Datasheet > 50R4003

50R4003

更新时间： 2023-12-06 20:12:52

品牌	Logo	应用领域
力特 - LITTELFUSE		/
页数	文件大小	规格书
3页	248K
描述
When a harmful condition is detected, the output relay is deactivated after a specified trip delay

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50R4003 数据手册

Voltage Monitoring Relays

50R Series

Single-Phase Voltage Monitor

Description

The 50R series is a single-phase voltage monitor with a voltage-sensing circuit that constantly monitors the single-phase

power for a low-voltage condition. When a harmful condition is detected, the MotorSaver^®deactivates its output relay after

a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level and a specified

amount of time has elapsed (restart delay). The trip delay prevents nuisance tripping due to rapidly fluctuating power line

conditions. This monitor is used in a variety of applications such as compressors, air conditioners, heat pumps, well pumps,

sump pumps, and small conveyer motors.

Features & Beneﬁts

FEATURES

BENEFITS

Proprietary voltage sensing circuitry

Constant monitoring of single-phase power for a low-voltage condition

Adjustable trip delay (-3 models) and restart delay

(-2 models) settings

Prevents nuisance tripping due to rapidly fluctuating power line

conditions, allows staggered start-up of multiple motors after a fault

Trips and resets at a fixed percentage of the setpoint: trip 110%,

reset 107%

High-voltage detection (-9 models)

Eliminates the need for a control transformer to step voltage down

to 120–240 V for a control circuit

600 V rated relay contacts available on some models

Applications

• Fan motors

• Air conditioners

• Compressors

• Heat, well, and sump pumps

• Small conveyer motors

Littelfuse.com/50R

Speciﬁcations are subject to change without notice.

1 of 3

Revised: 07/11/2023

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