• Siemens SENTRON 5SD74 surge arresters type 1+2+3 for 40 mm busbar
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Siemens SENTRON 5SD74 surge arresters type 1+2+3 for 40 mm busbar

Siemens SENTRON 5SD74 surge arresters type 1+2+3 for 40 mm busbar

SENTRON 5SD74 type 1 + type 2 + type 3 surge arresters for direct mounting on 40 mm busbar systems, with remote signaling and optional phase tap.

Key features

  • Type 1 + 2 + 3 protection in one device
  • Adapter for 40 mm busbar systems, 47 mm width
  • Lightning impulse current 12.5 kA or 7.5 kA (10/350 us)
  • Remote signaling, versions with phase tap
  • For TN-C (3+0) and TN-S/TT (3+1) systems

Specifications

Brand Siemens SENTRON
Series 5SD74
SPD type Type 1 + type 2 + type 3
Rated voltage Un 240/415 V AC
Max. continuous voltage Uc 300 V AC
Width 47 mm
Remote signaling Yes
Source Siemens Catalog LV 10 · 2026, p. 514-515
5SD7443-8KK21 System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 12.5 kA | Phase tap: No
5SD7443-8KK22 System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 12.5 kA | Phase tap: Yes
5SD7443-8KK11 System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 7.5 kA | Phase tap: No
5SD7443-8KK12 System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 7.5 kA | Phase tap: Yes
5SD7444-8KK21 System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 12.5 kA | Phase tap: No
5SD7444-8KK22 System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 12.5 kA | Phase tap: Yes
5SD7444-8KK11 System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 7.5 kA | Phase tap: No
5SD7444-8KK12 System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 7.5 kA | Phase tap: Yes
Surge Protection DevicesSiemens
8 product codes available in this family
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Siemens SENTRON 5SD74 surge arresters type 1+2+3 for 40 mm busbar

Brand Siemens·Surge Protection Devices

Available part numbers (8)

5SD7443-8KK21, 5SD7443-8KK22, 5SD7443-8KK11, 5SD7443-8KK12, 5SD7444-8KK21, 5SD7444-8KK22, 5SD7444-8KK11, 5SD7444-8KK12

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Product codes & specifications
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Product codeSpec
5SD7443-8KK21System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 12.5 kA | Phase tap: No
5SD7443-8KK22System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 12.5 kA | Phase tap: Yes
5SD7443-8KK11System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 7.5 kA | Phase tap: No
5SD7443-8KK12System: TN-C | Protection paths: L-PEN | Circuit: 3 + 0 | Iimp (10/350 us): 7.5 kA | Phase tap: Yes
5SD7444-8KK21System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 12.5 kA | Phase tap: No
5SD7444-8KK22System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 12.5 kA | Phase tap: Yes
5SD7444-8KK11System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 7.5 kA | Phase tap: No
5SD7444-8KK12System: TN-S and TT | Protection paths: L-N, L-PE and N-PE | Circuit: 3 + 1 | Iimp (10/350 us): 7.5 kA | Phase tap: Yes

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