Littelfuse 355400, 355 Series, 3-Phase Voltage/Phase Monitor, Voltage Asymmetry, Voltage Sensing AC 380 ~ 480VAC, SPDT (1 Form C)
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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) |