Siemens ETU776 - ETU755 Trip Unit Overview; ETU755 Ansicht and Design Details; ETU755 Safety Cautions

Features and benefits .......................................................... 2
Breaker assembly view ......................................................... 3
Draw-out cradle assembly view............................................. 4
Electronic trip units .......................................................5- 11
ETU Models and features ................................................. 6
ETU communication ........................................................ 7
ETU metering function ..................................................... 8
Alarm parameters ............................................................ 9
Extended relaying ............................................................ 9
Function overview of the ETU ...................................10 - 11
Breaker accessories and options ................................12 - 13
Ground fault module ......................................................12
Key lock-out ...................................................................12
Operation counter ..........................................................12
Auxiliary contacts ...........................................................12
Breaker status sensor (BSS) .............................................12
Bell alarm contact and reset coil ......................................13
Racking handle key lock ..................................................13
Breaker push-button lock-outs .........................................13
Close coil .......................................................................13
Spring charging handle lock ............................................14
Rating plugs ...................................................................14
Ready-to-close contact ....................................................14
Shunt trip ......................................................................14
Shunt trip (continuous duty) ...........................................14
Status contact ................................................................15
Spring charging motor ....................................................15
Undervoltage release ......................................................15
Cradle mounted options .............................................16 - 17
Secondary disconnect .....................................................16
Isolation shutters............................................................16
PROFIBUS or MODBUS communication .............................16
Dual key breaker locking .................................................16
Arc chute cover ..............................................................17
TOC (truck operated contacts) .........................................17
MOC (mechanism operated contacts) ..............................17
Accessories ................................................................18 - 22
Communication and metering power supply ....................18
Handheld test device ......................................................18
Breaker display adapter (BDA) .........................................18
Mechanical breaker interlocks .........................................18
Metering current transformer – 3-phase window ..............19
Metering current transformer – neutral phase ..................19
Neutral current sensor – 4-wire residual ..........................20
Breaker door cover .........................................................20
Neutral current sensor ....................................................20
Door sealing frame .........................................................20
Breaker lifting device ......................................................21
CubicleBus modules ........................................................21
Digital input module .......................................................21
ZSI module .....................................................................21
Analog output module ....................................................22
Pre-assembled CubicleBus communication cables .............22
Fixed-mounted breaker front bus connectors ...................22
Primary lug connector kits ..............................................22
UL 489 Ratings ...........................................................23 - 24
Ratings for UL 489 ..............................................................23
Ratings for UL 489 (non-automatic) .....................................24
UL 489 assembled breaker catalog number ................25 - 29
Interrupting rating, frame size, breaker type,
and frame rating ............................................................25
Rating plug ....................................................................26
Bell alarm, ready-to-close contacts ..................................27
Shunt trip ......................................................................27
Undervoltage release ......................................................28
Charging motor, motor switch, operations counter ...........28
Close coil, power metering and communications ..............29
Breaker locks ..................................................................29
Miscellaneous options ....................................................29
UL 489 assembled breaker catalog number
(non-automatic) .........................................................30 - 33
Breaker capacity, frame size, switch type
and frame rating ............................................................30
Ready-to-close auxiliary contacts .....................................30
Shunt trip ......................................................................31
Undervoltage release ......................................................31
Charging motor, motor switch, operation counter ............32
Close coil, communications .............................................32
Switch locks ...................................................................33
Miscellaneous options ....................................................33
UL 489 accessories .....................................................34 - 35
External breaker accessories ............................................34
Interrupting rating, frame size and frame rating ...............35
UL 489 cradle catalog numbers .........................................36
UL 489 cradle accessories ..................................................37
UL 1066 ratings ..........................................................38 - 39
Ratings for UL 1066 ............................................................38
Ratings for UL 1066 (non-automatic) ...................................39
UL 1066 assembled breaker catalog number ..............40 - 44
Interrupting rating, frame size, breaker type and
frame rating ...................................................................40
Rating plug ....................................................................41
Electronic trip units (ETU) ...............................................41
Bell alarm, auxiliary contacts ...........................................42
Shunt trip ......................................................................42
Undervoltage release ......................................................43
Charging motor, motor switch, operations counter ...........43
Close coil power metering and communications ...............44
Breaker locks ..................................................................44
Miscellaneous options ....................................................44
UL 1066 non-automatic assembled breaker
catalog numbers ........................................................45 - 48
Breaker capacity, frame size, switch type, frame rating .....45
Auxiliary contacts ...........................................................46
Shunt trip ......................................................................46
Undervoltage release ......................................................46
Charging motor, motor switch, operations counter ...........47
Close coil, communications .............................................47
Switch locks ...................................................................48
Miscellaneous options ....................................................48
UL 1066 breaker external accessories ...............................48
UL 1066 cradle catalog numbers .......................................49
UL 1066 accessories ..........................................................50
General wiring schematic ..........................................51 - 52
Ground fault setting ..........................................................53
Metering voltage details ...................................................54
Fixed breaker dimensions ..........................................55 - 66
Frame size 1 ............................................................55 - 60
Frame size 2 ...................................................................61
Frame size 3 ............................................................62 - 66
Draw-out breaker dimensions ....................................67 - 78
Frame size 1 ............................................................67 - 71
Frame size 2 ............................................................72 - 75
Frame size 3 ............................................................76 - 78
Low Voltage Circuit Breaker
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