Littelfuse 202, 202 Series, 3-Phase Voltage Monitor, Voltage Asymmetry, Voltage Sensing AC 190 ~ 480VAC, SPDT (1 Form C)
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The 202 series is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50*/60 Hz motors regardless of size. The 202-RP (and the 202-575-RP for 475–600 V ac) monitors the phase rotation of 3-phase systems and trips on reverse-phase only. Critical applications include fan motors, scroll compressors, grinders, conveyor systems, elevators and escalators. Both products provide a user selectable nominal voltage setpoint and automatically select between the 200 V and 400 V range.
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 MotorSaver’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified amount of restart delay time (or a manual reset). The 202 series includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions. The status light turns green and the relay is activated when rotation is correct.
*Note: 50 Hz will increase all delay timers by 20 %. CE Pending
| Frequency | 50*/60Hz |
| Functional Characteristics | |
| Phase Sequence | ABC |
| Low Voltage (% of setpoint) |
Trip 90% Reset 93% |
| High Voltage (% of setpoint) |
Trip 110% Reset 107% |
| Voltage Unbalance (NEMA) |
Trip 6 % Reset 4.5 % |
| Trip Delay Time |
High and Low Voltage ： 4 seconds Unbalance & Phasing Faults ：2 seconds |
| Restart Delay Time |
After a Fault： Manual, 2–300 seconds adj. After a Complete Power Loss： Manual, 2–300 seconds adj. |
| Output Characteristics | |
| Output Contact Rating (SPDT) |
Pilot Duty： 480 VA @ 240 V ac General Purpose： 10 A @ 240 V ac |
| General Characteristics | |
| Temperature Range | -40° to 70°C (-40° to 158°F) |
| Trip & Reset Accuracy | ±1% |
| Repeatability | ±0.5 % |
| Maximum Input Power | 5 W |
| Relative Humidity | 95 %, non-condensing |
| Transient Protection | IEC 61000-4-5, ±4 kV |
| Hi-potential Test | Meets UL 508 (2x rated V+1000 V for 1 minute) |
| Termination | 0.25” male quick connect |
| Safety Marks | |
| UL Recognized | UL 508 (File #E68520) |
| Dimensions |
H 63.5 mm (2.5”) W 63.5 mm (2.5'') D 35.56 mm (1.4”) |
| Weight | 0.5 lb. (8 oz., 226.8 g) |
| Mounting Method | 1/4” socket head cap screw (customer supplied) |