Home » Littelfuse 355200, 355 Series, 3-Phase Voltage/Phase Monitor, Voltage Asymmetry, Voltage Sensing AC 190 ~ 240VAC, SPDT (1 Form C)
Littelfuse

Littelfuse 355200, 355 Series, 3-Phase Voltage/Phase Monitor, Voltage Asymmetry, Voltage Sensing AC 190 ~ 240VAC, SPDT (1 Form C)

In stock
SKU: 355200
$562.92
Rated voltage
Phase
Contact
⚠️ IMPORT NOTICE
FOR ALL ORDERS OUTSIDE CANADA, CUSTOMERS ARE RESPONSIBLE FOR ANY IMPORT DUTIES, TARIFFS, TAXES, AND CUSTOMS FEES THAT MAY APPLY TO THEIR ORDERS.

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The 355 series is a three-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance, and multiple diagnostic lights. It is ideal for heavy-duty applications that need both protection and simple user-friendly diagnostics. Suitable applications include pump panels, commercial HVAC, oil rigs, and many more. The 355 series uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. It can protect motors from damage caused by single-phasing, high- and low-voltage, phase reversal, and voltage unbalance. These relays have four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase, and normal conditions. The adjustable trip and restart settings prevent nuisance tripping due to rapidly fluctuating power line conditions and allow staggered start-up of multiple motors after a fault to prevent a low-voltage condition.

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

Applications

• Pump panels
• Commercial HVAC
• Oil rigs
• Heavy-duty applications that need both protection and simple user-friendly diagnostics

*Note: 50 Hz will increase all delay times by 20%.

Specifications

Input Characteristics  
Line Voltage (Specify voltage range) 355200     190–240 V ac
355400     380–480 V ac
355600     475–600 V ac
Frequency 50*/60 Hz
Functional Characteristics
Low Voltage (% of setpoint) Trip            90% ±1%
Reset         93% ±1%
High Voltage (% of setpoint) Trip           110% ±1%
Reset        107% ±1%
Voltage Unbalance (NEMA) Trip             2–8% adjustable
Reset          Trip setting minus 1%
Trip Delay Time Low & High Voltage and Unbalance      2–30 seconds adjustable
Single-phasing Faults (>25% UB)           2 seconds
Restart Delay Time After a Fault or Power Loss       Manual, 2–300 seconds adjustable
Output Characteristics
Output Contact Rating
SPDT (355200) Pilot Duty                   480 VA at 240 V ac
General Purpose        10 A
SPDT (355400, 355600) Pilot Duty                    470 VA @ 600 V ac
DPDT (-5 Option) Pilot Duty                    470 VA @ 600 V ac
General Characteristics
Temperature Range Operating     -40° to 70 °C (-40° to 158 °F)
Storage         -40° to 80 °C (-40° to 176 °F)
Repeat Accuracy Fixed Conditions                     ±0.1%
Maximum Input Power           6 W
Terminal Torque 7 in.-lbs.
Wire Size 12–18 AWG
Transient Protection (Internal) 2500 V for 10 ms
Dimensions H 74.42 mm (2.93”)
W 133.86 mm (5.27”)
D 74.93 mm (2.95”)
Weight 0.94 lb. (15.04 oz., 426.38 g)
Mounting Method #8 screws
Special Options Option 5 - DPDT Relay
Certification & Compliance UL      UL 508 (File #E68520)