Description
Allen‑Bradley 81001‑956‑55-R is a heavy‑duty integrated snubber resistor assembly manufactured by Rockwell Automation, designed for high‑power DC drive, large motor control and industrial power conversion cabinets to absorb instantaneous voltage spikes, suppress switching surge and protect thyristor/SCR power bridge circuits from breakdown damage. This unit consists of seven independent wire‑wound power resistors integrated on a single metal cooling mounting frame, each rated 100W / 70Ω ±5% tolerance, with a total combined power dissipation of 700W. As an essential maintenance spare part for large DC variable speed drives, MCC motor control centers and rectifier excitation systems, the assembly adopts air‑cooled heat dissipation structure, built‑in insulation terminals and fixed mounting holes, widely deployed in metallurgical rolling mills, thermal power plant excitation racks, heavy machinery DC drive equipment and petrochemical high‑power motor control cabinets.
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- Brand: Allen‑Bradley (Rockwell Automation)
- Model PN: 81001‑956‑55-R
- Availability: Original factory sealed new stock, fully insulation & resistance tested refurbished assemblies available
- Delivery Time: 1–5 working days for in‑stock inventory; 6–10 weeks for factory backorder shipments
- Guarantee: 12‑month full warranty valid from shipment date
- Condition: Brand new unopened OEM / Fully cleaned, resistance calibrated and insulation withstand voltage tested refurbished
- Structure: 7pcs independent wire‑wound power resistors integrated assembly
- Single Resistor Spec: 100W rated power, 70 Ohm resistance, tolerance ±5%
- Total Combined Power Rating: 700W
- Cooling Method: Natural air convection metal frame heat dissipation
- Insulation Grade: High temperature resistant inorganic insulation coating
- Overall Net Weight: 1.43kg
- External Dimensions: 14in × 11in × 4.5in (356mm × 279mm × 114mm)
- Mounting: Standard fixed mounting holes for cabinet wall/drive rack installation
- Operating Ambient Temperature: -20°C ~ +65°C control cabinet environment
- Storage Temperature: -40°C ~ +85°C
- Humidity Resistance: 5%–90% RH non‑condensing
- Protection Grade: IP20 (indoor cabinet installation only, avoid direct liquid splashing)
- Application Matching: Large Allen‑Bradley DC drives, SCR rectifier excitation units, heavy motor MCC cabinets
Key Features & Advantages
- Seven independent 100W resistors integrated design with total 700W surge absorption capacity, effectively clamp high voltage spikes generated during SCR switching, avoid power device overvoltage breakdown and extend drive service life
- Thick metal cooling frame + wire‑wound high temperature resistant resistor core, stable long‑term heat dissipation under continuous heavy surge load, no overheating burnout risk in long‑cycle production
- Complete pre‑wired integrated assembly with unified mounting base, direct plug‑and‑play replacement without separate resistor combination wiring, greatly reducing on‑site maintenance wiring time
Industry Application Scenarios
- Metallurgical rolling mills: Main DC drive snubber protection for steel strip roughing & finishing mill SCR rectifier cabinets
- Thermal power generation: Generator static excitation system surge suppression spare parts for steam/gas turbine unit rectifier racks
- Heavy machinery manufacturing: Large DC motor variable speed drive cabinets for mine hoists, extruders and large conveyors
- Petrochemical industry: High‑power process pump & compressor motor control center (MCC) overvoltage protection assemblies
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