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Siemens 7SJ6321-4EA40-3FA0 Multifunction Protective Relay

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ManufacturerSiemens

Part number7SJ6321-4EA40-3FA0

Case Size 1/2 19"

Binary Inputs 24

Binary Outputs 11

Power Relays 2

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Veteran-owned

CAGE: 9NK75

Multifunction Protection Backlit Graphic Display 14 Programmable LEDs Extensive I/O (24BI/11BO) Overcurrent, Ground Fault, Overload Protection PROFIBUS FMS Communication Wide DC Supply Voltage Range

Product description

The Siemens 7SJ6321-4EA40-3FA0 is a multifunction protective relay housed in a 1/2 19" case, featuring a backlit graphic display and 14 programmable LEDs. It offers extensive binary inputs (24) and outputs (11), along with 2 power relays. The relay supports 3-phase voltage and 4-current measurements with programmable input ranges (IPH = 1A, IE = 1A).

This relay is designed for comprehensive protection of power systems, including functions like phase overcurrent (50/51), ground overcurrent (50N/51N), overload protection (49), trip circuit supervision (74TC), and breaker failure protection (50BF). It supports DC 60V to 125V supply voltage and features a PROFIBUS FMS slave interface (RS 485).

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 7SJ6321-4EA40-3FA0. Sourcing protective relays and other automation components from Stanlo provides a cost-effective solution for maintaining and upgrading your electrical infrastructure.

Technical specifications

Case Size	1/2 19"
Binary Inputs	24
Binary Outputs	11
Power Relays	2
Measurement Inputs	3x U, 4x I
Measuring Input Current	IPH=1A, IE=1A
Supply Voltage	DC 60V to 125V
Communication	PROFIBUS FMS slave (RS 485)

Common applications

Power System Protection

Substation Automation

Motor Protection

Feeder Protection

Generator Protection

Industrial Power Distribution

Electrical Grid Monitoring

Compatible systems

Siemens DIGSI 4 PROFIBUS FMS networks SCADA Systems

Also known as

Siemens 7SJ63 Multifunction Relay 7SJ6321-4EA40-3FA0 Relay Siemens Protection Relay

Replaces / compatible with

This unit is part of the Siemens 7SJ63 series. It can replace older models within the same series or provide enhanced functionality for existing protection schemes. Consult Siemens documentation for specific compatibility.

Technical note

Expert tip

The relay language is set to German by default but is changeable, and it supports IEC standards for power system protection.

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Frequently asked questions

What communication protocol does the Siemens 7SJ6321-4EA40-3FA0 protective relay support?

The Siemens 7SJ6321-4EA40-3FA0 protective relay supports PROFIBUS FMS slave communication via an electrical RS 485 interface, enabling integration into modern industrial networks.