Datasheet > 250A

250A

更新时间： 2024-11-25 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

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250A 数据手册

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

Speciﬁcations are subject to change without notice.

1 of 3

Revised: 07/14/2023

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