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Approvals & Standards

  • IEC/EN 60 947-3
  • For NH-fuse links size 4a in accordance with IEC/EN 60 269-2, VDE 0636-2

Key features & benefits

The production programme of MULTIBLOC® series 4a.ST8 - 1600 A comprises NH fuse switch disconnectors for 1600A.
They are designed for bottom fitting/panel installation and are available in single pole and triple pole units.
MULTIBLOC® size 4a are designed for NH fuse-links in accordance with IEC/EN 60269-2, VDE 0636-2, size 4a.
MULTIBLOC® offers the user the possibility of fast and easy installation as well as a high degree of security during installation and maintenance.

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Product Specifications

Item Number


Catalogue No.


Item Description (ERP)

MB4a 1600A 3P 1.000.091  

Short Description

MULTIBLOC size 4a / 1600A, 3-pole 2 x M12 terminal screws C.T.100A class1  




50 ... 60   Hz

Rated voltage AC IEC

690   V

Ampere Rating

1600   A

Utilization Category

AC 21 B @ Ue = AC 400 V; Ie = 1600 A  


1-,3-pole switching  

ROHS Compliant


Short Circuit Current Rating (SCCR)

31,5kA@Ue = AC 400 V; Ie = 1600 A / 31,5kA@Ue = AC 500 V; Ie = 1600 A / 31,5kA@Ue = AC 690 V; Ie = 1600 A  

Fuse Size


Design Details

single pole switching  

Number of Poles


Degree of Pollution


Rated Duty

uninterrupted duty  

Rated Impulse Withstand Voltage

8   kV

Rated Insulation Voltage

800   V

Rated SC Withstand

50 kA / 1 s  

Conventional Free Air thermal Current With Fuse-Links Ith

1600   A

Conventional Free Air thermal Current - Solid Links

1800   A

Max Power dissipation of Fuse Links Pn

140   W

Max Power dissipation of Solid Links Pn

42   W

Power Dissipation by Ith without Fuse-Links

270   W

Power Dissipation by Ith without Solid Links

270   W

Rated short circuit making capacity with solid links Icm

100   kA

Installation Mounting

Bottom Fitting/panel  


Cable termination components : 2xM12 terminal screws  

Product Weight

30.203   lb

Product Width

14.88   in

Product Length

9.17   in

Product Height

12.99   in

Sell Pack Quantity

1   EACH

Sell Pack Weight

30.203   lb

Sell Pack Width

10.63   in

Sell Pack Length

15.75   in

Sell Pack Height

11.02   in