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Power Block

SB250 (561159)

nVent ERIFLEX Power Blocks are the main DIN mounted output/input devices for connection between primary and secondary switchboard, or main input/output connection for machine or industrial equipment (such as invertor, air conditioning machines, etc.). The high short circuit rated large cross section blocks offer time savings and reliability in every panel configuration. The complete Power Blocks range offers multiple connection types with up to four cables, nVent ERIFLEX Flexibar Advanced, or IBS/IBSB Advanced power braids.


  • Can be connected with round cross section cable or flat connection system like nVent ERIFLEX Flexibar or IBSB/IBSBR Power Braid
  • Compact power block with high short circuit current rating
  • Tinned copper or aluminum block allows for copper or aluminum conductor connections
  • Screw retaining cover is hinged and removable
  • Design allows for visual inspection of conductor and confirmation of connection
  • Modular snap-together blocks for building multi-pole power blocks
  • Easily clips onto DIN rail or mounts to panel with screws
  • Voltage detection and measurement connection
  • 95% fill ratio
  • Halogen free
  • RoHS compliant


Part Number SB250
Article Number 561159
Finish Tinned
Type Cable-Cable
Typical Application Current Rating, UL 255 A
Material Copper
Line Side Max Conductor Size, UL 250 kcmil
Load Side Max Conductor Size, UL 250 kcmil
Max Current Rating, IEC 400 A
Max Current Rating, UL 255 A
Peak Short Circuit Current (Ipk) 42 kA
Short Circuit Current Rating (SCCR) 100 kA
Max Working Voltage, IEC (Ui) 1,000 VAC
1,500 VDC
Max Working Voltage, UL (Vin) 1,250 VAC/DC
Line Side Number of Connections 1
Line Side Compact Stranded Wire Size 35 - 120 mm²
#6 - 250 kcmil
Load Side Compact Stranded Wire Size 35 - 120 mm²
#6 - 250 kcmil
Load Side Number of Connections 1
Load Side Stranded Wire Size - Ferrule 35 - 120 mm²
Depth (D) 2.28"
Height (H) 4.37"
Width (W) 1.24"
Unit Weight 0.66 lb
Certification Details UL® 1059
Complies With IEC® 60947-7-1
Enclosure Rating IP 20
Flammability Rating UL® 94V-0
Certifications CE, ERIFLEX SB
EAC 0234267 (Russian Federation)
Standard Packaging Quantity 1 pc
UPC 78285680391
EAN-13 8711893137279
SBF250 is UL® 1953 Listed when used with SB250SPCR. Max Working Voltage for UL 1953 applications is 1250 VAC/DC.

nVent, nVent CADDY, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without prior notice.

IEC is a registered trademark of the International Electrotechnical Commission.
UL, UR, cUL, cUR, cULus and cURus are registered certification marks of UL LLC.




Wind Power Solutions
1.94 MB English



EN 60947-7-1, 201 KB English
UR XCFR2.E198301
ANSI/UL 1059


Engineering Specifications

Instruction Sheets