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Series 503SI Fused terminal blocks - 20mm x 5mm fuses

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Series 503SI fused terminal blocks are available in unearthed versions from 1 to 5 poles and earthed versions from 3 to 5 poles.

A common dovetail enables mixed assemblies to be constructed by clipping on additional 1 pole lengths to provide multiple versions of fused and unfused terminals.

All variations can be supplied with or without wire protectors.

Earth Screws & Washers (Optional)
Screws: 503SIES – M3 x 12, Posi
Washers: 503SITW – M3

Technical Details

Mouldings: nylon 6.6(PA6/6), grey, UL94 V2,
(fuseholder black)
Inserts: brass, tinned
Screws: M3 steel, zinc plated, chromed
Screw tightening torque: max: 0.5 Nm
Temp. limits: max short term: 160º C
continuous: 100º C
Current rating: to EN 60 127-6: fuseholders: 10A
to EN 60 598: terminal blocks: 16A
to EN 60 998: terminal blocks: 24A
Voltage rating: terminal blocks: 380v
fuseholders: 250v
Conductor size: without wire protectors: up to 6mm2
with wire protectors: up to 2.5mm2
Wire stripping length: 7mm2 – 7.5mm2
Fuse size: 20mm x 5mm
Fixing centres: peg to earth screw: 15mm
peg to fixing hole: 20mm
Glow wire options available for installations in accordance with
EN 60 335-1 upon request.


Marking: special printing available. Please provide sketch.

High temperature: details on request.



Series 503SI Fused terminal blocks - 20mm x 5mm fuses

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