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External Accessories

Siemens ACCESS Communications System

SB Breaker Communication

All SB Circuit Breaker trip units feature two levels of communi-

cation: Zone Selective Interlocking and ACCESS System open-

protocol communications. The SB-EC Trip Unit is fully equipped

for direct integration into ACCESS or compatible communica-

tion systems. It does not require a MTA (Muliplexer/Translator

for ACCESS communications and Zone Interlocking) or expan-

sion plug (EP).

If zone selective interlocking alone is speciﬁed for a SB-EC or

TL Trip Unit, a MTZ (Muliplexer/Translator for Zone Interlock-

ing) and an EP are required.

If zone selective interlocking and full ACCESS communications

are speciﬁed for a TL Trip Unit, a MTA and an EP are required.

The MT (as in MTA and MTZ) is a minicomputer that collect

data from and transmit data to difference components

integrated into the ACCESS communications system. The MT

can support up to eight ﬁeld devices. Multiple MTs can be

connected, although an expansion plug may be required for

each trip unit.

Siemens WinPM supervisory software (version 4.0 or later)

delivers a powerful energy management system providing

sophisticated monitoring capability to a host computer and

other components in the electrical distribution system at

affordable cost. It also provides process control, including peak

demand, trend analysis, waveform analysis, and harmonic

calculations and displays. These functions help pinpoint energy

consumption, power quality issues, and the energy cost of any

process. Outages and potential outages can be quickly

diagnosed and plans can be generated for expansion and

preventative plant maintenance.

NOTE: Refer to Bulletin IPIM-2211 for additional informa-

tion on the MTA and Siemens WinPM software.

Communications is accomplished via EIA-485 twisted pair

wire or modem. It provides communications to a remote site

and allows access to multiple plants. WinPM uses a Microsoft

Windows dynamic data exchange (DDE) server that allows

data exchange to other Windows-based software such as

spreadsheets and word processors.

Protocol Converters are available from the Siemens ACCESS

group for connecting a variety of open and proprietary automa-

tion protocols, including Proﬁbus DP, LonWorks, Siemens S7

PLC, and many other third-party PLCs and associated net-

works. The SB-EC Trip Unit’s EIA-2342 communications port

provides additional PC communications for available trip unit

data displays and trip unit conﬁguration via Siemens SBWIN

software. Remote open/close operation is also possible if a

remote open/close relay is installed.

Expansion Plug



Factory wired when ACESS communications or ZSI is ordered for

the SB breaker from the factory.

The EP is an electronic interface and isolation module required

to integrate a breaker into an ACCESS system. When required,

one expansion plug is used for each circuit breaker in the

system and is used to interface trip units to a MTZ or MTA.

The expansion plug is always necessary for zone interlocking

or full ACCESS communications for the TL Trip Unit. It is not

required for ACCESS communications with the SB-EC Trip

Unit. However, an expansion plug is required for zone inter-

locking with the SB-EC Trip Unit.

Expansion Plug Dimension Drawing

SB Systems Breakers

The following sections describe both types of SB trip units,

the standard Type ‘TL’ unit with rotary switches, and the SB

Energy-Comm (SB-EC) Trip Unit with keypad and display. Since

the SB-EC Trip Unit has integral communications capability, the

MTA device is not

required to connect within an ACCESS sys-

tem, however for SB-EC Trip Units in a ZSI system, an MTZ or

MTA is required.

The type EPSB expansion plug is factory wired to the SB

breaker trip unit’s rear connector and also located near and

wired to the SB breaker’s secondary terminal block for ﬁxed

mount breakers or sliding disconnects for drawout breakers.

These connections are factory wired when the SB breaker is

ordered with the standard switch based type ‘TL’ trip unit for

ACCESS communications or for any trip unit with ZSI capability.

Installed ICCB SB breakers without communication capability

may be ﬁeld upgraded for communication capability by

Siemens Field Service personnel only

Breaker Type Frame Size Mounting Type Cat. No.

SB ICCB 1200A, 2000A Fixed EPSBFMK



Drawout EPSBDMK



SB ICCB 3200A, 5000A Fixed EPSB4FMK



Drawout EPSB4DMK



Sensitrip

MCCB

ALL ALL

EPSB

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