MERZ - Combiner Box

MERZ  STRING BOX   -   MSB-244-16-1000-MDM-BC

Merz Combiner boxes are switchboards designed to connect and protect PV strings and arrays. These include a Merz DC load break disconnector, series MDC that ensures a safe and reliable operation. Optionally, it can be equipped with a surge protection devices, overcurrent protection like fuses, fast connectors type MC4 or similar and everything integrated in enclosures with a high protection degree, suitable for outdoor use.


  • 4 incoming / outgoing strings each / 2 MPPT`s
  • Maximum Voltage 1005 VDC
  • Incoming :  Max Current per String 16A / Max Strom per MPPT 32A (16A per String)
  • Outgoing : Max Current per String 16A (32A per MPPT) acc. IEC 60947
  • Cross section 4mm² up to 6mm²
  • Connection type MC4 Plug / Socket
  • SPD Typ 2 by EN 50539-11
  • Protection degree and impact resistance IP65; IK08 acc. IEC 60529
  • Enclosure Dimensions 12 DIN 218x308x118,8 mm



Enclosure closed

Enclosure cover opened

Interior view unwired

Enclosure base with DIN rail standard 35 mm


DC-Switch disconnector MDC10A

Surge Arresters

String Box Enclosure with MC4 Connectors

MC4 Connectors

Contact diagram



View - Front

View Site

View - Bottom

View - Interior


Your individual String Box - Tailored for your project.
We have the solution for you.

→ Please feel free to contact us.

+49 7971 / 252-252