For outdated switchgear from "Concordia Sprecher", "Concordia Sprecher & Schuh", and "Sprecher Energie", we have developed a range of retrofit solutions. These upgrades are designed to refurbish, renew, and modernize older systems equipped with circuit breakers from the above-mentioned manufacturers.

At SZM, we work independently of the original manufacturer to find a tailored solution using modern circuit breakers—for example, from Siemens, ABB, or Schneider Electric—that fit precisely into the place of the old breaker. In essence, we replace the "heart" of the system.

The original switchgear remains intact, but with the retrofit, we extend its service life and bring it up to current technological standards. Thanks to modern circuit breakers, spare parts availability is once again ensured for the component that experiences the highest mechanical and electrical load.

SZM Retrofit Solutions for Legacy HP Series Low-Oil Circuit Breakers

For HP series breakers, we have developed and successfully implemented modernization solutions for various truck-mounted breaker types:

•     Sprecher & Schuh HPTWz 304f ⇒ Retrofit with Schneider Electric HVX-D (12 kV, 1250 A, 36 kA): more
•     Sprecher & Schuh HPTW 305g ⇒ Retrofit with Siemens 3AE1 (12 kV, 2000 A, 36.1 kA): more
•     Sprecher & Schuh HPTWz 306e ⇒ Retrofit with Siemens 3AH5 (24 kV, 1250 A, 25 kA): more
•     Sprecher & Schuh HPTWz 506e ⇒ Retrofit with Siemens 3AH5 (24 kV, 1250 A, 25 kA): more

SZM Retrofit Solutions for Legacy HV Series Vacuum Circuit Breakers

For older HV series devices (HVTW), we have developed and implemented the following retrofit solutions:

•     Sprecher & Schuh HVTW 306e ⇒ Retrofit with ABB VD4 (24 kV, 800 A, 16 kA): more
•     Sprecher & Schuh HVTW 306e ⇒ Retrofit with Siemens 3AE1 (24 kV, 1200 A, 31.5 kA): more
•     Sprecher & Schuh HVTW 307g ⇒ Retrofit with Siemens 3AH5 (36 kV, 1600 A, 25 kA): more
•     Sprecher & Schuh HVTW 404 ⇒ Retrofit with Siemens 3AE1 (12 kV, 800 A, 31.5 kA): more

All the above-mentioned modernization and upgrade solutions can, of course, be adapted to your specific needs—or entirely new solutions can be developed. Our in-house engineering department brings many years of experience to the table.

If you’d like to learn more, feel free to call or email us:

⇒ René Schäfer, Retrofit Expert
Tel: +49 6372 9919221 | Mobile: +49 176 80330234 | Email: rene.schaefer(at)szm-gmbh.de

⇒ Michael Straßburg, Head of Engineering (Design/Construction)
Tel: +49 30 297705-192 | Mobile: +49 173 4392433 | Email: michael.strassburg(at)szm-gmbh.de