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رله حفاظتی زیمنس SIPROTEC 4، دستگاه عرض کامل (1/1) با نمایشگر گرافیکی و کلیدهای کنترل، نمای سه‌رخ

© Siemens AG

siprotecSeries SIPROTEC 4Phase-out

Siemens SIPROTEC 4 digital protection relays

SIPROTEC 4

The previous generation of Siemens digital protection relays for feeders, lines, transformers, generators and busbars; most families have been out of production since 30 September 2024 and SIPROTEC 5 is their successor

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Price and delivery time are given after a technical review.

Production status: Phase-out

According to SiePortal (the Industry Mall's successor, checked on 2 November 2026), one article was checked for each of nine of the 16 SIPROTEC 4 families still listed in its catalog tree. Eight show the lifecycle status "Prod. Cancellation": Siemens announced the phase-out on 30 September 2022 and cancelled production on 30 September 2024 (7SS52 bay unit: 31 March 2024). These articles are labelled "Spare Part" and each names a SIPROTEC 5 successor: 7UT613 to 7UT85/86/87, 7UM62 to 7UM85, 7SA522 to 7SA82/86/87, 7SA61 to 7SA82, 7SD522 to the line differential devices 7SD8x and 7SL8x, 7VK61 to 7VK87, 6MD66 to the modular 6MD8, and 7SS52 to 6MU85 and the SIPROTEC 5 modular devices. The ninth, 7SJ66 (7SJ6611-5EB90-1FA0), is still an "Active Product" with no phase-out date and no successor. The other seven families (7SJ64, 7SA63, 7SA64, 7SD610, 7UT63, 7VE6 and 7VU68) were not checked. The whole family is therefore recorded as phase-out, not discontinued: production of most devices has stopped but one family is still on sale. No end date for spare-parts supply appears on the pages; for an existing installation ask Siemens or your distributor about stock and the spares period, and for a new project start from SIPROTEC 5.

Checked on Nov 2, 2026

Suggested successor

  1. Siemens SIPROTEC 4 digital protection relaysPhase-out
    Siemens SIPROTEC 5 digital protection relaysActive

A suggested successor is not an exact equivalent; the right model depends on your application.

Overview

Overview

SIPROTEC 4 is the previous generation of Siemens digital protection relays for substations. The family covers overcurrent and motor protection (7SJ), distance protection (7SA), line differential protection (7SD), transformer differential protection (7UT), generator and motor protection (7UM), busbar protection (7SS), breaker management (7VK), paralleling devices (7VE), high-speed busbar transfer (7VU) and bay controllers (6MD). Each device is a numerical relay in a fixed housing; its functions, number of inputs and outputs and communication ports are set by the order number (MLFB).

Read more

The current generation is SIPROTEC 5. In SiePortal, Siemens names a SIPROTEC 5 successor for every SIPROTEC 4 family that was checked, except 7SJ66.

How to tell which generation you hold

The device type is printed on the housing and the full order number is on the label on top of the case. Types such as 7SJ64, 7SJ66, 7SA522, 7SA61, 7SD5, 7UT613, 7UM62, 7SS52, 7VK61 and 6MD66 are SIPROTEC 4 and are set with DIGSI 4. Types such as 7SJ85, 7SA87, 7UT85, 7UM85 and 7SS85, or the compact 7SX800, are SIPROTEC 5 and are set with DIGSI 5.

Protection functions

The functions of a device depend on its order number. The 7SJ63 manual (multifunction protection with local control) lists: time-overcurrent for phase and ground (50, 50N, 51, 51N), directional overcurrent (67, 67N), breaker failure (50BF), negative sequence (46), thermal overload (49), under- and overvoltage (27, 59), under- and overfrequency (81O/U), automatic reclosing (79) and, for motors, starting time supervision (48), start inhibit (66/68) and undercurrent (37). The distance (21), transformer (87T) and line (87L) differential and busbar (87B) families carry their own main functions; the exact table for each type is in that device's manual.

Communication and software

According to the 7SJ63 manual, the system-interface protocols are IEC 60870-5-103, PROFIBUS FMS and DP, Modbus and DNP3.0 over RS232, RS485 or optical fibre, and IEC 61850 is added with the EN100 Ethernet module. The relay is set with DIGSI 4, through the PC port on the front panel or an optional service port on the rear. DIGSI 4 is still an "Active Product", and an upgrade path from DIGSI 4 Professional to DIGSI 5 Standard exists.

Hardware

Housing widths are 1/3, 1/2 or 1/1 of 19 inches; mounting is flush or surface; terminals are screw type (ring lugs) or plug-in; displays are text or graphical, and surface-mounted versions have a detached operator panel. Unlike modular SIPROTEC 5, the housing, inputs and outputs and ports of each device are fixed when it is ordered.

Production status and successor

Most families show the status "Prod. Cancellation" in SiePortal (production cancelled on 30 September 2024, and on 31 March 2024 for the 7SS52 bay unit) and are offered as spare parts only. 7SJ66 was still active when checked. The detail and the successor of each family are in the lifecycle section.

Features

  • Families by application: overcurrent and motor (7SJ), distance (7SA), line differential (7SD), transformer differential (7UT), generator (7UM), busbar (7SS), bay controller (6MD)
  • Protection functions with ANSI numbers, such as 50/51, 67, 49, 46, 50BF and 79 in the example device 7SJ63
  • IEC 60870-5-103, PROFIBUS, Modbus and DNP3.0 protocols, and IEC 61850 with the EN100 module
  • Set with DIGSI 4 through the PC port on the front or the service port on the rear
  • Housing of 1/3, 1/2 or 1/1 x 19 in, flush or surface mounting, screw or plug-in terminals
  • Housing, inputs and outputs, ports and function version are fixed by the order number
  • For every family checked except 7SJ66, a SIPROTEC 5 successor is named in SiePortal
  • Serial protection communication between SIPROTEC 4 and SIPROTEC 5 line relays (in the 7SA87 and 7SL87)

Advantages

  • For existing installations, SiePortal labels the devices "Spare Part" and points to its spares and service section
  • DIGSI 4 is still active, and an upgrade path from DIGSI 4 Professional to DIGSI 5 Standard exists
  • On line relays, protection communication with SIPROTEC 5 is possible, which makes a staged migration easier
  • The successor of each family is named in SiePortal, which simplifies choosing a replacement

Models and codes

Models and codes
ModelOrder codeCode typeAttributesRequest
SIPROTEC 7UT613رلهٔ دیفرانسیل ترانسفورماتور (سه‌سیم‌پیچه و باسبار)، بدنهٔ ۱/۲ × ۱۹ اینچ، نصب توکار با ترمینال پیچی (حلقه‌ای)، ورودی جریان 11I و IEE با جریان نامی ۱ آمپر، ۵ ورودی و ۸ خروجی باینری، تغذیهٔ ۲۴ تا ۴۸ ولت DC، درگاه B از نوع Modbus RS485 و درگاه C برای DIGSI 4؛ تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 7UT85/86/877UT6131-2EB91-1AA0 L0DExact code
Housing:
1/2 x 19 in, flush mounting, screw terminals
Current inputs:
11I, IEE, 1 A
Binary I/O:
5 BI, 8 BO
Auxiliary supply:
DC 24 V to 48 V
Port B:
Modbus RS485
Port C:
DIGSI 4, RS232
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 7UT85/86/87
Request SIPROTEC 7UT613
SIPROTEC 7UM62حفاظت چندمنظورهٔ ماشین با عملکرد پایهٔ ژنراتور، بدنهٔ ۱/۲ × ۱۹ اینچ، نصب توکار با ترمینال پیچی، ۷ ورودی و ۱۲ خروجی باینری، تغذیهٔ ۲۴ تا ۴۸ ولت DC، درگاه B از نوع PROFIBUS DP Slave RS485 و درگاه C برای DIGSI 4 و مودم؛ تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 7UM857UM6211-2EB91-0AA0 L0AExact code
Housing:
1/2 x 19 in, flush mounting, screw terminals
Binary I/O:
7 BI, 12 BO
Auxiliary supply:
DC 24 V to 48 V
Port B:
PROFIBUS DP slave, RS485
Port C:
DIGSI 4 / modem, RS232
Functionality:
Generator, basic
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 Machine Protection 7UM85
Request SIPROTEC 7UM62
SIPROTEC 7SJ66رلهٔ حفاظتی چندمنظورهٔ جهت‌دار 7SJ66 با ۴ ورودی جریان و ۴ ورودی ولتاژ و نمایشگر ۸ خطی یا گرافیکی؛ در بررسی ۲ نوامبر ۲۰۲۶ «Active Product» بود (انتشار برای فروش ۲۶ فوریهٔ ۲۰۲۰) و در صفحه تاریخ خروج از تولید یا جانشین نداشت7SJ6611-5EB90-1FA0Exact code
Family:
7SJ66 - 4xI 4xV, 8 line or graphical display, directional
Lifecycle:
Active Product
Sales release:
2020-02-26
Request SIPROTEC 7SJ66
SIPROTEC 7SA522رلهٔ دیستانس کامل (full scheme)، با تریپ تک‌فاز یا سه‌فاز، بدنهٔ ۱/۲ × ۱۹ اینچ با ترمینال پلاگین، ۸ ورودی و ۱۶ خروجی باینری؛ قالب کد پیکربندی‌پذیر در SiePortal، کد واقعی از روی برچسب دستگاه تعیین می‌شود. تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 7SA82، 7SA86 و 7SA877SA5221…Example code
Housing:
1/2 x 19 in, flush mounting, plug-in terminals
Binary I/O:
8 BI, 16 BO
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 7SA82, 7SA86 (3-pole), 7SA87 (1-/3-pole)
Request SIPROTEC 7SA522
SIPROTEC 7SA61رلهٔ حفاظت دیستانس 7SA61 با تریپ تک‌فاز یا سه‌فاز و نمایشگر متنی؛ قالب کد پیکربندی‌پذیر در SiePortal. تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 7SA827SA610…Example code
Family:
7SA61 - 4xI 4xV, text display, 1-/3-pole tripping
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 distance protection 7SA82
Request SIPROTEC 7SA61
SIPROTEC 7SD522رلهٔ دیفرانسیل خط دوترمیناله از خانوادهٔ 7SD5؛ قالب کد پیکربندی‌پذیر در SiePortal. تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین دستگاه‌های دیفرانسیل خط SIPROTEC 5 با نام‌های 7SD8x و 7SL8x7SD522…Example code
Family:
7SD5 - 4xI 4xV, up to 6 ends, distance protection, 1-/3-pole tripping
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 Line Diff. Protection 7SD8x; 7SL8x
Request SIPROTEC 7SD522
SIPROTEC 7VK61رلهٔ مدیریت کلید قدرت (Breaker Management) با نمایشگر متنی؛ تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 7VK877VK6101-5AB02-4YN0Exact code
Family:
7VK61 - 4xI 4xV, text display
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 breaker management 7VK87
Request SIPROTEC 7VK61
SIPROTEC 7SS52 bay unitواحد فیدر (Bay Unit) از حفاظت باسبار توزیع‌شدهٔ 7SS52 با حداکثر ۴۸ فیدر؛ تولید از ۳۱ مارس ۲۰۲۴ متوقف شده، جانشین 6MU85 و دستگاه‌های مدولار SIPROTEC 57SS5255-5FA01-0AA1Exact code
Family:
7SS52 - 48 feeders (max), text display, decentralized
Article text:
BUSBAR PROTECTION/BAY UNIT V3.*
Lifecycle:
Prod. Cancellation 2024-03-31
Successor:
SIP 5 merging unit 6MU85, SIP 5 modular devices
Request SIPROTEC 7SS52 bay unit
SIPROTEC 6MD66کنترلر فیدر ولتاژ بالا (High Voltage Bay Control Unit) برای شبکه‌های انتقال؛ تولید از ۳۰ سپتامبر ۲۰۲۴ متوقف شده، جانشین 6MD8 مدولار6MD6641-4EB90-0AA0 L0RExact code
Family:
6MD66 - 3xI 4xV, for transmission grids
Article text:
HIGH VOLTAGE BAY CONTROL UNIT
Lifecycle:
Prod. Cancellation 2024-09-30
Successor:
SIP 5 bay controller 6MD8 modular
Request SIPROTEC 6MD66

Technical specifications

Check the specifications against the data sheet of the exact code before ordering.
نسل و وضعیت
SuccessorSuccessorSIPROTEC 5
Families listed in SiePortalFamilies listed in SiePortal16
Phase-out announcedPhase-out announced2022-09-30
Production cancelled (Prod. Cancellation)Production cancelled (Prod. Cancellation)2024-09-30 (7SS52 bay unit: 2024-03-31)
Family found still activeFamily found still active7SJ66 (7SJ6611-5EB90-1FA0), sales release 2020-02-26
خانواده‌ها بر اساس کاربرد
Overcurrent and motor protectionOvercurrent and motor protection7SJ64, 7SJ66
Distance protectionDistance protection7SA522, 7SA61, 7SA63, 7SA64
Line differential (and distance) protectionLine differential (and distance) protection7SD5, 7SD610
Breaker managementBreaker management7VK61
Transformer differential protectionTransformer differential protection7UT613, 7UT63
Motor and generator protectionMotor and generator protection7UM62
Paralleling deviceParalleling device7VE6
High-speed busbar transferHigh-speed busbar transfer7VU68
Busbar protectionBusbar protection7SS52
Bay controllerBay controller6MD66
توابع حفاظتی (نمونهٔ 7SJ63)
Time-overcurrent, phase and groundTime-overcurrent, phase and ground50, 50N, 51, 51N
Directional overcurrentDirectional overcurrent67, 67N
Breaker failureBreaker failure50BF
Negative sequenceNegative sequence46
Thermal overloadThermal overload49
Under- and overvoltageUnder- and overvoltage27, 59
Under- and overfrequencyUnder- and overfrequency81O/U
Automatic reclosingAutomatic reclosing79
Motor functionsMotor functions48 (starting time), 66/68 (start inhibit), 37 (undercurrent)
Sensitive ground-fault protectionSensitive ground-fault protection50Ns, 67Ns, 64
ارتباطات
System-interface protocols (7SJ63 example)System-interface protocols (7SJ63 example)IEC 60870-5-103, PROFIBUS FMS, PROFIBUS DP, Modbus, DNP3.0
IEC 61850IEC 61850With the EN100 Ethernet module
Example ports on 7UT6131-2EB91-1AA0Example ports on 7UT6131-2EB91-1AA0Port B Modbus RS485; Port C DIGSI 4, RS232
Local and service portLocal and service port9-pin PC port on the front; optional rear service port RS232, RS485 or optical
ساختار سخت‌افزار
Housing width (7SJ63)Housing width (7SJ63)1/2 and 1/1 x 19 in
Housing width (7SJ66)Housing width (7SJ66)1/3 x 19 in
MountingMountingFlush mounting; surface mounting (with detached operator panel on some versions)
TerminalsTerminalsScrew type (ring lugs) or plug-in
How the configuration is setHow the configuration is setBy positions of the order number (housing, I/O, rear ports, function version)
Auxiliary supply (7UT6131 example)Auxiliary supply (7UT6131 example)DC 24 V to 48 V, binary-input threshold DC 19 V
مهندسی
Commissioning softwareCommissioning softwareDIGSI 4 (7XS5402-0AA00 Professional, Active Product)
Upgrade path to DIGSI 5Upgrade path to DIGSI 5P1X471 (DIGSI 4 Professional to DIGSI 5 Standard)

Modules and accessories

  • DIGSI 4 Professional (7XS5402-0AA00)

    Engineering software for configuring and setting SIPROTEC 2 to SIPROTEC 4 relays, the complete version with all option packages; an "Active Product" in SiePortal

  • SIPROTEC 4 front unit with graphic display (C53207-A406-D336-1)

    Front unit with a graphic display for the 1/2 x 19 in housing, US version, for 6MD63, 6MD66, 7SA631, 7SA641, 7SA642, 7SJ63, 7SJ64, 7SJ65, 7UM62, 7SD5 and 7VE63 built after 2006; an "Active Product" in SiePortal

  • Communication converter 7XV5662-0AC02

    Communications converter for control cable (pilot wire): couples SIPROTEC 4 (7SD52, 7SD610, 7SA52, 7SA61) and SIPROTEC 5 relays to a 2-core pilot wire cable of up to 10 km

Documents

Official manufacturer links

Applications

  • Feeder and motor protection in distribution and industrial substations (7SJ)
  • Distance and differential protection of lines (7SA, 7SD)
  • Differential protection of transformers and busbars (7UT)
  • Protection of generators and large machines (7UM)
  • Decentralized busbar protection with a central unit and bay units (7SS52)
  • Bay control, breaker management and paralleling (6MD, 7VK, 7VE)

Frequently asked questions

How do I tell whether my relay is SIPROTEC 4 or SIPROTEC 5?

The device type is on the housing and the full order number is on the label on top of the case. Types such as 7SJ64, 7SJ66, 7SA522, 7SA61, 7SD5, 7UT613, 7UM62, 7SS52, 7VK61 and 6MD66 are SIPROTEC 4 and are set with DIGSI 4. Types such as 7SJ85, 7SA87, 7UT85, 7UM85 and 7SS85, or 7SX800, are SIPROTEC 5 and are set with DIGSI 5. If your type is in neither list, send the full order number to be checked.

Can SIPROTEC 4 still be bought new?

It depends on the family. In SiePortal (checked on 2 November 2026) eight of the nine families checked showed "Prod. Cancellation": production stopped on 30 September 2024 (7SS52: 31 March 2024) and the device is a spare part. Only 7SJ66 was an "Active Product". For a new project choose SIPROTEC 5; for an existing installation ask Siemens or your distributor about stock and spares supply.

What is the successor of each SIPROTEC 4 family?

According to the successor field in SiePortal: 7UT613 to 7UT85/86/87, 7UM62 to 7UM85, 7SA522 to 7SA82, 7SA86 and 7SA87, 7SA61 to 7SA82, 7SD522 to the line differential devices 7SD8x and 7SL8x, 7VK61 to 7VK87, 6MD66 to the modular 6MD8, and the 7SS52 bay unit to 6MU85 and the SIPROTEC 5 modular devices. No successor is named for 7SJ66. These are family-level successors; the pages do not say that housing, wiring and I/O are interchangeable, so every project has to be checked.

Which protocols does SIPROTEC 4 have, and what about IEC 61850?

According to the 7SJ63 manual, the system-interface protocols are IEC 60870-5-103, PROFIBUS FMS and DP, Modbus and DNP3.0, and IEC 61850 is added with the EN100 Ethernet module. Which of them a device has follows from its order number; for example 7UT6131-2EB91-1AA0 has Modbus RS485 on port B.

Can SIPROTEC 4 and SIPROTEC 5 line relays share protection communication?

The Siemens profiles of the 7SA87 and 7SL87 (SIPROTEC 5) describe serial protection communication with SIPROTEC 5 and SIPROTEC 4 devices over optical fibre, two-wire connections and communication networks, and name the "Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices". This helps a staged migration of lines; check the details in the manuals of the two devices concerned.

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    Has a successor

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