ABB Tmax XT XT3 Installation instructions

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INSTRUCTION HANDBOOK
1SDH002294A1001 - ECN000285442
Tmax XT XT3
Disassembly instructions

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Disassembly instruction tmaX Xt Xt3
1. SCOPE
Scope of this document is to illustrate the step-by-step disassembly process of ABB SACE Tmax XT XT3
moulded case circuit breaker.
Document is focused on Tmax XT XT3 3p IEC version, anyway it allows to cover other versions of Tmax
XT XT3 circuit breaker with just few slight differences to be taken into account.
Gloves Glasses Safety shoes Protective clothes
4. TOOLS
Disassembly operations require the use of tools (e.g. screwdriver, torx key, pliers, …); tools to be used
are specified inside each phase of the disassembly process (see Chapter 6).
3. PERSONAL PROTECTIVE EQUIMENT (PPE)
When performing disassembly, following safety Personal Protective Equipment (PPE) must be worn:
2. SAFETY NOTES
Before proceeding with any disassembly operation, it’s mandatory to put the circuit breaker in open
position.
Disassembly operations of circuit breakers must be performed by qualified and skilled personnel in
the electrical field (IEV 195-04-01: person with relevant education and experience to enable him or her
to perceive risks and to avoid hazards which electricity can create) and having a detailed knowledge of
circuit breakers.
Disassembly activites must be performed in an ergonomic workspace able to ensure protection of per-
sons demanded to perform disassembly activities.
Applicable national legislation and international standards in force at the time of disassembly of circuit
breakers must be taken into account in addition to prescriptions illustrated in this document.
ABB declines any responsibility for injury to people or damage to property resulting from a failure to
comply with the instructions set out in this document and with any applicable safety standard.

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INSTRUCTION HANDBOOK
If disassembled parts require a separate treatment a specific indication is provided inside each phase
with reason why for the separate treatment (see Chapter 6).
Description Position inside circuit breaker Quantity
Cap kits In correspondence of circuit breaker connection terminals 
Trip unit cover Mounted in the lower part of the circuit breaker 
Trimmer Mounted on the circuit breaker cover 
Sides of the operating mechanism Parts constituting the operating mechanism 
Tripping shaft Between the operating mechanism and the tripping groups 
Rear cover Mounted on the back side of the circuit breaker case 
6. DISASSEMBLY PROCESS
Circuit breakers disassembly process is constituted by a sequence of operations to be performed on
products after their dismounting from original installation. For each phase following information is
provided:
 
 
 
 
 
applicable)
 
5. SEPARATE TREATMENT
Table below lists parts requiring a separate treatment adding information about part location inside
circuit breakers and related quantity.

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Disassembly instruction tmaX Xt Xt3
Tools
6mm
Allen key
Flat screwdriver
 
 
(Thermoplastics containing brominated flame retardants)
6.1 PHASE 1 – CAP KITS
1
By means of the allen key remove the screws
connected with the cap kits.
2
Insert the flat screwdriver as shown in the
picture 2 and push it up in order to remove the
cap kits.
Actions to be performed
Disassembled parts

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INSTRUCTION HANDBOOK
Tools
Cross screwdriver
6.2 PHASE 2 – FRONTAL
3
By means of the cross screwdriver unscrew
the 2 screws fixing the frontal to the circuit
breaker main structure.
4
Manually remove the frontal together with the
2 fixing screws.
Actions to be performed
Disassembled parts
 
 

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Disassembly instruction tmaX Xt Xt3
7
Tools
Pliers
6.3 PHASE 3 – TOGGLE
Actions to be performed
5
As preliminary action close the circuit breaker and
push the trip test button.
7
By means of the pliers take the upper part of the
toggle and remove it.
6
Slightly push the toggle towards the bottom part
of the circuit breaker.
Disassembled parts
 

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INSTRUCTION HANDBOOK
Disassembled part
6.4 PHASE 4 – OPERATING MECHANISM, TRIPPING SHAFT AND TRIP
UNIT COVER
8
As preliminary action by means of the flat
screwdriver push up the 2 pins located in
correspondence of the operating mechanism
and after remove the 2 pins.
10
By means of the torx key unscrew the 4 screws
fixing the operating mechanism to the circuit
breaker main structure.
11
Manually remove the operating mechanism
together with the tripping shaft.
9
By means of the cross screwdriver unscrew the
2 screws fixing the trip unit cover to the circuit
breaker main structure and remove the trip unit
cover.
Actions to be performed
Tools
Cross screwdriver
Flat screwdriver
Torx key
No. 10

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Disassembly instruction tmaX Xt Xt3
12
Manually remove the tripping shaft from the
operating mechanism.
13
Manually remove the trip test button located on
the trip unit cover and the spring behind it.
Disassembled parts
 
 
 

flame retardants)
 

flame retardants)
 
(Thermoplastics containing brominated flame
retardants)
 
 

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INSTRUCTION HANDBOOK
6.5 PHASE 5 – REMOVAL OF THE CIRCUIT BREAKER COVER
Tools Actions to be performed
Cross screwdriver
Cutter
14
By means of the cross screwdriver unscrew the
4 screws located in the upper part of the circuit
breaker fixing the circuit breaker cover to the
circuit breaker base.
16
Manually lift the circuit breaker cover.
15
By means of the cutter start removing the label
located on the left side of the circuit breaker and
manually complete the operation
Disassembled parts
 
 
 
Disassembled parts