A, 1 Form C SPDT Contact Form

MFR: Littelfuse

MFR #: 777-P2

UPC: 079458991116

Item #: 1403467

Littelfuse

777-LR-P2 3-Phase Overload Relay, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 777-LR-P2

UPC: 079458991048

Item #: 182434

Littelfuse

102A3 102A 3-Phase Monitor, 190 to 480 V AC, 10 A, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 102A3

UPC: 079458990058

Item #: 24880

Littelfuse

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 automatically selects between the 200V and 400V range. A unique microcontroller-based voltage and phase-sensing circuit constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 102A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.

102A Symcom 3-Phase Phase Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 102A

UPC: 079458990034

Item #: 145443

Littelfuse

3-Phase Plug-In Voltage Monitor 190-480Vac, 50/60Hz

MFR: Littelfuse

MFR #: 201A-AU

UPC: 079458990232

Item #: 1268612

Littelfuse

601 Monitor, 250 V, 6.3 A

MFR: Littelfuse

MFR #: 601

UPC: 079458989632

Item #: 1543863

Littelfuse

460-B 3-Phase Monitor, 190 to 480 V AC, 10 A, 1 Form C Contact

MFR: Littelfuse

MFR #: 460-B

UPC: 079458990591

Item #: 1359341

Littelfuse

460-100-SP 1-Phase Voltage Monitor, 95 to 120 V AC, 10 A

MFR: Littelfuse

MFR #: 460-100-SP

UPC: 079458990508

Item #: 878271

Littelfuse

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 impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times. The 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitors circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install. Equipped with an infrared LED, the 455 Sereies can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip point, restart and trip delay settings, LED status and more.

455 Symcom 3-Phase Dual Range Voltage Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 455

UPC: 079458989618

Item #: 1506441

Littelfuse

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 selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The 250A also features adjustable or manual restart delay. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the Littelfuses output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The Model 250A includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.

250A Symcom 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 2 Form C DPDT Contact

MFR: Littelfuse

MFR #: 250A

UPC: 079458990447

Item #: 1564903

Littelfuse

355-400 Symcom 3-Phase Voltage Monitoring Relay, 475 to 600 V AC, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 355-400

UPC: 079458989816

Item #: 177013

Littelfuse

The 460 is a 3-phase voltage monitor that protects 190-480VAC or 475-600V, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically senses line voltage. This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions such as low, high, and unbalanced voltage, loss of any phase, and phase reversal. When a harmful condition is detected, the 460 output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay). The trip and restart delays prevent nuisance tripping due to rapidly fluctuating power line conditions. All 460 models feature adjustable 1-30 second trip delay, 1-500 second restart delay, 2-8% voltage unbalance trip point, and one form C contact except where noted.

460-15 Symcom MotorSaver 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 1NO 1 Form A SPST Contact

MFR: Littelfuse

MFR #: 460-15

UPC: 079458990522

Item #: 465110

Littelfuse

3PH VM/380-480V/adj.RD/DPDT 480V Relay. 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 heavy-duty relays, it comes in fixed voltage range models rather than a dual autoranging version like the Model 250. The 350-200 has a 15A general purpose contact. The 350-400 provides a SPDT (Form C) relay rated to switch up to 600V, allowing the use of 480V controls, eliminating the need for a control power transformer to step the voltage down to 120-240V. Several DPDT (two Form C contacts) relay models are also available. The 350 microcontroller-based family of products are low cost yet highly advanced solutions to heavy-duty problems. The 350 includes advanced single LED diagnostics. Five different light patterns distinguish faults and normal operating conditions. Other options such as high voltage trip and adjustable restart delay are available.

350-400-2-5 Symcom 3-Phase Fixed Trip Heavy Duty Variable Restart Delay Voltage Monitoring Relay, 380 to 480 V AC, DPDT Contact

MFR: Littelfuse

MFR #: 350-400-2-5

UPC: 079458989953

Item #: 1521030

Littelfuse

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 automatically selects between the 200V and 400V range. The 201A includes advanced single LED diagnostics, where color and different light patterns distinguish between faults and normal conditions.This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the 201As output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels.

201A-9 Symcom MotorSaver 3-Phase Auto Ranging Dual Range Voltage Monitoring Relay, 190 to 480 V AC, 8 Pin, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 201A-9

UPC: 079458990225

Item #: 433950

Littelfuse

The 460-15-100-SLD is a seal-leak detector to sense seal failures on submersible pumps. A microcontroller-based relay monitors the shaft seal of a submersible pump motor. A resistive probe is installed in the seal cavity. If water leaks into the pump, the resistance measured by the probe decreases. When the resistance drops below the sensitivity setpoint, the unit will trip and the relay contacts will change state. Output relay logic can be reversed by removing an external jumper. The unit will automatically reset when a fault is cleared.

460-15-100-SLD 1-Channel Seal Leak Detector, 110 to 120 V AC, LED Indicator

MFR: Littelfuse

MFR #: 460-15-100-SLD

UPC: 079458990546

Item #: 819808

Littelfuse

460-VBM Symcom MotorSaver 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 460-VBM

UPC: 079458990645

Item #: 1012979

Littelfuse

The 777/ 77C is a fully programmable electronic overload relay designed to protect any motor drawing 2-800 full load amps (external CTs are required above 90 amps). The 777-HVR-SP and 77C (family of products) are for single-phase 100-240VAC applications. Common applications include conveyor systems, HVAC equipment, saws and grinders, fan motors, and almost any pumping application. All of the overload relays provide unsurpassed protection by combining overload, underload, and voltage in one package. For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time operational information and displaying diagnostic codes to aid in troubleshooting a fault condition. The units also feature a communications port that can be used with communication modules listed in the 777 accessories section to form a Modbus, DeviceNet, Profibus, or Ethernet network. Up to 99 units can be remotely monitored and controlled from a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions software. This capability allows for a simple, cost-effective way to meet new requirements for arc-flash safety.

77C 1-Phase Overload Relay, 1 Form C SPDT Contact

MFR: Littelfuse

MFR #: 77C

UPC: 079458991192

Item #: 1261620

Littelfuse

460-L Symcom Phase Monitoring Relay, 190 to 480 V AC, 1 Form C Contact

MFR: Littelfuse

MFR #: 460-L

UPC: 079458990607

Item #: 1148856

Littelfuse

3Ph Vm/380-480V/Adj.Vub,Td,Rd/2X480V Rly

MFR: Littelfuse

MFR #: 355-400-5

UPC: 079458989915

Item #: 876387

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777-P2 Fully Programmable Overload Relay, 2 to 20 A, 1 Form C SPDT Contact Form

777-LR-P2 3-Phase Overload Relay, 1 Form C SPDT Contact

102A3 102A 3-Phase Monitor, 190 to 480 V AC, 10 A, 1 Form C SPDT Contact

102A Symcom 3-Phase Phase Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

3-Phase Plug-In Voltage Monitor 190-480Vac, 50/60Hz

601 Monitor, 250 V, 6.3 A

460-B 3-Phase Monitor, 190 to 480 V AC, 10 A, 1 Form C Contact

460-100-SP 1-Phase Voltage Monitor, 95 to 120 V AC, 10 A

455 Symcom 3-Phase Dual Range Voltage Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

250A Symcom 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 2 Form C DPDT Contact

355-400 Symcom 3-Phase Voltage Monitoring Relay, 475 to 600 V AC, 1 Form C SPDT Contact

460-15 Symcom MotorSaver 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 1NO 1 Form A SPST Contact

350-400-2-5 Symcom 3-Phase Fixed Trip Heavy Duty Variable Restart Delay Voltage Monitoring Relay, 380 to 480 V AC, DPDT Contact

201A-9 Symcom MotorSaver 3-Phase Auto Ranging Dual Range Voltage Monitoring Relay, 190 to 480 V AC, 8 Pin, 1 Form C SPDT Contact

460-15-100-SLD 1-Channel Seal Leak Detector, 110 to 120 V AC, LED Indicator

460-VBM Symcom MotorSaver 3-Phase Voltage Monitoring Relay, 190 to 480 V AC, 1 Form C SPDT Contact

77C 1-Phase Overload Relay, 1 Form C SPDT Contact

460-L Symcom Phase Monitoring Relay, 190 to 480 V AC, 1 Form C Contact

3Ph Vm/380-480V/Adj.Vub,Td,Rd/2X480V Rly