siemens
Siemens 3NX8 NH Fuse Switch Disconnector
Model: 3NX8012
4-hour response · Pricing in SAR · Delivery across all KSA regions
3NX8012 — Siemens 3NX8 NH Fuse Switch Disconnector
The Siemens 3NX8 is a compact NH fuse combination switch-disconnector integrating a rotary isolating switch with NH fuse holders in a single DIN-rail or base-plate mountable unit, providing coordinated short-circuit protection and visible isolation in feeder circuits rated 100 A to 1250 A at 690 V AC. The combined device eliminates separate fuse holders plus a disconnecting switch, reducing panel footprint, wiring, and BOM for industrial feeder protection applications where NH fuses are the preferred protection element.
The 3NX8 accommodates NH fuse sizes 00 through 3, covering 100 A to 1250 A, and the vertical fuse extraction mechanism allows NH link replacement with a DIN VDE 0660-certified tool under live panel conditions — an important consideration for Saudi process plants that cannot afford distribution board de-energisation for routine fuse replacement. The padlockable rotary handle satisfies LOTO isolation procedures, and an optional auxiliary contact module reports switch position to control systems.
In Saudi Arabia, the 3NX8 KSA is the standard industrial feeder protection device in main distribution boards, transformer LV panels, and industrial MCC incomers where high breaking capacity up to 120 kA with NH gG or aM fuse links is required. Panel builders across Riyadh, Jeddah, and the Eastern Province specify the 3NX8 for its high fault current performance and the ability to independently specify fuse link characteristics without changing switch hardware.
Razz Middle East stocks 3NX8 fuse switches in all NH sizes with a comprehensive range of gG and aM fuse links, busbars, and accessories for immediate delivery to panel builders.
Technical Specifications
Full specifications for the 3NX8012
- Current Range
- 100–1250 A
- Voltage
- 690 V AC
- NH Sizes
- 00, 0, 1, 2, 3
- Breaking Capacity
- Up to 120 kA (with NH fuse)
- Handle
- Rotary, padlockable in OFF
- Fuse Extraction
- Vertical, tool-operated
- Aux Contact
- Optional 1 NO + 1 NC
- Mounting
- DIN rail or base-plate
- Compliance
- IEC 60947-3, IEC 60269-2
Key Features & Benefits
- Combined NH fuse holder and isolating switch in a single type-tested device reduces panel footprint compared to separate fuse holders plus a disconnecting switch in industrial distribution boards.
- Vertical NH fuse extraction under live conditions using a certified insulated fuse puller eliminates the need to de-energise the distribution board for routine fuse replacement at continuously operating process plants.
- NH fuse link independence from switch body allows protection characteristics (gG, gM, aM) and current rating to be changed by replacing only the fuse link, optimising coordination without replacing switch hardware.
- Breaking capacity up to 120 kA with NH gG fuses provides the highest LV fault current interruption capability, meeting prospective fault levels at large transformer LV terminals and generator-backed substations.
- Padlockable rotary handle in OFF satisfies LOTO isolation requirements for individual feeder circuits at Saudi industrial distribution boards.
- NH size range 00–3 in a common product family covers all industrial feeder current ratings from 100 A motor feeders to 1250 A main distribution incomers from a single procurement source.
- Optional auxiliary contact provides remote confirmation of isolation status for unmanned distribution boards at remote Saudi pumping and utility facilities.
Industrial Applications in Saudi Arabia
- Industrial feeder protection in main distribution boards at SABIC petrochemical sub-distribution panels, where 3NX8 high breaking capacity protects circuits from transformer-backed fault currents exceeding 50 kA.
- Transformer LV terminal protection at industrial substations serving MARAFIQ utility customers, where NH aM motor fuse links provide back-up protection for the LV circuit breaker.
- MCC incoming feeder protection at large motor control centres at Aramco and SABIC process plants, combining incomer isolation and short-circuit protection.
- Distribution board incomer protection at commercial and government buildings, where 400–800 A NH size 1 and 2 fuse switches protect the main circuit from upstream fault currents.
- Generator output cable protection at hospitals, data centres, and critical infrastructure diesel generators, where NH gG fuse links protect output cables before the generator excitation responds.
- Welding transformer and arc furnace feeder protection at steel fabrication facilities, where NH aM motor-duty fuse links handle high inrush currents without nuisance operation.
- Water utility sub-distribution feeder protection at NWC remote facilities, where combined fuse-switch function reduces maintenance exposure to live circuits during routine fuse inspection.
Industrial Supplier in Saudi Arabia
Get a Quote for the Siemens 3NX8 NH Fuse Switch Disconnector
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Frequently Asked Questions — 3NX8012
Common questions from buyers in Saudi Arabia and the GCC
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