Description
VITROHM CRF253-4-5T-8R2 Fusible WW Resistor 2W 8R2
Features
| • Fusible resistors are triggered instantly on contact with mains voltage (230Veff), without flame or explosion. • The resistor wire is wound around a capped ceramic carrier and fused to the caps. • In case of vaporisation of the wire, a special varnish absorbs the metal vapour and prevents arcing and consequent short circuit. • The winding wire is dimensioned in such a way that, for all resistance values between 10R and 330R (100R for the 251-4 model), vaporisation occurs with mains voltage. • The resistor elements are encased in a silicon varnish and, in the classic sense, are not electrically insulated. • For resistance values under 10R as well as for other voltages, it has been ensured that the resistor is flame retardant. • The triggering function, however, has to be tested on an individual basis. |
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| Technical Specifications |
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| Resistance Tolerance: | ±5% |
| Power Rating (70°C): | |
| CRF253-4_: | 2,0W |
| CRF254-4_: | 2,5W |
| Operating Voltage, Max.: | (PxR)1/2 |
| Thermal Resistance: | |
| CRF253-4_: | 85K/W |
| CRF254-4_: | 65K/W |
| Insulation Resistance: | Not Insulated |
| Insulation Voltage (1Min.): | 75V |
| Temperature Coefficient: | +120 ±50×10-6/K |
| Temperature Range: | -55…+350°C |
| Climatic Category: | 55/350/56 |
| Failure Rate (Value Dependent): | Approx. 10×10-9 /h |
| Terminal Tensile Strength: | 50N |
| Solderability:1) | 2,5s |
| Derating: | Linear 70°C to 350°C (0W) |
| 1) Solderglobule Test, IEC60068-2-20 | |
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| Labelling |
| Manufacturer logo, series, resistance value, tolerance |
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| Terms of Delivery |
| Minimum order quantity: 1 PKU = 10 pieces Form of delivery: Taped |
Manufacturer:Vitrohm
Datasheet:vitrohm_series_crf_-_201501.pdf
