MasterPactTM NT/NW IEC Circuit Breakers and Switch-Disconnectors – Maintenance Guide PDF
LVPED508016EN–03

Maintenance Practices

Maintenance Strategy

You can define the optimal maintenance strategy according to criticality of your application by combining four maintenance practices:

  • Corrective maintenance

  • Preventive maintenance

  • Enhanced preventive maintenance

  • Predictive maintenance (condition-based maintenance)

Corrective Maintenance

Corrective maintenance:

  • Is carried out after fault recognition.

  • Is intended to put an item into a state in which it can perform a required function.

Corrective maintenance is recommended only for non-critical applications that have minimal impact in business operations.

Preventive Maintenance

Preventive maintenance:

  • Is carried out in either of the following cases:

    • At predetermined frequency in accordance with established time intervals or number of units of use but without previous condition investigation.

      NOTE: The time intervals or number of units of use may be established from knowledge of the failure mechanisms of the item.

    • According to prescribed criteria.

  • Is intended to reduce the probability of failure or the degradation of the functioning of an item.

Preventive maintenance is recommended for user applications with low to high criticality.

Preventive maintenance includes three programs:

  • Maintenance program that can be performed by the end user:

    • Basic end-user maintenance program

    • Standard end-user maintenance program

  • Maintenance program that can be performed by Schneider Electric Services:

    • Manufacturer maintenance program

Each preventive maintenance program is conducted during a scheduled outage as per maintenance frequency or cycles of use in accordance with the recommendations defined in this guide.

Enhanced Preventive Maintenance

Enhanced preventive maintenance comprises the Manufacturer preventive maintenance program included in the following Schneider Electric offers:

  • The Complete Manufacturer Maintenance program is recommended for devices in a user application with moderate criticality. It includes ProDiag Trip Unit diagnostic.

  • The Advanced Manufacturer Maintenance program is recommended for devices in a user application with high criticality. It includes the following diagnostics:

    • ProDiag Trip Unit

    • ProDiag Breaker

    • ProDiag Clusters for drawout MasterPact NT/NW devices

Contact your Schneider Electric field service representative for more information.

Predictive Maintenance (Condition-Based Maintenance)

Predictive maintenance is condition-based maintenance carried out following a forecast derived from repeated analysis or known characteristics and evaluation of the significant parameters of the degradation of the item.

A Schneider Electric service bureau assesses data on behalf of the end user to validate and trigger maintenance work orders, and schedule ensuing on-site maintenance.

Contact your Schneider Electric field service representative for more information.

EcoStruxure Facility Expert

EcoStruxure™ Facility Expert optimizes operations and maintenance, helping to ensure business continuity, and provides insights to service providers or facility managers.

EcoStruxure Facility Expert is a real-time collaborative technology available on mobile devices and PCs that enables managers and maintenance personnel to be connected with facilities and equipment. Information exchange between users is simple and fast.

EcoStruxure Facility Expert helps maintenance personnel to diagnose issues remotely and manage maintenance efficiently by:

  • Providing relevant information on critical assets.

  • Sending immediate state of the equipment and detailed information for diagnostics.

Defining Your Maintenance Plan

Low voltage circuit breakers, for example MasterPact NT/NW circuit breakers, in a power distribution infrastructure play a critical role in helping to protect the equipment and activity against cable overloads, short-circuits, and insulation faults, helping to ensure safety, reliability, security, and sustainability.

If you are a plant manager, maintenance manager, facility manager, or safety manager, you are responsible for helping to ensure your power distribution infrastructure with MasterPact NT/NW devices works in optimum conditions throughout its life cycle.

To achieve the necessary level of protection you need to have a maintenance plan to maintain each MasterPact NT/NW device (system and parts) in a satisfactory operational state for its useful service life, and you must ensure that the plan is carried out.

This guide provides you with the insights necessary to build your own MasterPact NT/NW maintenance plan, tailored to your device operating conditions (determined by the level of external stress of your device), and the environmental conditions impacting the aging and performance of your MasterPact NT/NW device, and the criticality of the application.

Schneider Electric recommends that you build your MasterPact NT/NW maintenance plan according to:

Example of Maintenance Plan

The following example is a preventive maintenance plan for three MasterPact NT/NW devices operating under different conditions in the facility.

The maintenance plan is based on the following parameters:

  • Number and types of maintenance programs: apply the three preventive maintenance programs recommended by Schneider Electric:

    • Basic end-user maintenance program

    • Standard end-user maintenance program

    • Manufacturer maintenance program

  • Frequency for each maintenance program: determined according to the following:

    • Environmental and operating conditions

    • Criticality of the user application

Criteria

MasterPact NT/NW device no. 1

MasterPact NT/NW device no. 2

MasterPact NT/NW device no. 3

Temperature

30 °C (86 °F)

25 °C (77 °F)

30 °C (86 °F)

Percent load (I/In)

67%

48%

85%

Relative humidity

75%

85%

70%

Corrosivity

Urban zones, scattered industrial activity, and heavy traffic

Salt environment

No salt mist

No salt mist

No salt mist

Dust

Moderate level

High level

Low level

Vibration

None

None

None

Environmental and operating conditions

Normal

Severe

Severe

Criticality of the user application

Low

Moderate

High

Maintenance program frequency

Basic end-user maintenance program

Every year

Every year

Every year

Standard end-user maintenance program

Every 2 years

Every 2 years

Every 2 years

Manufacturer maintenance program

Every 5 years

Every 3 years

Every 2 years

Diagnostic services (ProDiag programs)

Contact your Schneider Electric field service representative to plan maintenance operations.

Based on the data above, the recommended maintenance plan for the three MasterPact NT/NW devices is as follows:

  • Maintenance plan for MasterPact NT/NW no. 1 device, operating in normal operating conditions and with user application with low criticality:

Maintenance plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

Year 11

Year 12

Basic end-user maintenance program

✔

–

✔

–

–

✔

–

✔

–

–

✔

–

Standard end-user maintenance program

–

✔

–

✔

–

–

✔

–

✔

–

–

✔

Manufacturer maintenance program

–

–

–

–

✔

–

–

–

–

✔

–

–

Diagnostic services (ProDiag programs)

Contact your Schneider Electric field service representative to plan maintenance operations.

  • Maintenance plan for MasterPact NT/NW no. 2 device, operating in severe operating conditions and with user application with moderate criticality:

Maintenance plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

Year 11

Year 12

Basic end-user maintenance program

✔

–

–

✔

–

–

✔

–

–

✔

–

–

Standard end-user maintenance program

–

✔

–

–

✔

–

–

✔

–

–

✔

–

Manufacturer maintenance program

–

–

✔

–

–

✔

–

–

✔

–

–

✔

Diagnostic services (ProDiag programs)

Contact your Schneider Electric field service representative to plan maintenance operations.

  • Maintenance plan for MasterPact NT/NW no. 3 device, operating in severe operating conditions and with user application with high criticality:

Maintenance plan

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

Year 11

Year 12

Basic end-user maintenance program

✔

–

✔

–

✔

–

✔

–

✔

–

✔

–

Standard end-user maintenance program

–

–

–

–

–

–

–

–

–

–

–

–

Manufacturer maintenance program

–

✔

–

✔

–

✔

–

✔

–

✔

–

✔

Diagnostic services (ProDiag programs)

Contact your Schneider Electric field service representative to plan maintenance operations.
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