Siemens Energy & Automation, Inc.
Bellefontaine, OH 43311 U.S.A.
Page 4 of 7
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.
SB System 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 commu-
nications capability, the MTA device is not required to connect within an ACCESS system, 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 units rear connector and also located near
and wired to the SB breakers 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.
The MTCSB cable is used to connect an MTA or MTZ to an EPSB expansion plug via the SB breaker secondary
terminal block or sliding disconnect.
A. SB Breaker Zone Selective Interlocking (only)
1. All SB Breaker Trip Units
Components Required:
• Siemens type MTZ - one per 8 trip units
• Siemens type EPSB expansion plug - one per trip unit, factory wired
• Siemens type MTCSB cable one per trip unit
Installation:
1. When the factory-installed ZSI option is present, the EPSB expansion plug is already wired to the breaker
and secondary control terminals. Connect an MTCSB cables spade lugs from the appropriate SB breakers
secondary terminals (LB9, 10, 11, & 12) to one of eight communication inputs on the MTZ.
2. If multiple MTs are used, 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.
3. Based on the sites coordination study, configure the expansion plugs DIP switches for Short Time and/or
Ground Fault ZSI per the EP Information and Instruction Sheet.
4. Configure the MTZ to identify the zones for each breaker, per the sites coordination study and information
and instruction sheet. Refer to figure 1 for system connections diagram.
B. SB Breaker ACCESS Communications (with or without Zone Interlocking)
1. Standard type TL switch-based trip unit
Components Required:
• Siemens type MTA - one per 8 trip units
• Siemens type EPSB expansion plug - one per trip unit, factory wired
• Siemens type MTCSB cable one per trip unit
Installing Sensitrip
TM
and SB Electronic Trip Units In Zone
Selective Interlocking or ACCESS
TM
Communications Systems
(20 strony)
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