Overview
Overview
A resistor box is an electrical apparatus that provides precisely adjustable resistance values, typically built from high-stability resistance elements (wirewound or alloy) and offering stepped resistance adjustment via switches, knobs or plug-in connections. It delivers high accuracy, stability and thermal performance for any test or control system requiring strict resistance control. Resistor boxes are widely used in electrical / electronic laboratories, metrology and certification organizations, industrial automation and power-equipment testing — including circuit analysis and parameter verification in research and education; load simulation for power supplies, motors and inverters; commissioning and calibration in industrial control cabinets; testing and maintenance of new-energy systems (energy storage, solar PV, EV charging); calibration and verification of measurement instruments.
Key Features
High-Precision Adjustment
- Clear stepped resistance values with fine adjustment
- Meets precision-test requirements
Strong Stability
- Premium resistance materials with low temperature drift
- Stable over long-term use
High-Power Handling
- Supports high-power load applications
- Suitable for harsh industrial environments
Excellent Thermal Design
- Optimized structure and ventilation
- Reliable long-duration operation
Easy Operation
- Ergonomic knob / switch design
- Intuitive and efficient adjustment
Customization Support
- Flexible customization to customer requirements
- Different resistance ranges, power ratings and form factors
Applications
Typical Applications
Lab Teaching / Research
Load Simulation Test
Industrial Control Commissioning
New-Energy System Testing
Power Equipment Testing
Instrument Calibration
Compare Resistor Box / Cabinet Models
Side-by-side specs for every model in this family — power range, resistance range, tolerance, operating temperature and key applications.
| Specification | CustomLoad Box | CustomResistor Box | CustomResistor Box | CustomResistor Box | CustomResistor Cabinet |
|---|---|---|---|---|---|
| Product Name | three-phase adjustable Load Box / High-Power Test Cabinet (adjustable Load Box) | three-phase adjustable Load Box / High-Power Test Cabinet (adjustable Load Box) | three-phase adjustable Load Box / High-Power Test Cabinet (adjustable Load Box) | three-phase adjustable Load Box / High-Power Test Cabinet (adjustable Load Box) | three-phase adjustable Load Box / High-Power Test Cabinet (adjustable Load Box) |
| LoadClass Type | resistive load / discharge load / adjustable load (single or combined) | resistive load / discharge load / adjustable load (single or combined) | resistive load / discharge load / adjustable load (single or combined) | resistive load / discharge load / adjustable load (single or combined) | resistive load / discharge load / adjustable load (single or combined) |
| Power Mode | three-phase adjustable · AC/DC dual input available | three-phase adjustable · AC/DC dual input available | three-phase adjustable · AC/DC dual input available | three-phase adjustable · AC/DC dual input available | three-phase adjustable · AC/DC dual input available |
| Power Range | 1kW / 2kW / 5kW / 10kW multi-rating selector switchcombined (customizable up to 100kW+) | 1kW / 2kW / 5kW / 10kW multi-rating selector switchcombined (customizable up to 100kW+) | 1kW / 2kW / 5kW / 10kW multi-rating selector switchcombined (customizable up to 100kW+) | 1kW / 2kW / 5kW / 10kW multi-rating selector switchcombined (customizable up to 100kW+) | 1kW / 2kW / 5kW / 10kW multi-rating selector switchcombined (customizable up to 100kW+) |
| safeprotection | Over-temperatureauto-off + mushroomHeademergency stopbutton + audio-visual alarmprompting | Over-temperatureauto-off + mushroomHeademergency stopbutton + audio-visual alarmprompting | Over-temperatureauto-off + mushroomHeademergency stopbutton + audio-visual alarmprompting | Over-temperatureauto-off + mushroomHeademergency stopbutton + audio-visual alarmprompting | Over-temperatureauto-off + mushroomHeademergency stopbutton + audio-visual alarmprompting |
| controlSquareStyle | Front panel physical buttons + digitaldisplayInstruments + multi-rating selector switch | Front panel physical buttons + digitaldisplayInstruments + multi-rating selector switch | Front panel physical buttons + digitaldisplayInstruments + multi-rating selector switch | Front panel physical buttons + digitaldisplayInstruments + multi-rating selector switch | Front panel physical buttons + digitaldisplayInstruments + multi-rating selector switch |
| MobileSquareStyle | Bottom universal casters, SinglePersoncan berolledinto position | Bottom universal casters, SinglePersoncan berolledinto position | Bottom universal casters, SinglePersoncan berolledinto position | Bottom universal casters, SinglePersoncan berolledinto position | Bottom universal casters, SinglePersoncan berolledinto position |
| Applications | VFD braking · Battery discharge · PSU/UPS aging · Generator load testing · Laboratory | VFD braking · Battery discharge · PSU/UPS aging · Generator load testing · Laboratory | VFD braking · Battery discharge · PSU/UPS aging · Generator load testing · Laboratory | VFD braking · Battery discharge · PSU/UPS aging · Generator load testing · Laboratory | VFD braking · Battery discharge · PSU/UPS aging · Generator load testing · Laboratory |
| customization | Non-standard customization (power / voltage / resistance / comm. interface / cabinet dimensions) | Non-standard customization (power / voltage / resistance / comm. interface / cabinet dimensions) | Non-standard customization (power / voltage / resistance / comm. interface / cabinet dimensions) | Non-standard customization (power / voltage / resistance / comm. interface / cabinet dimensions) | Non-standard customization (power / voltage / resistance / comm. interface / cabinet dimensions) |
| Service & Support | Factory direct · Free 48h samples · Custom to drawing · 12-month warranty · Invoice supported | Factory direct · Free 48h samples · Custom to drawing · 12-month warranty · Invoice supported | Factory direct · Free 48h samples · Custom to drawing · 12-month warranty · Invoice supported | Factory direct · Free 48h samples · Custom to drawing · 12-month warranty · Invoice supported | Factory direct · Free 48h samples · Custom to drawing · 12-month warranty · Invoice supported |
| Core Highlights | — | — | — | — | — |
| Thermal design | — | — | — | — | — |
| outer enclosureProcess | — | — | — | — | — |
| Internal elements | — | — | — | — | — |
| Safety Label | — | — | — | — | — |
| Factory Test | — | — | — | — | — |
| View details | View details | View details | View details | View details | View details |
Frequently asked questions
What kW rating can your resistor cabinets and load banks reach?
Standard cabinet sizes go from 5 kW to 5 MW per unit, with multi-cabinet setups paralleled to 20 MW for grid-scale generator testing. Voltage classes 400 V, 690 V, 6.6 kV, 11 kV, 33 kV. Resistance values customized to your test profile (continuous, step-load, ramp). See /products/resistor-box for the standard size matrix.
What terminal types and connection options are available?
Cabinets ship with copper bus bars (M10/M12 stud) for permanent installation, or insulated Cam-Lok (J series, 400 A per phase) for portable test sets. Higher current available with double-bar configurations (1500 A continuous). Terminals are color-coded per IEC 60446 (brown/black/grey + green/yellow earth). Optional NEMA 3R weatherproof terminal box for outdoor use.
Are your resistor boxes rated for outdoor or marine environments?
Standard cabinet is IP23 (indoor protected). For outdoor use we offer IP54 louvered cabinets (rain and dust protected) and IP65 fully sealed with internal heat exchanger. Marine-grade option uses 316 stainless steel enclosure with epoxy-coated terminals, salt-spray tested per IEC 60068-2-52. Operating temperature −40°C to +55°C ambient; tropical (TH) coating optional.
Can resistor cabinets have multiple taps or programmable resistance steps?
Yes — common configurations include manual selector switches (5–10 fixed taps), motorized contactor banks (2–256 binary-coded steps via Modbus RTU or Ethernet/IP), and continuous variable via servo-driven slider. Decade-box style with 0.1 Ω resolution to 1 MΩ also available for laboratory metrology. Tell us your control interface and step resolution for a tailored quote.
What's the lead time for a fully custom resistor cabinet?
Typical lead time is 6–10 weeks: 1 week for engineering review and CAD approval, 4–6 weeks for sheet-metal fabrication, resistor element assembly and wiring, 1 week for high-pot, load test and burn-in, plus 1–2 weeks ocean freight. Rush builds (4 weeks) possible at premium for projects under 50 kW. Email info@resistor-factory.cn with single-line diagram and target delivery date for quote.
Sample Request
Sample Request
Standard samples are provided free of charge in reasonable quantities (shipped within 2–3 business days). Custom samples are delivered within 2–4 weeks. Please use the form on the right to tell us:
- Company and contact details
- Target part number or key specs (power / resistance / package)
- Application scenario and estimated annual volume
- Shipping address and expected delivery date
📧 You can also email us directly at info@resistor-factory.cn / 13650089870
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