Pemutus Tenaga (PMT) harus mampu menghubungkan maupun memutuskan arus beban dalam kondisi normal dan abnormal/ gangguan hubung singkat sehingga dilakukan kegiatan pemeliharaan untuk menjamin PMT layak dioperasikan. Metode pengumpulan data berupa observasi dan wawancara, serta menggunakan metode analisis deskriptif. Pengujian mencakup tiga pengukuran. Pertama pengukuran tahanan isolasi dengan hasil dalam kurun waktu 3 tahun, PMT mengalami penurunan kemampuan isolasi yang signifikan dengan nilai terendah 66 GΩ pada tahun 2022 namun masih memenuhi standar SK.DIR 0309 >1 MΩ/KV. Kedua pengukuran tahanan kontak dalam kurun waktu 3 tahun terlihat tidak mengalami perubahan kinerja yang besar, dengan hasil tahanan kontak terkecil pada tahun 2022 dengan nilai 49,5 µΩ masih memenuhi standar yang berlaku yaitu standar Alsthom ≤ 40 µΩ per titik sambung (< 10 ms. Pemutus Tenaga PMT 20 kV Penyulang Anoda Gardu Induk Serpong dinyatakan masih sesuai dengan standar dan masih layak beroperasi setelah kegiatan pemeliharaan.

The Circuit Breaker (CB) must be able to connect or disconnect load currents under normal and abnormal conditions/short circuit faults so that maintenance activities are carried out to ensure that the CB is advisable to operate. Methods of data collection in the form of observation and interviews, as well as using descriptive analysis method. The test includes three measurements. The first is insulation resistance with measurement results within a period of 3 years, CB experienced a significant decrease in insulating ability with the lowest value of 66 GΩ in 2022 but still meets the SK.DIR 0309 standard >1 MΩ/KV. Second is contact resistance within a period of 3 years did not appear to experience a large change in performance, with the result of the smallest contact resistance in 2022 with a value of 49.5 µΩ still meeting the applicable standards, namely the Alsthom standard 40 µΩ per connection point (<100 µΩ for number of connection points). The third is the measurement and calculation of the simultaneous Δt within 3 years of CB in the correlation of opening and closing there is no significant change with the smallest simultaneous result in 2022 with a value of 0.1 ms according to Alshtom's reference standard. Simultaneous Δt CB is < 10 ms. The 20 kV CB Circuit Breaker for the Serpong Substation Anode Feeder was declared to be still in accordance with the standard and was still feasible to operate after maintenance activities.