Littelfuse 201A Voltage/Phase Monitor
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The 201A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The 201A includes advanced single LED diagnostics, where color and different light patterns distinguish between faults and normal conditions.
This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the 201A’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels.
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| Littelfuse 201A 3-Phase Voltage/Phase Monitor |
Features and Benefits
Proprietary microcontroller based circuitry
Compact design for 8-pin; DIN rail or surface mount
Auto-sensing wide voltage range
Advanced LED diagnostics
Specifications
Frequency 50/60Hz
Functional Characteristics
Low Voltage (% of setpoint)
Trip 9 0% ±1%
Reset 9 3% ±1%Voltage Unbalance (NEMA)Trip 6%Reset 4.5%
Optional High Voltage (% of setpoint) Trip 110 % ±1% Reset 10 7% ±1%
Trip Delay Time >> High/Low Voltage Fault 4 seconds
Unbalance & Phasing Faults >> 2 seconds
Restart Delay Time
After a Fault >> 2 seconds
After a Complete Power >> Loss 2 seconds
Output Characteristics
Output Contact Rating (SPDT)
Pilot Duty 480VA @ 240VAC
General Purpose >> 10A @ 240VAC
General Characteristics
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 Gauge >> 12-22 AWG solid or stranded
Transient Protection (Internal) >> 2500V for 10 ms
Standards Passed
Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6kV contact, 8kV airRadio
Frequency Immunity (RFI), Radiated15 0MHz, 10V/m
Fast Transient Burst IEC 61000-4-4, Level 3, 3.5kV input power & controls
Surge
Immunity IEC IEC 61000-4-5, Level 3, 4kV line-to-line;Level 4, 4kV line-to-ground
ANSI/IEEEC62.41 Surge and Ring Wave Compliance to a level of 6kV line-to-line
Hi-potential Test Meets UL508 (2 x rated V + 1000V for 1 min.)
Safety Marks
UL (OT08PC octal socket required) UL508 (File #E68520)
CE IEC 60947-6-2
Dimensions H 44.45 mm (1.75”); W 60.33 mm (2.38”); D (with socket) 104.78 mm (4.13”)
Weight 0.7 lbs. (11.2 oz., 317.51 g)
Mounting Method >> DIN rail or surface mount (plug in to OT08PC socket)
Socket Available Model OT08PC (UL Rating 600V)
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