3554005 - 355 Series

Series: 355
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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 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 and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.

The 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.

The 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.

Property (Mouseover for details) Value
Input Voltage (V) 380 - 480 Vac
Maximum Input Power 6
Input AC Line Frequency (Hz) 50 / 60 (50 will increase all delay timers by 20%)
Output Form DPDT
Output Load Rating (VA) Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A
Restart Delay Range After a Fault or power loss: Manual; 2 - 300 s adjustable
Repeat Accuracy (%) ±0.1%
Trip Delay Range Under/Over and Unbalance Voltage: 2 - 30 s adjustable; single-Phase faults (>25%UB): 2 s
Trip Point Accuracy (%) ±1%
Overvoltage Trip Voltage (%) 110%
Overvoltage Reset Voltage (%) 107%
Undervoltage Trip Voltage 90%
Undervoltage Reset Voltage (%) 93%
Voltage Unbalance Trip Point (%) 2 - 8% adjustable
Voltage Unbalance Reset (%) Trip setting minus 1%
Termination Type Torque: 7 in-lbs; Wire Size: 12 - 18 AWG
Mounting Method #8 screws
Operating Temperature -40° to 70°C (-40° to 158°F)
Storage Temperature (F/C) -40° to 80°C (-40° to 176°F)
Dimensions 2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)
Weight (lbs/g) 0 Kg
Check Stock Yes
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