Datasheet > 201A-AU-OT

201A-AU-OT

更新时间： 2023-12-06 20:09:13

品牌	Logo	应用领域
力特 - LITTELFUSE		/
页数	文件大小	规格书
3页	368K
描述
This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase

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201A-AU-OT 数据手册

Voltage Monitoring Relays

201A-AU Series

3-Phase Voltage/Phase Monitor

Description

The 201A-AU 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. Additional adjustment knobs allow the user to set a 1–30 second trip delay,

a manual restart or 1–500 second restart delay, and a 2–8% voltage unbalance trip point. 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 (or manual reset).

Features & Beneﬁts

FEATURES

BENEFITS

Constant monitoring of loss of any phase, low-voltage, high-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

Quick visual indicator for cause of trip

Allows flexibility in panel installation

Compact design for 8-pin; DIN-rail or surface mount

Allows compatibility with a variety of motors and reduces

nuisance tripping

Adjustable voltage unbalance trip setting

Adjustable trip and restart delay settings

Prevents nuisance tripping due to rapidly fluctuating power

line conditions.

Applications

• Fan motors

• Air conditioners

• Compressors

• Heat, well, and sump pumps

• Small conveyer motors

Littelfuse.com/201A-AU

Speciﬁcations are subject to change without notice.

1 of 3

Revised: 07/13/2023

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