ABB TMAX XT XT7 Installation instructions

—

INSTRUCTION HANDBOOK

1SDH002301A1001 - ECN000285442

TMAX XT XT7

Disassembly instructions

Disassembly instruction tmaX Xt Xt7

1. SCOPE

Scope of this document is to illustrate the step-by-step disassembly process of ABB SACE Tmax XT XT7

moulded case circuit breaker equipped with an electronic trip unit (type Ekip DIP LS/I).

Document is focused on Tmax XT XT7 3p IEC version, anyway it allows to cover other versions of Tmax

XT XT7 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.

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 

Support Mounted on the upper part of the circuit breaker 

Cables protection Mounted on the back part of the trip unit 

Rating plug case Mounted on the front of the trip unit 

Rating plug printed circuit board In the rating plug case 

Backplane Mounted on the back part of the trip unit 

Trip unit case On the trip unit 

Trip unit back cover On the trip unit 

Trip unit printed circuit board In the trip unit 

Left MID cover Mounted on the left part of the circuit breaker 

Left MID Mounted on the left part of the circuit breaker 

Left base Mounted on the left part of the circuit breaker 

Block lever Mounted on the left part of the circuit breaker 

Trip coil In the trip coil group 

Trip coil group Mounted on the left part of the circuit breaker 

Trip test support Mounted on the right part of the circuit breaker 

MID Mounted on the right part of the circuit breaker 

SY lever Mounted on the MID 

Wires cover Mounted on the left part of the circuit breaker 

Wiring Mounted on the left part of the circuit breaker 

Operating mechanism Mounted on the center of the circuit breaker 

Unlocking shaft appendices Mounted on the pin of the operating mechanism 

Lever extension Mounted on the front toggle 

Protections Mounted on the upper case assembly 

Fixed contacts protections Mounted on the fixed contacts 

Covers Below the sensors 

Sensors In the bottom part of the circuit breaker 

Insulation protections On the moving contacts assembly 

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 are

provided:

 

 

 

 

 

applicable)

 

5. SEPARATE TREATMENT

Table below lists parts requiring a separate treatment adding information about part location inside

circuit breakers and related quantity.

Disassembly instruction tmaX Xt Xt7

Tools

Allen key

Flat screwdriver

6.1 PHASE 1 – CAP KITS

By means of the cross screwdriver unscrew

the 2 screws fixing the terminal clamp to the

circuit breaker main structure.

By means of the flat screwdriver push the cap

kits in order to remove them from the circuit

breaker main structure.

By means of the allen key remove the screws

connected with the cap kits and after manually

remove the plates.

Manually remove the terminal clamp.

Actions to be performed

8mm

Cross screwdriver

INSTRUCTION HANDBOOK

 

 

 

(Metal)

 

 



containing brominated flame

retardants)

 

Disassembled parts

By means of the flat screwdriver remove the

nuts mounted on the cap kits.

Disassembly instruction tmaX Xt Xt7

6.2 PHASE 2 – CIRCUIT BREAKER FRONT COVER AND OPERATING

MECHANISM COVER

Manually push the trip unit transparent

protection as indicated by the arrow and

remove it.

By means of the cross screwdriver push the

trip test button.

Manually close the circuit breaker pushing the

toggle in the direction indicated by the arrow.

By means of the cross screwdriver unscrew the

2 screws located in the lower part of the circuit

breaker fixing the circuit breaker front cover to

the circuit breaker main structure.

Actions to be performed

Tools

Torx key

No. 8

Cross screwdriver

Pliers

INSTRUCTION HANDBOOK

Manually lift the circuit breaker front cover to

complete the removal.

By means of the tork key remove the 4 screws

fixing the 2 keylock caps to the circuit breaker

front cover.

By means of the pliers remove the trip test

button.

By means of the cross screwdriver, unscrew

the 2 screws located in the upper part of the

operating mechanism front cover fixing the

operating mechanism cover to the circuit

breaker main structure.

Manually remove the upper keylock cap.

Manually remove the lower keylock cap.

Disassembly instruction tmaX Xt Xt7

By means the cross screwdriver, unscrew the

2 screws located in the bottom part of the

operating mechanism front cover fixing the

operating mechanism cover to the circuit

breaker main structure.

Manually lift the operating mechanism cover.

 

protection (Plastic)

 

 

(Plastic)

 

 

 

(Plastic)

Disassembled parts

INSTRUCTION HANDBOOK

6.3 PHASE 3 – TRIP UNIT

Actions to be performed

Tools

Cross screwdriver

Torx key

No. 20

No. 8

Flat screwdriver

Cutter

Pliers

By means of a cross screwdriver unscrew the 2

screws fixing the support to the circuit breaker

main structure.

By means of the cross screwdriver unscrew

the 2 screws located in the bottom part of the

trip unit and fixing the trip unit to the circuit

breaker main structure.

Manually remove the support.

By means of the torx key (size 20) unscrew the

2 screws located over the trip unit fixing the

trip unit to the circuit breaker main structure.

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