Year: 2026

The Relion 615 Series is a comprehensive family of protection relays per

fectly aligned for the protection, control, measurement, and supervision of

utility substations and industrial systems. It includes dedicated protection

relays for feeder, motor, and transformer protection.

The PCMU provides a seamless and cost effective way to re

place legacy relays. It reduces risk and saves money. A detailed

comparison of the PCMU series vs the traditional replacement,

which requires an adapter plate and is not wire-alike, shows

how users save time and money when replacing protection

relays and requires less personnel for less time.

The PCMU replaces DPUs of the 245. 445. and 2000 series

and MSOC relays. To request a training or quotation, contact

your ABB representative with the style numbers of your existing relays.

The PCMU represents the best choice to replace ABB

legacy relays. It ensures a reliable, seamless upgrade due

to the risk reduction only a wire-alike solution can provide.

It also offers the lowest possible cost of installation in

the market by allowing you to use the existing wiring and

connecting it into the wire-alike terminals*. Additionally,

the time to update drawings after installation is virtually

eliminated since no changes in wiring are required.

PCMU benefits:

− Relion® REF615 technology – Provides the ideal solution

to upgrade ABB’s DPU245. DPU445. DPU2000 and MSOC relays

− Installation time savings

− Pre-designed wire-alike and pre-configured relay solution

to quickly and efficiently carry out the replacement (retrofit)

and minimize downtime

− Wire-alike solutions, plate that contains terminal blocks

with connection to REF615 relay pre-wired based on appli

cation requirements

− Installation can be completed in as little as 40 minutes

− Form & fit– PCMU utilizes the existing cutout; no panel

modifications, cutting, or drilling is necessary (except MSOC)

− Engineering time savings – Save up to 70% of the time

required to update existing drawings after the upgrade

− Eliminate risk of setting conversions – Settings conversion

support is included to ensure your system keeps functioning

properly as soon as the new units are powered on

− Expanded communication capabilities – With the Relion

615. you can use Modbus, DNP3.0. or IEC 61850 for your

communications

− Advanced technology – Upgrade to the latest capabilities in

protection, control, metering, and fault recording

− Reduced risk of human error – Controlled and repeatable

procedure for replacing existing protection relays with modern

protection relay allows users to implement as standardized solution.

Analog inputs

− Three phase currents: 5/1 A programmable

− Ground current: 5/1 A programmable or 0.2 A

− Rated frequency: 60/50 Hz programmable

− Three-phase and ground voltages: programmable nominal

secondary voltage

Binary inputs and outputs

− Two binary inputs standard

− Three to seven programmable outputs

− One self-check alarm output

Communication

− IEC 61850-8-1 with GOOSE messaging

− DNP3.0 Level 2+ over TCP/IP

− Modbus over TCP/IP

− Time synchronization via SNTP (primary and backup servers)

− Optional serial RS-485 port programmable for DNP3.0 Level

2+ or Modbus RTU

− Optional IRIG-B time synchronization

Control voltage

− Option 1: 48 … 250 V dc, 48 … 240 V ac

− Option 2: 24 … 60 V dc

Product dimensions and weights

− Product Dimensions: 6.46” (164 mm) x 6.97” (177 mm) H x

8.68” (221 mm) D

− Product Weight: 10 lb. (4.54 kg)

Tools

− PCM600 2.6 or higher for setting, configuration and data

retrieval

− Web browser based user interface (IE 7.0 or later)

Certificates

− UL Listed product, File E103204

The PCMU MSOC is installed by using modern cutting tools

for fast and clean retrofit. The tool enables a precise quality cut

each and every time.

Bus protection via GOOSE

The IEC 61850 implementation in PCMU MSOC includes

fast peer-to-peer communication, over the substation bus.

Use GOOSE communication between PCMU MSOC relays of

the incoming and outgoing feeders of a substation to form a

stable, reliable, and high-speed busbar protection system. The

cost-effective GOOSE-based busbar protection is obtained by

configuring the relays and the operational availability of the pro

tection is assured by continuous supervision of the protection

devices and their GOOSE messaging over the station bus. No

separate hard-wiring is needed for the horizontal communica

tion between the switchgear cubicles.

Pre-emptive condition monitoring

For continuous knowledge of the operational availability of the

PCMU MSOC features, a comprehensive set of monitoring

functions to supervise the relay health, the trip circuit, and the

circuit breaker health is included. The breaker monitoring can

include checking the wear and tear of the circuit breaker, the

spring charging time of the breaker operating mechanism and

the gas pressure of the breaker chambers. The relay also mo

nitors the breaker travel time and the number of circuit breaker

operations to provide basic information for scheduling breaker

maintenance.

Standardized communication

As a standard feature, PCMU MSOC supports the IEC 61850

standard for communication between devices within the subs

tations along with the industry standards DNP 3.0 and Modbus

protocols. The implementation of the IEC 61850 substation

communication standard in PCMU MSOC encompasses both

vertical and horizontal communication, including GOOSE mes

saging and parameter setting according to IEC 61850-8-1. The

substation configuration language enables the use of enginee

ring tools for automated configuration, commissioning, and

maintenance of substation devices.

Pre-emptive condition monitoring

For continuous knowledge of the operational availability of the

PCMU MSOC features, a comprehensive set of monitoring

functions to supervise the relay health, the trip circuit, and the

circuit breaker health is included. The breaker monitoring can

include checking the wear and tear of the circuit breaker, the

spring charging time of the breaker operating mechanism and

the gas pressure of the breaker chambers. The relay also mo

nitors the breaker travel time and the number of circuit breaker

operations to provide basic information for scheduling breaker

maintenance.

Protection and control

The PCMU MSOC is the most powerful, advanced and simplest

feeder protection relay in its class, offering time and instantane

ous overcurrent, negative sequence overcurrent, phase discon

tinuity, breaker failure, thermal overload, and voltage metering

and protection. The relay features optional high impedance fault

(HIZ) and sensitive earth fault (SEF) protection for grounded and

ungrounded distribution systems. The relay incorporates a flexi

ble three-phase multi-shot auto-reclose function for automatic

feeder restoration in temporary faults on overhead lines.

The PCMU MSOC integrates basic control functionality, which

facilitates the control of one circuit breaker via the relay’s front

panel human machine interface (HMI) or remote control system.

To protect the relay from unauthorized access and to maintain

the integrity of information, the relay has been provided with a

four-level, role-based user authentication system, with individual

passwords for the viewer, operator, engineer, and administrator

levels. The access control system applies to the front panel

HMI, embedded web browser based HMI, and the PCM600

relay setting and configuration tool.

The TU805K01 is a kit consisting of 10 pcs TU805. TU805 is a 16-

channel 50 V terminal unit for the S800 I/O modules DI801 and

DO801. The Terminal Unit is a passive unit for the distribution of

external process power.

Features and benefits

• Enables 2- and 3-wire connections of process signals.

• Direct mounting on the I/O module.

• Requires no extra space.