Application Scenarios
A large bulk material handling terminal operates a 690 V motor control center feeding dozens of conveyor drive motors through individual feeder branches. The failure mode that terrifies maintenance engineers here is single-phasing: one fuse on a three-phase branch operates, the contactor does not drop out, and the motor continues running on two phases while its windings overheat and burn. By the time anyone notices the smell, the motor is scrap and the conveyor is down for a full shift.
This is precisely where the ABB 63NHG00B-690 changes the equation. When a genuine fault causes the fuse element to operate, two indication mechanisms activate simultaneously: the top-mounted mechanical striker pin ejects, and the front-view color window shifts to a high-visibility fault indication. A technician walking the switchboard spots the operated fuse from the front of the cubicle regardless of how the fuse was installed. When paired with an auxiliary microswitch (such as the ABB 170H0235), the striker pin actuation can also send a remote “fuse blown” signal directly to the PLC or SCADA system, enabling the control system to drop the contactor within the same scan cycle before motor damage can begin .
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 63NHG00B-690 |
| Order Code | 3ABD0001782 |
| Manufacturer | ABB (Low Voltage Products, NH System) |
| Product Category | Low-Voltage NH Fuse Link (HRC Fuse Insert) |
| Construction Size | NH00 (DIN 43620) |
| Rated Current (In) | 63 A continuous |
| Rated Voltage (Ue) | 690 V AC; frequency 45–62 Hz |
| Breaking Capacity | 120 kA at 690 V (IEC 60269) |
| Utilisation Category | gG / gL — full-range overload and short-circuit protection |
| Status Indication | Dual combination: mechanical striker pin (top) + color-change window (front/side) |
| Contact Type | Silver-plated knife-blade contacts |
| Power Dissipation | Approximately 5.6 W at rated current |
| Weight | Approximately 216 g |
Technical Principles and Innovative Values
- Innovation Point 1: Dual-Path Blown-Fuse Indication. The 63NHG00B-690 integrates two independent indication mechanisms into a single fuse body. The top striker pin provides mechanical confirmation and can actuate an auxiliary microswitch for remote alarm signaling, while the front-view color window allows direct visual inspection from outside the cubicle. This dual approach solves the practical problem of identifying which phase has operated in dense multi-circuit panels where fuses may be installed in any orientation .
- Innovation Point 2: 120 kA Rupturing Capacity in NH00 Footprint. The 63NHG00B-690 achieves its high breaking capacity through a precisely calibrated silver element embedded in high-purity quartz sand within a ceramic body. Upon short-circuit, the sand rapidly absorbs and quenches the arc energy, confining the fault within the fuse body even at prospective fault currents up to 120 kA. This exceeds the typical prospective fault level of most industrial low-voltage networks, providing a safety margin against system upgrades or transformer changes .
- Innovation Point 3: gG/gL Full-Range Protection Characteristic. The 63NHG00B-690 carries the gG/gL utilisation category, meaning a single fuse element covers both cable protection (gL) and general equipment protection (gG). This eliminates the need for separate cable-only and equipment-only fuse pairs on feeder branches, simplifying selection and reducing spare parts inventory. The full-range characteristic withstands motor starting surges while still clearing genuine short-circuits in milliseconds .
