Product Overview
The Vishay Sfernice RSSD series offers industrial high-power, vitreous tubular, adjustable wirewound resistors designed for demanding applications. These resistors are known for their ability to withstand heavy transient conditions, severe shock, and vibration. They are particularly useful for low ohmic value applications and can be tapped using adjustable collars for flexible resistance adjustment. Standard models feature a single adjustable collar.
Product Attributes
- Brand: Vishay Sfernice
- Material: WELDED STAINLESS STEEL 304 L COLLARS, SCREWED STAINLESS STEEL 304 L COLLARS
- Certifications: NF F 16101, 10/1988 and 16102, 04/1992 (Not applicable)
- Material Categorization: For definitions of compliance please see www.vishay.com/doc?99912
Technical Specifications
| Model Size | Resistance Range | Rated Power P25 C W | Tolerance % | Approx. Average Unit Weight (g) |
| RSSD 8 x 34 | 0.12 to 10 | 16 | 5, 10, 20 | 10 |
| RSSD 10 x 50 | 0.12 to 22 | 25 | 5, 10, 20 | 22 |
| RSSD 13 x 70 | 0.12 to 43 | 42 | 5, 10, 20 | 38 |
| RSSD 16 x 94 | 0.33 to 75 | 70 | 5, 10, 20 | 55 |
| RSSD 20 x 117 | 0.22 to 100 | 100 | 5, 10, 20 | 80 |
| RSSD 25 x 138 | 0.10 to 150 | 140 | 5, 10, 20 | 90 |
| RSSD 25 x 168 | 0.12 to 220 | 200 | 5, 10, 20 | 115 |
| RSSD 30 x 250 | 0.22 to 360 | 280 | 5, 10, 20 | 240 |
| RSSD 40 x 370 | 0.47 to 470 | 450 | 5, 10, 20 | 845 |
| RSSD 50 x 373 | 0.68 to 560 | 600 | 5, 10, 20 | 1270 |
Performance Tests
| Test | Conditions | Requirements | Typical Values and Drifts |
| Short Time Overload | 10 Pr during 5 s | 2 % | 1 % |
| Climatic Sequence | -55 C, +200 C 5 cycles | 3 % | 1 % |
| Thermal Shock | Load at 100 % Pr followed by cold -55 C / 15 | 2 % or 0.05 | 1 % |
| Load Life | 90 / 30 cycle 1000 h at Pr at +25 C | 5 % | 5 % |
Mechanical Specifications
- Mechanical Protection: Vishay Sfernice special cement
- Resistive Element: Nickel alloy wire
- Connections: AN collars, CS supporting collars
Environmental Specifications
- Temperature Range: -55 C, +450 C
- Climatic Category: -55 C / +200 C / 56 days
Additional Tappings
Tappings can be adjusted by Vishay Sfernice upon request. Advise ohmic values, tolerances of sections, and total Rn. Consult Vishay Sfernice for acceptable tolerance.
Recommendations for Use
Maximum Current Strength: Imax. = sqrt(POWER RATING / Rn)
Marking
Vishay Sfernice trademark, model, style, nominal resistance (in ), tolerance (in %), manufacturing date.
2412091029_VISHAY-RSSD40370C2R20KB02_C17692974.pdf
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