Home » Littelfuse 201A, 201A Series, 3-Phase Voltage/Phase Monitor, Voltage Asymmetry, Voltage Sensing AC 190 ~ 480VAC, DIN-rail or surface mountable
Littelfuse

Littelfuse 201A, 201A Series, 3-Phase Voltage/Phase Monitor, Voltage Asymmetry, Voltage Sensing AC 190 ~ 480VAC, DIN-rail or surface mountable

In stock
SKU: 201A
$225.66
Rated voltage
Phase

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The 201A series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50*/60 Hz motors regardless of their size. This monitor provides a user-selectable nominal voltage setpoint and will automatically select between the 200 V and 400 V range. It includes advanced, single LED diagnostics where color and light patterns distinguish between faults and normal conditions. This unique microcontroller-based voltage and phase-sensing unit constantly monitors the three-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified restart delay time.

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

Frequency 50*/60Hz
Functional Characteristics
Low Voltage (% of setpoint) Trip                 90%±1%
Reset               93%±1%
Voltage Unbalance (NEMA) Trip                  6%
Reset               4.5%
Optional High Voltage (% of setpoint) Trip                 110% ±1%
Reset              107% ±1%
Trip Delay Time Low/High Voltage   4 seconds (standard)
Unbalance & Phasing Faults  2 seconds
Restart Delay Time After a Fault     2 seconds (standard)
After a Complete Power Loss   2 seconds (standard)
Output Contact Rating (SPDT)

 		Pilot Duty                  480 VA @ 240 V ac
General Purpose        10 A @ 240 V ac
General Characteristics
Ambient Temperature Range -20° to 70 °C (-4° to 158 °F)
Trip & Reset Accuracy ±1%
Maximum Input Power 5 W
Relative Humidity 10–95%, non-condensing per IEC 68-2-3
Terminal Torque 12 in.-lbs. (for OT08-PC socket)
Wire Size 12–22 AWG solid or stranded
Transient Protection (Internal) 2500 V for 10 ms
Standards Passed

Electrostatic Discharge (ESD)  IEC 61000-4-2, Level 3, 6 kV contact, 8 kV air
Radio Frequency Immunity
(RFI), Radiated          150 MHz, 10 V/m
Fast Transient Burst   IEC 61000-4-4, Level 3, 3.5 kV input power & controls
Dimensions H 44.5 mm (1.75”)
W 60.3 mm (2.38'')
D 104.8 mm (4.13”)
Mounting Method #6 screws
Certification & Compliance UL        UL508 (File #E68520)