Key Features

Benefits

• Bottom-fitting design supports compact panel and distribution-board installation.
• Triple-pole operation switches all three phases together.
• Integrated padlocking and sealing support controlled isolation.
• Large windows and test holes assist inspection and electrical testing.

Technical Summary

Mersen MULTIBLOC 000.ST9, catalog 1.005.070, item D1070423. Three poles, size 000, 125A conventional free-air thermal current with NH fuse-links, 160A with solid links, 690VAC rated operational voltage and 250VDC rating. At 690VAC the AC21B operational current is 80A. Rated insulation voltage Ui is 1000V, impulse withstand voltage Uimp 6kV, frequency 50–60Hz, protection IP30, pollution degree 3 and rated duty uninterrupted. Short-circuit making capacity with solid links is 5.1kA peak; short-time withstand current is 3.5kA for 1 second. Conditional short-circuit current with fuse-links is 80kA at 500VAC/125A, 80kA at 690VAC/80A and 25kA at 250VDC/125A. Frame-clamp capacity is 2.5–50mm². Closed dimensions are 216 × 53 × 79.5mm; the open-door envelope is 227mm. Product weight is 0.43kg. Standard IEC/EN 60947-3; compatible NH fuse-links to IEC/EN 60269-2 and VDE 0636-2.

Installation Notes

Install by bottom fitting or panel mounting. The closed body is 216mm high, 53mm wide and 79.5mm deep; allow up to 227mm depth for the open switch door. A DIN-rail adapter is available separately for 35 × 7.5mm and 35 × 15mm rails to DIN EN 60715. Use compatible size 000 NH fuse-links and 2.5–50mm² conductors in the six supplied frame clamps.

Efficiency

Maximum permitted fuse-link power dissipation is 9W. Device power dissipation without NH fuse-links is 8W at 100A load and 13W at 125A load; maximum solid-link power dissipation is 1.2W.