TVW8510S0.4S - TVW Series

Series: TVW
Obsolete: 2020 -10-05
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Littelfuse Voltage Monitoring Relays
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The TVW Series provides protection for motors and other sensitive loads. Continuously measures the voltage of each of the three phases using a microcontroller circuit design that senses under and overvoltage, voltage unbalance, phase loss, and phase reversal. Protection is provided even when regenerated voltages are present. Includes a trip delay to prevent nuisance tripping and a restart delay to prevent short cycling after a momentary power outage.

Upon application of line voltage, the restart delay begins. The output is de-energized during restart delay. Under normal conditions, the output energizes after the restart delay. Undervoltage, overvoltage, and voltage unbalance must be sensed for the complete trip delay period before the output de-energizes. The restart delay begins as soon as the output de-energizes. If the restart delay is completed when a fault is corrected, the output energizes immediately. The output will not energize if a fault is sensed as the input voltage is applied. If the voltage selector is set between two voltage marks (i.e. between 220 and 230V), the LED will flash red rapidly. The TVW provides fault protection at the lower of the two line voltages (i.e. 220V).
Reset: Reset is automatic upon correction of a fault.

Property (Mouseover for details) Value
Input Voltage (V) 380 400 and 415VAC
Input Tolerance (%) -0.5
Input Type 3-phase delta or wye with no connection to neutral
Input Phase Sequence ABC
Output Type Isolated SPDT
Output Load Rating (VA) 10A resistive @ 240VAC; 1/4hp @ 125VAC; 1/3hp @ 250VAC; max voltage 277VAC
Reset Time (ms) Automatic
Response Time (ms) Phase loss: ≤200ms; Phase reversal: ≤200ms
Restart Delay Range 0.4s fixed
Restart Delay Tolerance (%) ±15% or ±0.2s whichever is greater
Trip Delay Range 10s fixed
Trip Delay Tolerance (%) ±15% or ±0.1s whichever is greater
Trip Delay vs Temperature Trip variation: ≤±2%
Overvoltage Trip Voltage (%) 109 - 113% of the adjusted line voltage
Overvoltage Reset Voltage (%) ≅-3% of the trip voltage
Undervoltage Trip Voltage 88-92% of the adjusted line voltage
Undervoltage Reset Voltage (%) ≅+3% of the trip voltage
Voltage Unbalance Trip Point (%) 5% fixed
Voltage Unbalance Reset (%) ≅-0.7% unbalance
Phase Loss ≥25% unbalance
Power Consumption ≅3W
Dielectric Breakdown ≥2500V RMS input to output terminals
Surge Protection IEEE C62.41-1991 Level B
Type of Detection Voltage detection with delayed trip and automatic reset
Life Mechanical - 1 x 106; Electrical - 1 x 105
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Suface mount with one #8 (M5 x 0.8) screw
Operating Temperature -40° to 55°C (-40°F to 131°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Humidity 95% relative non-condensing
Dimensions 2.00 x 2.00 x 1.25 in. (50.8 x 50.8 x 31.8mm)
Weight (lbs/g) ≅2.8oz (79g)
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