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250A

更新时间: 2024-11-06 14:56:43
品牌 Logo 应用领域
力特 - LITTELFUSE /
页数 文件大小 规格书
3页 276K
描述
This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase

250A 数据手册

 浏览型号250A的Datasheet PDF文件第2页浏览型号250A的Datasheet PDF文件第3页 
Voltage Monitoring Relays  
250A Series  
3-Phase Voltage/Phase Monitor  
Description  
The 250A 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 offers protection from low- and high-voltage, voltage unbalance, single-phase, and  
phase reversal. The 250A provides a user-selectable nominal voltage setpoint and will automatically select between the  
200 V and 400 V range. This monitor also features adjustable or manual restart delay.  
This unique microcontroller-based voltage and phase-sensing device 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. The 250A monitor  
includes advanced, single LED diagnostics. Five different light patterns distinguish between faults and normal conditions.  
LED indications include normal operation, power-up restart delay, reverse-phase trip, unbalance/single-phase trip, and high/  
low voltage trip.  
*Note: 50 Hz will increase all delay timers by 20%.  
Features & Benefits  
FEATURES  
BENEFITS  
Constant monitoring of single-phase, low-voltage, voltage unbalance,  
phase reversal, harmful power line conditions  
Proprietary microcontroller-based circuitry  
Automatically senses system voltage between 190–480 V ac.  
Saves setup time  
Auto-sensing wide voltage range  
Advanced LED diagnostics  
Adjustable trip delay  
Quick visual indicator for cause of trip  
Prevents nuisance tripping due to rapidly fluctuating power  
line conditions  
DPDT relay output  
Manual reset  
Allows for versatility to meet wide application needs  
Allows for inspection of equipment before system is re-energized  
Applications  
• Fan motors  
• Air conditioners  
• Compressors  
• Heat, well, and sump pumps  
• Small conveyer motors  
Littelfuse.com/250A  
©2023 Littelfuse, Inc.  
Specifications are subject to change without notice.  
1 of 3  
Revised: 07/14/2023  

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