Siemens Energy & Automation, Inc.
Bellefontaine, OH 43311 U.S.A.
Installing Sensitrip
TM
and SB Electronic Trip Units In Zone
Selective Interlocking or ACCESS
TM
Communications Systems
Summary
The following table summarizes the required Component Types per each trip unit in the system. One component
per trip unit unless otherwise noted:
Component Selection Guide ➀
When ordered with circuit breaker from the factory.
One MTA or MTZ per eight trip units when required.
Always required when multiple MTs are used. One additional cable per each additional MT.
Notes:
1. It is recommended that for long, single-ended runs (over 1000 ft.), that a 120 ohm, 1/4 watt terminating
resistor between the Data+ and Data- terminals of the furthest devices be added. Adding a terminator
resistor is not an absolute requirement, but using it will minimize reflected interference on the communication
bus.
2. Both loop and straight RS-485 topologies are acceptable. The advantage of the straight topology is further
distance to the last device (4000 ft.) The advantage to the loop topology is that the devices will continue to
communicate even with a break in the line. The disadvantage of the loop topology is the distance to the
furthest device is only 2000 ft.
3. A Siemens Isolated Multi-Drop Converter [Cat. No. 18-658-852-537] may be used as an optional device used
to convert four (4) RS-485 communications loops to one (1) RS-232 port for host PC communications.
4. Protocol converters are available from the Siemens ACCESS group to provide plug-and-play capability with
over 25 different PLC protocols (Siemens S7, Modbus, etc.), Profibus, DeviceNet, and LonWorks.
5. If multiple MTs are used for ZSI applications, the Com terminal from the first MTs SEABus Out port must
be connected to the Com terminal of the next MTs SEABus In port on each MT being used.
6. Installed ICCB SB breakers without communication capability may be field upgraded by Siemens Field
Service personnel only. MCCB breakers may be field upgraded by Siemens Field Service or the end user.
7. Refer to Installing the ACCESS
TM
System Installation Guide [Manual SG-6028-01] for proper system shield and
grounding connections schemes.
Trip Units and Application
Component
Type
ZSI (only)
with Sensitrip
MCCB’s
ACCESS
and/or ZSI
with Sensitrip
MCCB’s
ZSI (only)
with all
SB-EC
Trip Units
ACCESS
and/or ZSI
with SB-TL
Trip Units
ACCESS
with SB-EC
Trip Units
EP
EPSB
MTZ
MTA
EPC Cable
MTC Cable
MTCSB Cable
✔✔
✔✔
✔✔
✔✔
✔✔
✔✔
✔✔
Hazardous voltage.
Will cause death or serious
injury.
Turn off and lock out all power supplying
the circuit breaker prior to cover(s) removal
or while cover(s) are removed and when
installing any internal or external accessory.
Replace the cover(s) and shield(s) before
power supplying this device is turned on.
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