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Protection Relays & Controls

CT1 CT2

GROUNDED

AC SUPPLY

EL731 SERIES

(AC/DC Sensitive

Earth-Leakage Relay)

CT1

EL731 SERIES

(AC/DC Sensitive

Earth-Leakage Relay)

GROUNDED

DC SUPPLY

–

Description

The EL731 is

a microprocessor-based AC/DC Sensitive

Earth-Leakage Relay that offers complete coverage for all

frequencies from 0-6,000 Hz. Two CTs are required for the

entire frequency range, or one CT can be used for only low-

or high-frequency detection. An RTD/PTC sensor input

allows over-temperature protection. The EL731 offers

metering capabilities, password-protected alarm and trip

settings and optional network communications. It is used to

add low-level ground-fault protection to variable-speed

drives, and to dc currents.

EL731 SERIES

AC/DC Sensitive Earth-Leakage Relay

ORDERING NUMBER

CONTROL

POWER

COMMUNICATIONS

EL731-00-X0

120/240 Vac/Vdc None

EL731-01-X0 120/240 Vac/Vdc DeviceNet

™

EL731-02-X0 120/240 Vac/Vdc Proﬁbus

EL731-03-X0 120/240 Vac/Vdc EtherNet/IP

™

EL731-04-X0 120/240 Vac/Vdc Modbus

TCP

EL731-10-X0 48 Vdc & 24 Vac None

EL731-11-X0 48 Vdc & 24 Vac DeviceNet

™

EL731-12-X0 48 Vdc & 24 Vac Proﬁbus

EL731-13-X0 48 Vdc & 24 Vac EtherNet/IP

™

EL731-14-X0 48 Vdc & 24 Vac Modbus

TCP

EL731-20-X0 24 Vdc None

EL731-21-X0 24 Vdc DeviceNet

™

EL731-22-X0 24 Vdc Proﬁbus

EL731-23-X0 24 Vdc EtherNet/IP

™

EL731-24-X0 24 Vdc Modbus

TCP

Ordering Information

Simpliﬁed Circuit Diagram

ACCESSORIES REQUIREMENT

EFCT Series CT One Required

AC700-CUA Series Com. Unit Optional

AC700-SMK Surface-Mount Kit Optional

Accessories

EFCT Series Earth-Fault Current Transformer

Required zero-sequence current transformer

speciﬁcally designed for low level detection.

AC700-CUA Series

Communication Adapter

Optional network-interface and ﬁrmware-

upgrade communications adapters ﬁeld-install

in EL731.

AC700-SMK DIN-rail & Surface-mount

Adapter

EL731 plugs into adapter for back-plane

mounting.

A A

AC Mode DC Mode

Earth-Leakage Protection–Grounded AC or DC Systems

Rev: 4-D-071813

Based on Manual Rev 6-A-042613

Littelfuse.com/el731

Note: When building a part number, replace the “X” with “1” for AS/NZS 2081:2011 Compliant product, “0” otherwise.

For detailed wiring diagram, see adjacent page.

1 2

EL731 SERIES 1

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Littelfuse EL731 Series Bedienungsanleitung

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