Datasheet > 77C-LR-KW/HP

77C-LR-KW/HP

更新时间： 2024-11-06 14:56:43

品牌	Logo	应用领域
力特 - LITTELFUSE		电机监控电流互感器
页数	文件大小	规格书
5页	304K
描述
77C-LR-KW/HP单相电流和电压监控器提供100-240V交流电压保护和1-9A电机满载电流保护（外部电流互感器要求高于9A）。

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77C-LR-KW/HP 数据手册

Motor and Pump Protection Relays

77C-KW Series

Single-Phase Current & Voltage Monitor

Power is Linear, equal

Current is not linear, low

sensitivity for low loads

and high sensitivity

for high loads.

sensitivity at both

low and high

loads.

No Load

Full Load

No Load

Full Load

Description

The 77C-KW single-phase relay is part of the 777/77C product family. The 77C-KW, 77C-KW/HP and 77C-LR-KW/HP

are fully programmable pump protection relays that monitor for high or low voltage and overload and underload conditions

based on power. These overload relays are designed to protect any motor drawing 2–800 full load A (external CTs are

required above 90 A). The 777-HVR-SP and 77C are for single-phase 100–240 V ac applications.

All of the overload relays provide unsurpassed protection by combining overload, underload, and voltage in one unit.

For standalone applications, the units incorporate a 3-digit LED display that is used for programming, providing real-time

operational information, and displaying diagnostic codes to aid in troubleshooting a fault condition.

The units also feature a network communications port that can be used with communication modules, listed in the 777

accessories section, to form a Modbus*, DeviceNet^™, Profibus, or Ethernet network. Up to 99 units can be remotely

monitored and controlled from a PC, PLC, or SCADA system, and data logging through a PC with the optional Solutions

software. This capability allows for a simple, cost-effective way to meet new requirements for arc-flash safety.

The underpower trip feature is desirable anytime the current vs. load characteristic is non-linear or has little change.

In general terms, smaller motors and slow-speed motors have little change in current over the normal load range. Larger

motors that are running light loads will also show small current changes over the operating load range. Common uses

include pumping applications where motors run slower than 3400 rpm and usually have small current versus load changes,

such as slow speed mixers or agitator motors up to 50 hp, mag-drives, or can pumps.

Note: The Littelfuse PumpSaver^®relay provides the high sensitivity of a power monitor to protect pump motors from dry run and dead head conditions.

*Compatible with Modbus using optional communications module (RS485MS-2W).

Features & Beneﬁts

FEATURES

BENEFITS

Increases reliability for non-linear motors where the load

characteristic has little change

Underload protection

Visual indication for programming, viewing real-time voltage, current,

kilowatts or horsepower, and last fault code

Built-in display

Allows user flexibility to fine tune the relay for maximum protection

with any application

15 programmable criteria settings

Last fault memory

Provides instant troubleshooting diagnostics

Increases safety through remote display of real-time data and fault

history. Aids with arc-flash safety regulations.

Remote display compatibility

Reset options: automatic, manual using pushbutton on relay, or remote

with optional 777-MRSW or OL-RESET remote reset kit.

Flexible reset

Littelfuse.com/77C-KW

Speciﬁcations are subject to change without notice.

1 of 5

Revised: 12/08/2022

12 3 4 5

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与77C-LR-KW/HP相关器件

型号	品牌	获取价格	描述	数据表
77D2-SERIES	ETC	获取价格	Optoelectronic
77D3-SERIES	ETC	获取价格	Optoelectronic
77D5-SERIES	ETC	获取价格	Optoelectronic
77D6-SERIES	ETC	获取价格	Optoelectronic
77D8-SERIES	ETC	获取价格	Optoelectronic
77DA15P1APNVF2	AMPHENOL	获取价格	CONNECTOR,D-SHELL,PCB MNT,RECEPT,15 CONTACTS,PIN,0.108 PITCH,R ANGLE PC TAIL TERMINAL,HOLE
77D-A-15-P-1ATN	AMPHENOL	获取价格	D Type Connector, 15 Contact(s), Male, 0.109 inch Pitch, Solder Terminal, Hole .112-.124,
77DA15P1ATNVF2	AMPHENOL	获取价格	CONNECTOR,D-SHELL,PCB MNT,RECEPT,15 CONTACTS,PIN,0.108 PITCH,R ANGLE PC TAIL TERMINAL,HOLE
77D-A-15-P-1AUN	AMPHENOL	获取价格	D Type Connector, 15 Contact(s), Male, 0.109 inch Pitch, Solder Terminal, Hole .112-.124,
77D-A-15-P-A4RM6	AMPHENOL	获取价格	D Subminiature Connector, 15 Contact(s), Male, Solder Terminal, Receptacle,

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