350 Series - 3-Phase Voltage/Phase Monitor

Series: 350
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

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.

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)Input AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Overvoltage Reset Voltage (%)Overvoltage Trip Voltage (%)Restart Delay RangeStorage Temperature (F/C)Trip Delay RangeTrip Point Accuracy (%)StockCompare
350200190 - 240 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 15 AAfter a Fault: 2 s; After a Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
3502002190 - 240 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 15 AManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35020026190 - 240 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 1 - 10 A and Pilot Duty: 480 VA and 240 Vac; General Purpose: 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35020028190 - 240 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 2 - 15 A and 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35020029190 - 240 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 15 A107%110%Manual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
350400380 - 480 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 AAfter a Fault: 2 s; After a Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
3504002380 - 480 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 AManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35040025380 - 480 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 2 - 10 AManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35040026380 - 480 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 1 - 10 A and Pilot Duty: 480 VA and 240 Vac; General Purpose: 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35040028380 - 480 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 2 - 15 A and 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35040029380 - 480 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 15 A107%110%Manual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
350600475 - 600 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 AAfter a Fault: 2 s; After a Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
3506002475 - 600 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 AManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35060026475 - 600 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 1 - 10 A and Pilot Duty: 480 VA and 240 Vac; General Purpose: 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35060028475 - 600 VacDPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 2 - 15 A and 1 hp @ 240 VacManual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4 s; Unbalance/Phase faults: 2 s±1%Check
35060029
Obsolete: 2020 -09-21		475 to 600VACSPDTTorque: 7in-lbs; Wire Size: 12-18AWG#8 screws2.93 in H x 5.27 in W x 2.95 in D (74.4 x 133.9 x 74.9 mm)1.1 lbs (16.8 oz. 476.3g)5WPilot Duty: 470VA @ 600VAC; General Purpose: 15A107%110%Manual 2 - 300s adjustable-40° to 80°C (-40° to 176°F)Under Voltage: 4s; Unbalance and Phasing Faults: 2s±1%
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