HINODE 660GHX125-125A Ultra-Fast Fuse Link

HINODE (Hinode Electric Manufacturing Co., Ltd., Japonia) Semiconductor Protection Ultra-Fast Fuse. 660GHX series, 125O, AC/DC 660V, bolt-mount type, widely used for short-circuit protection of power circuits in inverters, redresoare, convertoare, DC power supplies and energy storage systems.

Descrierea modelului

660: Rated voltage AC/DC 660V

GH: Series of cylindrical bolt-mounted high breaking capacity ultra-fast fuses

X: Product suffix for basic version, without microswitch for blown fuse alarm. The alarm version is suffixed with S, de ex. 660GH125S

125: Rated current 125A

Common shorthand in market: 660GHX125, full marking 660GHX125-125A

Specificații electrice de bază

Outline & Instalare

Structura: Flange with mounting holes at both ends, bolt-tight mounting, clip mounting is not allowed

Basic cylinder dimension: φ17mm, overall length increases with current rating

Montare: Matched fuse holder series HT6017

Aplicații tipice

Power circuit protection for variable frequency drives and servo drives

Short-circuit protection for rectifier bridges, IGBTs and thyristor power semiconductors

DC bus, battery test equipment, low-voltage energy storage converters

Metalurgie, tranzit feroviar, high-power UPS power supplies

Selecţie & Ghid de înlocuire

1. Distincţie: 660GHX125 (nicio alarma) vs 660GH125S (with blown fuse signal microswitch). Identical outline dimensions and interchangeable holders.
2. Înlocuire casnică: Select semiconductor ultra-fast fuses of same rating 660V 125A. Capacitate de rupere, mounting hole pitch and time-current characteristic must be verified. General gG/gL fuses cannot be substituted.
3. Înlocuire: Power cut and voltage verification mandatory. After fuse blowout, check for breakdown of power semiconductors; never fit a new fuse and energize directly.

Reference Models in Same Series

660GHX063, 660GHX080, 660GHX100, 660GHX125, 660GHX160, 660GHX200

Domestic Replacement List for HINODE 660GHX125 (660V 125A aR Ultra-Fast Fuse Link) + Mounting Dimension Comparison

Piesa originala: Hinode 660GHX125, cylindrical double-flange bolt-on aR semiconductor protection fuse, φ17mm body, overall length approx.98mm, flanged mounting lugs at both ends, no striker (select striker version for alarm type). AC/DC660V, capacitate de rupere 100kA, for IGBT/rectifier short-circuit protection.

Core precondition for replacement: Only aR class semiconductor ultra-fast fuses are acceptable. gG general fuses are strictly prohibited for direct substitution. Priority for fully compatible dimensions to fit original HT6017 holder directly; close dimensions require hole pitch verification.

Baseline Dimensions of Original 660GHX125

Domestic Replacement Model Comparison Table

Selecţie & Note de înlocuire

1. Time-Current Characteristic (TCC Curve): RGS4A/RGS4 have the closest pre-arcing time and current limiting characteristics to 660GHX125. For high-power IGBT circuit replacement, request TCC curves from manufacturer for comparison.
2. DC Application: Original fuse supports DC660V (L/R=10ms). RGS4A and RS94G support DC660V. Some domestic models have derated DC rating; DC bus application must confirm DC specifications.
3. Blown Fuse Alarm Function

Original 660GHX125: no microswitch → select RGS4A without striker

Original 660GH125S (with alarm) → select RGS4A with striker, paired with holder microswitch for blown fuse signal output

4. Breaking Capacity Derating Risk: Original Hinode AC breaking capacity 100kA; domestic RGS4 series is 80kA. For most inverters and DC power supplies, site prospective short-circuit current <80kA and acceptable. Re-evaluation required if prospective short-circuit current >80cel.
5. Installation Inspection: Even with fully matched dimensions, inspect HT6017 holder copper contact surface for oxidation before replacement; control tightening torque to avoid overheating and nuisance fuse blowout.

Not Recommended Replacements (Avoid Pitfalls)

RT18, RT28 series: gG general purpose protection, not aR semiconductor ultra-fast fuses. Slow short-circuit response will cause IGBT burnout, strictly prohibited for substitution.

RS0, RS3 standard square body fast fuses: square housing, fully different flange mounting structure, cannot fit into original holder.

Quick Selection Recommendation

Spare part direct replacement without holder modification: Priority MRO RGS4A-660V125A aR or Longrong RGS4-660/125 aR

DC bus / energy storage application requiring high safety certification: Sinofuse RS94G (verify cabinet mounting clearance)

Fuse Replacement Verification Procedure (Pre-Energization Check + Power-On Test, HINODE 660GHX125 → Domestic RGS4A/RGS4)

Aplicație: Fuse replacement for variable frequency drives, rectifier units and DC power circuits. Core objective: Prevent secondary power semiconductor damage from direct energization.

1. Power Isolation & Safety Pre-Work (Obligatoriu)
2. Disconnect upstream circuit breaker / contactor and implement Lockout/Tagout (INIMA). Fully discharge DC bus and capacitors; verify AC/DC voltage <5V with multimeter.
3. Remove blown fuse link and visual inspection:

Ceramic body crack, arc flash or blackening;

Copper terminals of HT6017 fuse holder: oxidare, burn mark or deformation;

Thread damage on holder bolts.

⚠️ Once fuse blows, do not merely replace fuse. Power semiconductors on downstream must be inspected.

2. Downstream Power Semiconductor Fault Screening (Critical after Fuse Blowout)
3. Punte redresoare / IGBT module test (multimeter diode mode)

Measure forward and reverse voltage drop of each terminal to confirm short-circuit breakdown.

Check snubber capacitors and DC bus capacitors for bulging, leakage and short circuit.

2. Inspect busbars and terminals for short circuit and cable insulation damage.

If IGBT / rectifier bridge breakdown is found: replace damaged power semiconductor first before installing new fuse. Short-circuited devices will blow new fuse instantly or cause explosion upon energization.

3. Pre-Installation Verification of New Fuse Link
4. Model check: aR semiconductor ultra-fast fuse, rated voltage ≥660V, rated current 125A. Confirm striker status (original 660GHX125 has no striker; avoid mistakenly fitting striker-equipped version).
5. Dimension verification: body φ17, overall length 98mm, hole center distance 76mm, flange hole φ6.5; confirm smooth fitting into HT6017 holder.
6. Inspecție vizuală: ceramic housing crack-free, metal terminals at both ends no dent or deformation.
7. Cuplul de strângere: Recommended bolt torque 8~10 N·m. Insufficient torque causes high contact resistance and overheating leading to nuisance blowing; excessive torque cracks ceramic body.
8. Cold Insulation Test (De-Energized)
9. Disconnect wiring on one side of fuse link, use megger:

Main circuit insulation test to earth (1000V megger, pass if ≥100MΩ);

Verify no short circuit between phases or DC positive/negative bus.

2. Recheck inter-phase / DC bus positive-negative for short circuit with multimeter.
3. Stepwise Power-On Verification (No Full Load Closing at Once)
4. No-load energization: Disconnect output side (motor / încărca). Apply low trial voltage first (variable transformer preferred), ramp up gradually to rated 660V.

Monitor fuse and holder for abnormal noise, smoke or overheating;

Measure voltage across fuse link; voltage drop shall be extremely low under normal no-load condition.

2. No-load operation for 10~30 minutes: Infrared temperature measurement on metal terminals at both ends of fuse link; temperature rise ≤70K is acceptable. Shut down immediately if temperature rises rapidly and inspect contact surface.
3. Stepwise load ramp-up: Load at 25%→50%→75%→100% in sequence, hold each step for 15~30 minutes, continuously monitor terminal temperature.
4. Înregistra: Circuit current and fuse terminal temperature for future baseline maintenance reference.
5. Abnormal Condition & Shutdown Criteria

Immediately cut off power if any of the following occurs:

1. Fuse blows the moment of closing;
2. Continuous rapid temperature rise at terminals;
3. Arc, burning smell or ceramic body discoloration;
4. Abnormally high circuit current.
5. Long-Term Inspection after Commissioning
6. Periodic infrared thermal inspection, focus on fuse flange terminals;
7. Annual power-off inspection for oxidation of holder contact surface and re-torque;
8. Retain TCC curves of original and replacement fuse for future failure analysis.

Supliment: Replacement Boundary Risk Statement

Domestic RGS4 series AC breaking capacity is 80kA vs original Hinode 100kA.

If site prospective short-circuit current >80cel, this domestic model is not applicable; re-evaluation or continue using imported fuse required.