Bussmann 500NHG3B Dual Indicator NH Size 3 Fuse Holder | Replacement, Equivalent & Selection Guide
The Bussmann 500NHG3B is a dual indicator NH Size 3 fuse holder designed for high-current industrial power distribution systems. Rated at 500 A, it provides reliable overcurrent protection with a built-in dual blown-fuse indicator for fast fault detection. This page covers technical specifications, compatible replacements, equivalent models, and a structured selection guide to help engineers and procurement teams make the right choice.
Technical Specifications
- Part Number: 500NHG3B
- Manufacturer: Bussmann / Eaton
- Series: NH / DIN Fuse Holder Series
- Type: Dual Indicator NH Size 3 Fuse Holder
- Rated Current: 500 A
- Fuse Size: NH Size 3 (NH3 / gG / gL)
- Indicator: Dual blown-fuse indicator (visual)
- Mounting: DIN rail / panel mount
- Poles: 1-pole (single-phase per unit)
- Voltage Rating: Up to 690 V AC
- Protection Degree: IP20 (finger-safe terminals)
- Standards: IEC 60269, EN 60269
- Weight: approx. 360 g
- Country of Origin: EU / Global
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or directly interchangeable with the Bussmann 500NHG3B. Always verify voltage, current rating, and mounting dimensions before substitution.
- Siemens 3NW7 Series – NH3 fuse holders with indicator, 500 A, 690 V AC
- Schneider Electric DF103A – NH Size 3 fuse switch disconnector, compatible mounting
- ABB OS400GJ12 – NH3 fuse switch, 400–630 A range, panel/DIN mount
- Legrand 021 43 – NH3 fuse carrier with indicator, IEC 60269 compliant
- Socomec FUSERBLOC NH3 – modular NH3 fuse holder with blown-fuse indicator
- Eaton Moeller SITOR NH3 – same Eaton/Bussmann product family, regional variant
Note: Konmask.com supplies original Bussmann 500NHG3B units. Replacement recommendations are for reference only. Contact us to confirm cross-compatibility for your application.
Why Choose the Original Bussmann 500NHG3B
- Genuine Bussmann / Eaton quality – manufactured to IEC 60269 standards with full traceability
- Dual indicator – simultaneous visual fault detection on both phases reduces downtime
- Finger-safe IP20 design – compliant with modern electrical safety regulations
- High interrupt capacity – suitable for demanding industrial power distribution panels
- Long service life – robust construction for continuous 500 A operation
- Global certifications – CE, IEC, EN compliant for international projects
Typical Applications
- Main distribution boards (MDB) and sub-distribution panels
- Industrial motor control centers (MCC)
- Power factor correction (PFC) capacitor bank protection
- Transformer secondary protection (up to 500 A)
- Renewable energy inverter output protection
- Heavy-duty machine tool and press line power distribution
- Data center and UPS system feeder protection
System Compatibility
The 500NHG3B accepts standard NH Size 3 (NH3) fuse links conforming to IEC 60269-1/2, including:
- gG (general purpose) NH3 fuse links: 315 A – 500 A
- gL (cable protection) NH3 fuse links
- aM (motor protection) NH3 fuse links
- Compatible with Bussmann LPJ, KRP-C, and NH3 series fuse links
- DIN rail systems: 35 mm top-hat rail (EN 60715)
- Busbar systems: 60 mm pitch copper busbar
Selection Guide
Use the following criteria to confirm the 500NHG3B is the right choice, or to identify the correct alternative:
- Step 1 – Current rating: Confirm load current ≤ 500 A. For loads 315–500 A, NH3 is the correct size.
- Step 2 – Voltage: System voltage ≤ 690 V AC? The 500NHG3B is rated accordingly.
- Step 3 – Fuse type: Identify required fuse characteristic (gG, gL, aM) based on load type.
- Step 4 – Indicator requirement: Dual indicator needed? 500NHG3B provides dual visual indication. Single indicator → consider 500NHG3 (without B suffix).
- Step 5 – Mounting: DIN rail or busbar? Confirm panel cutout and busbar pitch (60 mm standard).
- Step 6 – Certifications: IEC / CE required? 500NHG3B is fully compliant.
Still unsure? Contact our technical team with your single-line diagram or panel schedule for a free selection review.
Quality Assurance & Sourcing
- Authorized distribution: Konmask.com sources Bussmann products through verified supply channels
- Anti-counterfeit: All units include original Bussmann / Eaton packaging and batch traceability
- Inspection: Visual and dimensional inspection before shipment
- Documentation: Certificate of conformity and datasheet available on request
- Warranty: 12-month warranty against manufacturing defects
How to Order
- Part Number: 500NHG3B
- Minimum Order Quantity: 1 piece
- Lead Time: In-stock items ship within 1–3 business days; contact us for bulk order lead times
- Payment: T/T, PayPal, credit card, and trade terms available for qualified buyers
- Shipping: Worldwide DHL / FedEx / UPS express; sea freight for large orders
- RFQ: Email support@konmask.com or call +0086 19859288691 for volume pricing
Replacement & Compatibility FAQ
Q: What is the difference between 500NHG3 and 500NHG3B?
A: The “B” suffix denotes the dual blown-fuse indicator version. 500NHG3 has no indicator; 500NHG3B has dual visual indicators for faster fault identification.
Q: Can I use a Siemens 3NW7 as a direct replacement?
A: The Siemens 3NW7 series is functionally equivalent for NH3 500 A applications, but mounting dimensions and busbar pitch may differ. Always verify before installation.
Q: Is the 500NHG3B compatible with NH3 gG 400 A fuse links?
A: Yes. The holder accepts any NH Size 3 fuse link from 315 A to 500 A rated for ≤ 690 V AC.
Q: Does Konmask.com supply the fuse links separately?
A: Yes. Contact us with your required current rating and fuse characteristic (gG/aM) for a matched fuse link quote.
Q: What certifications does the 500NHG3B carry?
A: CE marking, IEC 60269-1, EN 60269-2. Full documentation available on request.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
